CHAPTER 1
Introduction

Cotton fibre is a vital natural resource that has shaped human civilization for thousands of years. As one of the most widely used fibres in the textile industry, cotton is prized for its unique combination of softness, breathability, and versatility. Derived from the cotton plant, particularly the genus Gossypium, this fibre is primarily composed of cellulose, which gives it strength and durability.

Cotton fibres are typically long and fine, allowing them to be spun into strong and durable yarns. The fibres are naturally twisted and often have a slight crimp, contributing to the texture and bulk of the final fabric. Because of its natural properties, cotton is comfortable against the skin and excels in moisture absorption, making it an ideal choice for clothing, bed linens, and various household textiles.

Beyond textiles, cotton plays a significant role in non-textile applications, including medical supplies and biodegradable materials. However, the production of cotton poses environmental challenges, such as high water usage and pesticide reliance. As a result, sustainable practices in cotton farming are becoming increasingly important to ensure the health of our planet.

In summary, cotton fibre is not just a material; it is a fundamental element of our daily lives, encompassing a rich history and a complex relationship with the environment. Understanding cotton's properties, uses, and the challenges it faces can foster greater appreciation for this remarkable fibre and its role in sustainability.

1.1 Cotton Quality

Cotton quality is determined by several factors, including fibre length, strength, fineness, color, and maturity. These attributes play a crucial role in the suitability of fibre for varied applications, particularly in the textile industry. Here's an overview of the key quality characteristics and the various types of cotton.

1.1.1 Key Quality Characteristics

This section enables the readers answer for "What? and Why?"

1. Fibre Length
Description: Longer fibres are generally stronger and produce smoother, more durable fabrics. Length is usually measured in inches or millimeters.
Importance: Longer fibres reduce the number of splices in yarn, enhancing the quality of the final fabric.

2. Fibre Strength
Description: This refers to the force required to break the fibre. Stronger fibres produce more robust textiles.
Importance: Higher strength cotton can withstand wear and tear better, making it ideal for heavy-duty applications.

3. Fineness
Description: The diameter of the fibre affects its softness and texture. Finer fibres create softer fabrics.
Importance: Finer cotton is often preferred for high-quality apparel due to its smooth and luxurious feel.

4. Color
Description: Cotton fibres range in color from white to off-white, with darker or stained fibres considered lower quality.
Importance: White cotton is often more desirable for dyeing and bleaching processes. Blue, brown and other color cotton is also grown naturally.

5. Maturity
Description: Mature fibres have higher cellulose content and lower moisture levels, contributing to strength and durability.
Importance: Properly matured cotton yields better quality fibre.

6. Trash Content
Description: Refers to the presence of foreign matter (e.g., leaves, seeds) mixed with the fibres.
Importance: Lower trash content is desirable for cleaner, higher-quality cotton.

1.1.2 Types of Cotton

The quality of cotton is determined by its intrinsic characteristics, each influencing its suitability for various applications. Types of cotton cater to diverse market needs, ranging from everyday apparel to luxury textiles.

1. Upland Cotton: Botanical Name: Gossypium hirsutum
Grown in – America, Asia and Australia.
Description: The most commonly grown cotton type, accounting for about 90% of global production.
Characteristics: Medium-length fibres; widely used for various textiles, including denim and T-shirts.

2. Pima Cotton: Botanical Name: Gossypium barbadense
Grown in: Peru, America and Australia, China and Israel.
Description: Known for its long, silky fibres and high quality.
Characteristics: Stronger and softer than Upland cotton; often used in luxury fabrics, bed linens, and high-end apparel.

3. Egyptian Cotton: Botanical Name: Gossypium barbadense
Grown in: Egypt especially in Nile River Delta.
Description: Similar to Pima, known for its long fibres and exceptional softness.
Characteristics: Highly regarded for luxury bed linens and towels; characterized by a high thread count.

4. Asiatic Cotton: Botanical Name: Gossypium arboreum
Grown in: India, Pakistan and China.
Description: Grown primarily in Asia; it has shorter fibres compared to Upland and Pima cotton.
Characteristics: Used in lower-end textiles and traditional fabrics.

5. Sea Iceland Cotton or common cotton grass: Botanical Name: Eriophorum angustifolium
Grown in: Iceland (Bogs, marshes, wetlands and wet meadows.
Description: A rare and high-quality cotton variety, known for its luster and strength.
Characteristics: Often used in premium fabrics and garments; has a very fine texture.

6. Organic Cotton:
Grown in: Subtropical regions of 22 countries across the globe (India, Turkiye, China, USA, Tanzania, Syria, Uganda and Egypt)
Description: Grown without synthetic pesticides or fertilizers; certified organic by various organizations.
Characteristics: Appeals to eco-conscious consumers; used in a wide range of products, including clothing and home textiles.

1.2 Cotton Cultivation

Cotton cultivation is a vital agricultural practice that provides one of the world's most important natural fibres. Known for its softness, breathability, and versatility, cotton is used extensively in the textile industry, making its cultivation economically significant for many countries. The process of growing cotton involves several key factors as follows:

1.2.1 Land Quality for Cotton Cultivation

1. Soil Type:
Well-Drained Soils: Cotton thrives in well-drained soils that promote healthy root development. Sandy loam and loamy soils are ideal as they provide good drainage and aeration while retaining sufficient moisture and nutrients.
Soil pH: The optimal soil pH for cotton is typically between 5.8 and 7.0. Soils outside this range can lead to nutrient deficiencies and adversely affect plant growth.

2. Nutrient Content:
Fertility Requirements: Cotton plants require a nutrient-rich environment, particularly nitrogen, phosphorus, and potassium. Soil testing and proper fertilization are essential for ensuring adequate nutrient levels to support healthy growth and yield.
Organic Matter: High organic matter content in the soil enhances fertility, moisture retention, and overall soil structure, contributing to better cotton production.

3. Water Availability:
Irrigation Needs: While cotton can grow in various climates, it requires consistent moisture during key growth stages. Access to irrigation can significantly improve yield potential, especially in regions where rainfall is insufficient.
Water Management: Efficient water management practices are crucial to prevent issues like water logging or drought stress, both of which can negatively impact crop quality and yield.

4. Topography:
Flat or Gently Sloping Land: Ideal cotton-growing areas typically have flat or gently sloping terrain, which facilitates easier planting, irrigation, and harvesting. Steep or rocky land can hinder these processes and lead to soil erosion.

1.2.2 Climate Consideration

Successful cotton cultivation hinges on the quality of land and environmental conditions. Understanding the specific requirements for soil type, nutrient content, water availability, and climate is essential for maximizing yields and ensuring high-quality fibre production. As global demand for cotton continues to grow, sustainable practices in land management and cultivation techniques will play a critical role in meeting this demand while protecting the environment.

Cotton is a warm-season crop that thrives in regions with:

• Warm Temperatures: Optimal growth occurs in temperatures between 70°F and 95°F (21°C − 35°C).
• Growing Season Length: A long frost-free growing season is crucial, as cotton requires about 150 to 180 days maturing.
• Cold regions like hill areas are not suitable for cotton cultivation.

1.2.3 Effect of varying pH of soil on Cotton Cultivation

The pH level of soil is a critical factor influencing the growth and yield of cotton plants. It affects nutrient availability, microbial activity, and overall soil health. Here's how varying pH levels impact cotton cultivation:

1. Optimal pH Range
Ideal pH: Cotton thrives best in slightly acidic to neutral soil, typically within a pH range of 5.8 to 7.0. Within this range, essential nutrients are most available, promoting healthy growth.

2. Effects of Low pH (Acidic Soils)
Nutrient Deficiency: In acidic soils (pH < 5.8), nutrients such as phosphorus, calcium, and magnesium become less available. This can lead to stunted growth and reduced yields.
Toxicity Risks: High levels of aluminum and manganese can become toxic to cotton plants in acidic conditions, negatively affecting root development and overall health.
Soil Microbial Activity: Acidic soils can disrupt beneficial microbial populations, affecting organic matter decomposition and nutrient cycling.

3. Effects of High pH (Alkaline Soils)
Nutrient Imbalance: In alkaline soils (pH > 7.0), essential nutrients like iron, zinc, and phosphorus may become less available, leading to deficiencies. Cotton plants may exhibit symptoms such as chlorosis (yellowing of leaves).
Reduced Growth: High pH can hinder root development and overall plant vigor, resulting in low yield and poorer quality.
Soil Structure: Alkaline soils may also lead to soil compaction, affecting water infiltration and root growth.

4. Soil Improvement and Management
Acidic Soils: To correct low pH, farmers can apply lime (Calcium Carbonate) to raise the pH. Soil testing helps determine the appropriate amount of lime needed.
Alkaline Soils: To lower pH in alkaline soils, amendments such as sulfur or organic matter can be applied. Adding compost or well-rotted manure can also improve soil structure and nutrient availability.

5. Impact on Yield and Quality
Yield Reduction: Suboptimal pH levels can lead to significant yield reductions, affecting both the quantity and quality of cotton fibre produced.
Fibre Quality: Nutrient deficiencies due to improper pH can affect fibre length, strength, and overall quality, which are critical factors for the textile industry.

1.2.4 Water Requirement for Quality Cotton Cultivation

Water is a critical factor in the successful cultivation of cotton. The water requirement for cotton plants can vary based on several factors, including climate, soil type, growth stage, and overall management practices. Here's an overview of the water needs for good-quality cotton cultivation and the effects of water availability:

1. Water Requirements:
General Needs: Cotton typically requires about 20 to 30 inches (500 − 750mm) of water during the growing season, depending on environmental conditions and moisture levels.
Growth Stages:
• Germination and Early Growth: Adequate moisture is crucial during germination and the early stages of growth to support seedling establishment.
• Flowering and Boll Development: Water demand peaks during flowering and boll formation, which are critical periods for determining yield and fibre quality.
• Maturation: Sufficient moisture is also important during maturation to allow bolls to fill properly.

2. Irrigation Practices
• Irrigation Methods: Depending on local conditions, various irrigation methods (drip, furrow, or sprinkler) may be used to provide consistent moisture and minimize water wastage.
• Soil Moisture Monitoring: Regular monitoring of soil moisture can help farmers make informed irrigation decisions to meet the plants' needs.

3. Effects of Water Availability
Water Stress
• Drought Conditions: Insufficient water during critical growth stages can lead to water stress, resulting in reduced yields and poor-quality fibre. Drought stress may cause early leaf drop, poor boll development, and smaller, lower-quality fibres.
• Physiological Responses: Water stress can trigger physiological responses in cotton plants, such as stomatal closure, which reduces photosynthesis and further hampers growth.

Over-watering
• Water logging: Excess water can lead to waterlogged conditions, resulting in poor root aeration and increased susceptibility to diseases such as root rot. This can adversely affect plant health and fibre yield.
• Nutrient Leaching: Over-watering can also lead to nutrient leaching from the soil, which may deprive cotton plants of essential nutrients, further impacting growth and fibre quality.

4. Impact on Fibre Quality
• Fibre Strength and Length: Proper water management is essential for producing high-quality cotton. Adequate moisture during critical growth periods promotes the development of longer, stronger fibres, which are highly valued in the textile industry.
• Uniformity: Consistent water supply helps ensure uniform growth and development, resulting in more uniform cotton bolls and higher-quality harvests.

1.2.5 Time Required for Cotton to Fully Mature: Stage-Wise breakdown

Cotton plants typically take about 150 to 180 days to reach full maturity, depending on the variety, environmental conditions, and management practices. Here's a stage-wise breakdown of the growth cycle:

1. Germination and Seedling Stage (Days 0−30)
• Duration: 5 to 10 days for germination; up to 30 days for the seedling stage.
• Key Activities:
   Seeds absorb water and swell, leading to germination.
   The first leaves (cotyledons) emerge, followed by true leaves.
   Strong root development is crucial for nutrient and water uptake.
• Requirements: Adequate moisture and warm temperatures (ideally between 60°F and 95°F or 16°C − 35°C) are essential for successful germination and establishment.

2. Vegetative Growth Stage (Days 30−60)
• Duration: Approximately 30 to 40 days.
• Key Activities:
   Rapid leaf development and height increase.
   Formation of the main stem and branches (or fruiting branches).
   The plant focuses on establishing a robust canopy for photosynthesis.
• Requirements: Consistent water supply, adequate nutrients (especially nitrogen), and optimal sunlight are helpful for healthy vegetative growth.

3. Flowering Stage (Days 60−90)
• Duration: Approximately 20 to 30 days.
• Key Activities:
   Flower buds (squares) develop, leading to blooming.
   Each flower blooms for about 24 hours before wilting, leading to the formation of bolls.
• Requirements: Water stress during this period can significantly affect flowering and boll development, so consistent moisture is crucial.

4. Boll Development Stage (Days 90−120)
• Duration: Approximately 30 to 40 days.
• Key Activities:
   Pollination occurs, followed by the development of bolls containing cotton fibres.
   Bolls mature and begin to swell, leading to fibre development inside.
• Requirements: Adequate water and nutrient supply are essential to ensure healthy boll growth and fibre quality.

5. Maturation Stage (Day 120−180)
• Duration: Approximately 30 to 60 days.
• Key Activities:
   Bolls ripen, and the fibres continue to develop and elongate.
   The plant starts to mature, with leaves beginning to yellow and drop.
   The bolls open to release the cotton fibres, indicating readiness for harvest.
• Requirements: During this stage, it's important to manage water levels to prevent excessive moisture, which can lead to issues like boll rot.

1.2.6 Impurities in Raw Cotton

Cotton fibres often contain various types of contaminants and impurities that can affect their quality, performance, and processing. Identifying and managing these impurities is crucial for producing high-quality cotton textiles. Here's an overview of common contaminants and impurities found in cotton fibre:

1. Natural Impurities
• Vegetative Matter: Leaves, stems, and other plant materials can be mixed with cotton during harvesting. This vegetative matter can affect the appearance and dyeing of the final product.
• Seed Fragments: Residual seed fibres, or linters, can remain attached to the cotton bolls and need to be removed during processing. These can affect the cleanliness and quality of the yarn.

2. Soil and Dust
• Soil Particles: Dust and soil can adhere to cotton fibres during cultivation and harvesting. This contamination can lead to processing issues and reduce the overall quality of the fabric.

3. Insect Contaminants
• Boll Weevil and Other Insects: Insects such as the boll weevil and aphids can leave behind feces or body parts in cotton bales, which may lead to contamination and affect the cleanliness of the fibres.

4. Chemical Residues
• Pesticides and Herbicides: Chemicals used in cotton cultivation to control pests and weeds can remain on the fibres, potentially affecting safety and sustainability. Proper washing and processing are necessary to minimize these residues.
• Fertilizer Residues: Chemical fertilizers can leave residues on cotton fibres, influencing dye uptake and overall fabric quality.

5. Dirt and Grime
• General Soil Contamination: Cotton fibres can accumulate dirt and grime during handling and transportation, impacting their appearance and performance.

(A) Impact of Contamination

• Quality Degradation: Contaminants can weaken the fibres, reduce their tensile strength, and lead to defects in the finished fabric, such as uneven dyeing or texture issues.
• Processing Challenges: Impurities can cause problems during spinning, weaving, and dyeing, leading to increased production costs and lower efficiency.

(B) Mitigation Strategies

• Cleaning Processes: Effective cleaning methods, such as ginning and scouring, help remove impurities before the fibres are processed into yarn and fabric.
• Quality Control: Implementing quality control measures during harvesting and processing can help minimize contamination and ensure high-quality cotton.

1.2.7 Major Cotton Producing States in India

India is one of the largest producers of cotton across the globe, with several states contributing significantly to its cultivation. Here's an overview of the major cotton-producing states in India along with their estimated production volumes:

1. Gujarat
Production Volume: Approximately 10.5 million bales (170 kg each) per year.
Key Features: Gujarat is the leading cotton-producing state, known for its high-quality cotton varieties and advanced irrigation practices.

2. Maharashtra
Production Volume: Approximately 8.5 million bales per year.
Key Features: This state has diverse cotton-growing regions, with both hybrid and traditional varieties being cultivated.

3. Telangana
Production Volume: Approximately 7.0 million bales per year.
Key Features: Known for its high-yielding varieties, Telangana has rapidly increased its cotton production in recent years.

4. Andhra Pradesh
Production Volume: Approximately 5.0 million bales per year.
Key Features: The state has been promoting improved seed varieties and irrigation techniques to enhance cotton production.

5. Punjab
Production Volume: Approximately 2.5 million bales per year.
Key Features: Punjab focuses on high-quality cotton and employs modern farming techniques.

6. Haryana
Production Volume: Approximately 2.0 million bales per year.
Key Features: Punjab, Haryana has a focus on high-yield varieties and efficient farming practices.

7. Rajasthan
Production Volume: Approximately 1.5 million bales per year.
Key Features: Cotton is primarily grown in the arid regions of Rajasthan, with specific adaptations for water management. South-West Rajasthan is also engaged in cotton production.

8. Madhya Pradesh
Production Volume: Approximately 1.5 million bales per year.
Key Features: The state is increasingly adopting cotton cultivation, with a focus on sustainable practices.

1.2.8 Major Cotton Producing Countries

Based on Cotton Production Data 2024-25.

1. China
Production Volume: Approximately 6.8 million metric tons (around 32 million bales)
Key Features: China is the largest producer of cotton, focusing on high-quality fibres and modern farming techniques.

2. India
Production Volume: About 6 million metric tons (around 24 million bales).
Key Features: India ranks second globally and has a diverse range of cotton varieties, with significant contributions from states like Gujarat and Maharashtra.

3. Brazil
Production Volume: Approximately 3.0 million metric tons (around 17 million bales)
Key Features: Brazil has rapidly increased its cotton production, focusing on both quantity and quality.

4. United States of America
Production Volume: Approximately 3.5 million metric tons (around 16 million bales)
Key Features: The USA is known for its high-yielding and high-quality cotton varieties, primarily grown in states like Texas and California.

5. Australia
Production Volume: About 0.6 million metric tons (around 2.7 million bales)
Key Features: Australian cotton is known for its high quality, primarily grown in Queensland and New South Wales.

6. Pakistan
Production Volume: About 1.8 million metric tons (around 8.2 million bales)
Key Features: Cotton is a major cash crop in Pakistan, essential for its textile industry.

7. Turkiye
Production Volume: About 1.1 million metric tons (around 5.0 million bales)
Key Features: Turkey has a strong domestic textile industry, supporting its cotton cultivation.

8. Uzbekistan
Production Volume: Approximately 3.0 million metric tons (around 4.6 million bales)
Key Features: Cotton is a crucial part of Uzbekistan's economy, often referred to as "white gold".

9. Argentina
Production Volume: Approximately 1.3 million metric tons (around 4.6 million bales)
Key Features: Cotton is an important part of its economy.

10. Benin
Production Volume: Approximately 1.3 million metric tons (around 4.5 million bales)
Key Features: Cotton is an important part of its economy.

List of 15 major cotton-producing countries:

S. N	Name	Production Volume in Million Bales	Global Share
1.	China	32	26.7%
2.	India	24	20%
3.	Brazil	17	14.2%
4.	United States of America	3.5	12%
5.	Australia	5.6	4.7%
6.	Pakistan	5.0	4.2%
7.	Turkiye	4.0	3.3%
8.	Uzbekistan	3.0	2.5%
9.	Argentina	1.3	1.1%
10.	Benin	1.3	1.1%
11.	Mali	1.1	0.9%
12.	Mexico	0.9	0.8%
13.	Turkmenistan	0.8	0.7%
14.	Cameroon	0.68	0.6%
15.	Burkina Faso	0.60	0.5%

Table 1.1: Major Cotton Producing Countries [Source: www.worldpopulationreview.com]

Illustrative Questions and Answers

Practice Questions

1. What is cotton?
2. What are the key quality characteristics of cotton?
3. What is the importance of quality characteristics of cotton?
4. What are various types of cotton?
5. List or name the best three types of cotton.
6. How is the cultivation of cotton affected by quality of land?
7. Enumerate the nutrients required in the soil for good yield.
8. Why are the Middle East and European countries not able to produce cotton?
9. How does the soil pH play an important role in cotton cultivation?
10. Write the stage-wise breakdown of time required for cotton to get matured?

CHAPTER 2
Structure of Cotton Fibre

The structure of cotton fibre is complex and hierarchical, comprising multiple layers that contribute to its unique properties. Understanding this structure is fundamental to appreciating cotton's behavior in textile processes and its suitability for various applications.

2.1 Parts of Cotton Fibre - Physical Structure

A single cotton fibre, also known as a trichome, is a single cell that grows from the epidermis of the cotton seed. It consists of several distinct layers, each with specific characteristics and functions.

1. Cuticle:
• The outermost layer of the cotton fibre.
• Composed of waxes, pectins, and proteins.
• Provides a protective barrier against environmental factors.
• Influences dye uptake and moisture absorption.

2. Primary Wall:
• Located beneath the cuticle.
• Composed of cellulose microfibrils arranged in a random network.
• Determines the initial shape and diameter of the fibre.
• Relatively thin compared to other layers.

3. Secondary Wall:
• The thickest layer, comprising about 90% of the fibre's weight.
• Made of concentric layers of cellulose microfibrils.
• Microfibrils are arranged in a spiral pattern, creating the characteristic twist (convolutions) of cotton fibres.
• Responsible for the fibre's strength and durability.

4. Lumen:
• The central hollow canal running through the length of the fibre.
• Contains remnants of protoplasm and air.
• Size varies with fibre maturity; immature fibres have larger lumens.
• Affects dyeing properties and moisture transport.

CHAPTER 3
Physical Properties

The physical properties of cotton fibres significantly influence their processing behavior and the quality of the final textile products. These properties include dimensions, surface characteristics, and bulk properties that determine how cotton behaves during spinning, weaving, knitting, and finishing operations.

3.1 Physical Properties of Cotton Fibre

1. Length:
• Range: Typically 10-50 mm, varying by cotton type.
• Importance: Longer fibres produce stronger, more even yarns with fewer imperfections.
• Measurement: Determined by staple length classification (short, medium, long, extra-long).

2. Fineness (Linear Density):
• Definition: Mass per unit length, usually expressed in micrograms per inch or millitex.
• Range: 1.0-4.0 μg/inch (approximately 0.15-0.60 dtex).
• Importance: Finer fibres produce softer, more lustrous fabrics with better drape.
• Measurement: Micronaire value indicates fineness and maturity.

3. Strength:
• Definition: Force required to break a fibre.
• Range: 3.0-5.0 grams per tex.
• Importance: Higher strength enables production of finer yarns and improves processing efficiency.
• Factors: Affected by cellulose polymerization degree and fibre structure integrity.

4. Maturity:
• Definition: Degree of secondary wall development relative to fibre diameter.
• Classification: Immature, mature, and dead fibres.
• Importance: Mature fibres have better strength, dye uptake, and processing characteristics.
• Measurement: Determined by alkali swelling tests or polarized light microscopy.

CHAPTER 4
Mechanical Properties

The mechanical properties of cotton fibres determine their behavior under various forces during textile processing and end-use. These properties are crucial for predicting fabric performance, durability, and comfort.

4.1 Mechanical Properties of Cotton Fibre

1. Tensile Properties:
• Tenacity: Specific strength, typically 3.0-5.0 g/tex.
• Breaking Extension: 5-10%, relatively low compared to synthetic fibres.
• Initial Modulus: High, indicating stiffness at low extensions.
• Work of Rupture: Energy required to break the fibre, moderate values.

2. Elastic Properties:
• Elastic Recovery: Approximately 75% recovery from 2% extension.
• Creep: Time-dependent deformation under constant load.
• Stress Relaxation: Decrease in stress under constant strain.
• Hysteresis: Energy loss during loading-unloading cycles.

3. Bending Properties:
• Flexural Rigidity: Resistance to bending, relatively high due to fibre structure.
• Bending Recovery: Ability to recover from bending deformation.
• Drape: Influenced by bending properties, affects fabric hand and appearance.

4. Torsional Properties:
• Torsional Rigidity: Resistance to twisting, important during yarn formation.
• Twist Retention: Ability to maintain inserted twist.
• Torque Balance: Critical for yarn stability and fabric skew prevention.

CHAPTER 5
Chemical Properties

Cotton is primarily composed of cellulose, a natural polymer that determines most of its chemical properties. Understanding these properties is essential for processing, dyeing, finishing, and care of cotton textiles.

5.1 Chemical Properties of Cotton Fibre

1. Chemical Composition:
• Cellulose: 88-96% of dry weight, β-D-glucose units linked by 1,4-glycosidic bonds.
• Non-cellulosic Components:
   - Proteins: 1.0-1.5%
   - Pectins: 0.7-1.2%
   - Waxes: 0.4-1.0%
   - Ash: 0.7-1.5%
   - Others: Organic acids, sugars, pigments

2. Reactivity:
• Hydroxyl Groups: Three per glucose unit (one primary, two secondary).
• Esterification: Forms cellulose esters (acetate, nitrate).
• Etherification: Forms cellulose ethers (methyl, carboxymethyl).
• Oxidation: Controlled oxidation modifies properties for specific applications.

3. Degradation Reactions:
• Acidic Hydrolysis: Glycosidic bond cleavage, reduces DP and strength.
• Alkaline Degradation: Peeling reaction at reducing ends.
• Oxidative Degradation: By oxidizing agents, sunlight, or atmospheric oxygen.
• Enzymatic Degradation: By cellulase enzymes.