Why is acrylic yarn more durable than viscose?

In the field of textile materials, acrylic fiber and viscose are two common fiber raw materials, each with unique properties and uses. However, from the perspective of durability and durability, acrylic yarn typically exhibits better performance than viscose. This phenomenon involves multiple factors, including the chemical structure, physical properties, production process, and resistance to environmental factors of fibers. This article will delve into the reasons why acrylic yarn is more durable than viscose, and conduct a comprehensive analysis from molecular structure to practical application effects.

2、 Comparison of basic characteristics of fibers

1. Basic characteristics of acrylic fiber

Acrylic fiber, also known as polyacrylonitrile fiber, is a synthetic fiber made by polymerizing acrylonitrile monomer. Its main features include:

High strength: higher fracture strength than many natural fibers

Excellent elastic recovery rate

Good light resistance and weather resistance

Good wrinkle resistance

Excellent chemical resistance

2. Basic characteristics of adhesive fibers

Viscose fiber belongs to regenerated cellulose fibers, which are made from natural cellulose (such as wood pulp and cotton short fibers) through chemical treatment. Its characteristics include:

Good moisture absorption, comfortable to wear

Soft to the touch and good drape

Excellent dyeing performance

But the wet strength is significantly lower than the dry strength

Easy to wrinkle, poor dimensional stability

3、 Differences in durability caused by differences in molecular structure

1. Molecular structure advantages of acrylic fiber

The molecular chain of acrylic fiber contains highly polar cyanide groups (- C ≡ N), which can form strong dipole dipole interactions between these groups, enhancing the intermolecular forces. At the same time, the acrylic polymer chains have a serrated configuration, a regular structure, and a high crystallinity (about 50-60%). This tight molecular arrangement makes acrylic fibers:

Has high mechanical strength (dry strength 3.5-5.3 cN/dtex)

Excellent elastic recovery ability (rebound rate can reach over 90%)

Strong anti deformation ability, not easily deformed by external forces

2. Molecular structure limitations of adhesives

Although viscose fibers are also composed of cellulose macromolecules, their degree of polymerization (about 250-500) is much lower than natural cotton fibers (about 10000-15000), and the arrangement of molecular chains is not as regular as acrylic fibers. The crystallinity of viscose fiber is about 40%, which is lower than that of acrylic fiber. This structural characteristic leads to:

The number of hydrogen bonds between molecular chains is relatively small, and the interaction force is weak

Hydrogen bonds are easily disrupted in wet conditions, resulting in a significant decrease in strength (wet strength is only 40-60% of dry strength)

Poor elasticity recovery, prone to wrinkling

4、 Comparison of Physical and Mechanical Properties

1. Fracture strength and elongation

The fracture strength of acrylic fiber is significantly higher than that of viscose fiber:

Acrylic fiber: 3.5-5.3 cN/dtex (dry), with little change in wet strength

Adhesive: 2.2-2.7 cN/dtex (dry state), reduced to 0.8-1.8 cN/dtex in wet state

This strength difference directly affects the durability of the fabric, especially in humid environments such as washing, where adhesive products are more susceptible to damage.

2. Wear resistance performance

The wear resistance of acrylic fiber is much better than that of adhesive:

The wear resistance of acrylic fiber can reach over 10000 times (under standard testing conditions)

The wear resistance of adhesive is usually only 2000-3000 times

This is mainly attributed to the high elasticity and high recovery of acrylic fiber, which enables it to better disperse stress during friction and avoid fiber breakage.

3. Wrinkle resistance and dimensional stability

The initial modulus of acrylic fiber is relatively high (35-75cN/dtex), much higher than that of viscose fiber (50-100cN/dtex, but significantly reduced in wet state). This makes:

Acrylic fabric is not prone to wrinkling and has good retention

Low shrinkage rate after washing (about 1-2%)

Adhesive fabrics are prone to wrinkling and have significant shrinkage after washing (up to 5-10%)

5、 Differences in environmental stability

1. Light resistance and weather resistance

The cyanide group of acrylic fiber can effectively absorb ultraviolet light and convert it into heat energy for emission, thus it has good light resistance:

After 1000 hours of exposure to sunlight, the intensity only lost 20%

And under the same conditions, the strength loss of adhesive can reach 40-50%

This makes acrylic products less prone to aging and fading when used outdoors.

2. Chemical resistance performance

Acrylic fiber has good resistance to most chemicals:

Excellent acid and alkali resistance (except for strong oxidizing acids)

No mold, no decay

Adhesive is susceptible to acid and alkali corrosion, especially in wet conditions where it is more sensitive

3. Moisture and heat resistance

In humid and hot environments:

The mechanical properties of acrylic fiber change very little

Adhesive is prone to swelling, decreased strength, and can easily breed microorganisms

6、 The impact of production processes

1. Production advantages of acrylic fiber

Acrylic fiber is produced by solution spinning method, and by precisely controlling the process parameters, the following can be obtained:

Regular cross-sectional shape (circular or dumbbell shaped)

Smooth surface, low friction coefficient

Uniform fineness and few defects

These characteristics all contribute to improving the uniformity and durability of the yarn.

2. Production limitations of adhesive

Adhesive production requires complex processes such as alkalization, aging, yellowing, etc., which can easily cause:

The fiber cross-section is irregularly serrated

There are longitudinal grooves on the surface, which are prone to accumulating dirt and grime

Weak links are prone to occur when the process fluctuates greatly

7、 Actual application performance

1. Performance retention after repeated washing

After 50 standard washes:

Strength retention rate of acrylic fabric>90%

The strength retention rate of adhesive fabric is only 60-70%

2. Durability during wearing

In actual wear, acrylic products exhibit:

Longer service life (usually 2-3 times longer than adhesive)

Less pilling phenomenon

Better appearance retention

8、 Conclusion

Based on the above analysis, the main reasons why acrylic yarn is more durable than viscose can be summarized as follows:

The molecular structure is more compact and the crystallinity is higher, endowing it with excellent mechanical properties

More stable physical performance, especially with less strength loss in wet environments

The key durability indicators such as wear resistance and elastic recovery are significantly better than adhesives

Stronger resistance to environmental factors such as light, heat, chemicals, etc

The production process is more controllable, and the fiber quality is more uniform

Although viscose fibers have advantages in moisture absorption, breathability, and comfortable hand feel, acrylic fibers are undoubtedly a better choice in applications that require high durability. With the advancement of spinning technology, the performance of modern acrylic fibers continues to improve, further consolidating their position in the field of durable textiles.