Nylon is an important synthetic material for industrial purpose. It has many variants like Nylon 66, Nylon 6, Nylon 5,10, Nylon 6,12, Nylon 11 etc. What to choose, a little bit confusing right?
Find out the differences between Nylon 6 and Nylon 66 right below!!
You will get to know about nylon 6, nylon 66 along with their application area in brief in this article.
For High mechanical damping ability, good sliding properties, excellent wear resistance, good electrical insulating properties, and good resistance to high energy radiation Nylon becomes incredibly popular for different industrial purposes.
Basically main difference between Nylon 6 and Nylon 66 is in their chemical structure. Both of them are popular for their durability and light weight properties. Nylon 6 is formed from Caprolactum by open ring polymerization having lower melting point.
Whereas, Nylon 66 is formed from Hexa methylene di-ammine and Adipic acid by condensation polymerization reaction having a higher melting point. The latter property makes it suitable for high performance industrial use.
Nylon 6 results from open ring polymerization of only one monomer caprolactam. It is called Nylon 6 because of containg 6 carbon atioms in it. This is made from the type ………AAAAAA……… or (A)n, where n=200.
It provides good insulation and damping properties. Toughness, stiffness and hardness all of them are the characteristics of nylon 6. It has lustrous finish along with it exhibits good dye affinity.
Heavy duty fabric
Nylon 66 is a polymer formed from condensation polymerization of Hexa methylene di-ammine and adipic acid. It contains 12 carbon atoms that comes from its two monomers. As each of them has 6 carbon atoms in their structure.
Its micro denier form is mostly used in apparel such as industrial workwear. Heavy denier is used in-
Automotive air bags
Let’s have a general discussion on the properties of Nylon 6 and Nylon 66……
The numbers of repeat units along the polymer chains of nylon 6.6 and nylon 6 are about 65 and 130, respectively. Both types of nylon contain weakly basic amino and weakly acidic carboxylic acid end groups.
Nylon 6 and nylon 6.6 are strong fibers with moderate elasticity, even after drawing. Nylon 6 has a somewhat lower elastic modulus and better elastic recovery than nylon 6.6 and therefore gives more flexible fabrics of softer handle.
Both nylons are available in high tenacity variations for industrial uses. In fact, the mechanical properties can be varied considerably by changes in the polymerization and drawing conditions.
Heat setting of nylon materials may be carried out under dry conditions in hot air at 190 °C for nylon 6, or 205 °C for nylon 6.6. Alternatively, setting is achieved in steam at 120 or 135 °C, respectively.
At higher temperature like 180°C, Nylon 66 shows better heat age strength of 11.5 kg whereas Nylon 6 breaks down at 2.5 kg. The fibers of Nylon 66 are 33% more resistant to abrasion than Nylon 6. They can withstand 60,000 cycles while Nylon 6 can withstand 40,000 cycles at the same conditions.
Low creep, more crystalinity makes it slightly stiffer and better equipped, again its good stretch recovery, and higher abrasion resistance makes Nylon 66 more suitable for industrial use.
As Nylon 6 is a bit lustrous than Nylon 66, it is suitable for radiator grilles, stadium seats or firearm components where we need an attractive lustrous finish.
Take a quick glance of the differences between Nylon 6 and Nylon 66
No. of carbon atoms in structure
No of carbon atoms are 6. It represents that it has 6 carbon atoms in the backbone of its chain
Nylon 66 has two 6 numbers. It indicates the number of carbons in the acid and ammine residues. So it has 12 carbon atoms.
Requirement of monomer
Only one monomer is required
Two monomers are required
Hexa-mythelene di-amine and Adipic acid
It is known as poly-caprolactam which is formed by open ring polymerization
This polyamide is formed by condensation polymerization
Salma Hasin Shila, the author of this site completed her BSc. in Textile Engineering (Wet Processing Engineering) from Bangladesh University of Textiles www.butex.edu.bd (BUTEX). She has a passion for textile technology and love to write about it. She wants to share her knowledge to help the students in their studies and businessman & entrepreneurs in their business in making wise decisions fast.