difference between nylon 6 and nylon 6 6

 nylon 6,6 is copolymer of hexamethylenediammine and adipic acid.

but nylon 6 is a homopolymer of caprolactum

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Nylon 6,6 and Nylon 6 are the most versatile commercial nylon products in the market having a vast range of uses depending upon the need.

Both the products are used for engineering applications though Nylon 6,6 is more used for its ductility and tensile strength. Nylon-6,6 which is also known as Polyamide 6,6.is the semi-crystalline polyamide commonly used in fiber applications such as carpeting, clothing, and tire cords.

Nylon 6 which is also known as Poly-caprolactum has many individual uses. The numerical nomenclature for nylon is derived from the number of carbon atoms in the diamine and dibasic acid monomers used to manufacture it. The ratio of carbon atoms is what gives each nylon type its unique property characteristics.

Nylon 6 is used more for products like Bristles for toothbrushes, sutures for surgery, manufacture of hosiery, knitted garments. Also recently there had been more products developed using Nylon 6 which includes large variety of threads, ropes, filaments, nets, and tire cords.

Nylon 6,6 has a tighter molecular structure than nylon 6 due to a higher level of hydrogen bonding and maximum alignment between molecular chains, creating a tighter structure that better resists crushing, matting and stain penetration. Nylon 6 does not have this level of internal bonding, resulting in a more open structure. Nylon 6,6 gives carpet the unique balance of strength, elasticity and durability it needs to survive in commercial installations.
The stiffness of nylon 6/6 can be improved up to 10 times. The use of internal lubricants improves on the already excellent wear resistance and friction properties on nylon 6/6. Its versatility allows it to be used in almost any application that requires high physical strength, ductility, heat resistance and chemical resistance.

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Difference Between Nylon 6 & Nylon 66 Difference Between Nylon 6 & Nylon 66thumbnail

Created in 1930 by Wallace Hume Caruthers, Nylon is used for a variety of products because of its heat resistance and toughness at both high and low temperatures. However, both Nylon 6 and Nylon 6,6 (also called Nylon 6-6) differ in their uses and chemical properties, making each Nylon suitable for certain industries and products.

 
 
  1. Chemical Compound

    • Both Nylon 6 and Nylon 6,6's polyamide chains are held together using hydrogen bonds, adding to the strength and dexterity of the fibers. Nylon 6's crystal structure contains parallel chains with hydrogen bonds between each chain, forming a more open structure with less internal hydrogen bonding. Compared to Nylon 6's crystal structure, Nylon 6,6 is tighter with less openings, making it the stronger and more resistant to heat of the two Nylons. Since Nylon 6,6's structure contains no set direction it makes the surface 12 percent harder and 20 percent more resilient than Nylon 6.

    Differences in Properties

    • Both Nylon 6,6 and Nylon 6 are 100 percent elastic while under an 8 percent extension. However, both differ in their melting points, with Nylon 6 melting at 216 degrees Celsius and Nylon 6,6 having a melting point of 263 degrees Celsius. This makes Nylon 6,6 the preferred Nylon for temperature performance products. Both Nylon 6 and 6,6 allow easy dyeing and washing and both provide a chemically stable product.

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    Preferred Products

    • Each Nylon is preferred over the other in certain cases due to physical properties. For example, Nylon 6,6 is preferred over 6 for making carpets because of its higher strength and toughness. Nylon 6 is primarily used in the textile industry for making clothing, ropes, threads, nets and garments while Nylon 6,6 is used for tire ropes, gear wheels, friction bearings and plug parts.

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ain't this quite lengthy..??..:P 

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Thanks Suneha for saying wht i wished to

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Yes Varadhan is right!

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Thanks Vardhan

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@ varadhan...gud yrr...very short and exact...
@hunney...sorry but here we want short but precise answers...copying things frm wikipedia or sumthng does not solve the purpose..moreover..anyone can do that...ehh..well don't mind..;)

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nylon 6 contains only caprolactum units which on self condensation gives a unit 6 carbon .nylon 6-6 contains adipic acid which contains 6 carbon atom and hexamethylelene diamine which also has 6 carbon.there is a trick through which we can name a polyamide polymer.first we count no. of carbon in organic acid as x and y carbon atom of amines.thus we can name it as nylon x,y

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Nylon 6 has only one monomer containg 6 carbon while Nylon 6,6 has two monomer both having 6, 6 carbons

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