Physical Properties of Nylon

Nylon:

Nylon was the first synthetic fibre to go into full-scale production and the only one to do so prior to World War II. Nylon fibres are made up of linear macromolecules whose structural units are linked by the –NH–CO– group. Nylon is one of the most commonly used polymers.

Nylon fiber

Nylon polymers can be formed in many ways. The four most important for industrial polymers are:

1. The condensation of diamines with diacids;
2. The self-condensation of amino acids;
3. The hydrolytic polymerisation of lactams, which involves partial hydrolysis of the lactam to an amino acid; and
4. The anhydrous addition polymerisation of lactams.

Characteristics of Nylon Fiber :

1. Expetionally strong
2. Elastic.
3. Abration resistance
4. Luster
5. Easy to wash
6. Dyed in wide range of colour
7. Low in moisture absorbancy
8. Filamert yarn provides smooth, soft, long fabric
9. Spun yarn fabric give light weight and warmth
10. Resilient
11. Resistance to damage oil and many ressitance ( acid & alkali)

Physical Properties of Nylon 6 & Nylon 6,6: 1. Melting point : 

• Nylon6 : 215-218c
• Nylon 6,6: 250c

2. Sticking point : 

• Nylon 6: 217c
• Nylon 6,6 : 229c

3. Heat setting : 

• Nylon6: 205c
• Nylon 6,6: 150c

4. Safe ironing temp. : 

• Nylon 6 : 149c
• Nylon 6,6 :190c

5. Action of water : 
In standerd condiation Nylon 65% RH in 25c+2 temarature.

6. Action of light: 
Light wave length is 300-700mm of the nylon fibre.

7. Action of Acid: 
In conc. H2SO4 nylon6 & nylon66 is unstable and dilute is unstable.

8. Action of alkali: 
In alkali highly resistance 10% NaOH in 85% at 10 hr treatment. 

 
Comparison between Nylon 6 & Nylon 6,6:

Topics	Nylon 6	Nylon 6,6
1. Chemical composition
2. Crystallinity	less crystalline than nylon66	More crystalline than nylon 6
3. Melting point	215c	250c
4. Tg	40	47-57
5. Molecular mobility	high	low
6. Colour fastness	high	low
7. Stain cleanability	low	high
8. Temprature resistance	lower	higher
9. Regilience	low	high
10. Moisture regain	4.5	4-4.5

   

Different between Nylon 6 & Nylon 6,6: 
Nylon 6 is made from one component namely Caprolactum, which has six carbon atom , while Nylon 66 is made from two component s namely adipic acid and hexamethylene diamine each monomer has six carbon atoms.