What are the properties of nylon?Please explain why its melting point is low and also about the monomers which make up nylon.

The latest branch of chemical fibers that developed in the last 40 years in an extraordinary pace is a synthetic fiber. These fibers are the result of development of one of the most modern branches of chemistry: the chemistry of polymers. Their synthesis was possible only when research showed the characteristics required of a polymer reliable: to be filiform (no branching or crosslinked of chains) have a suitable molecular weight, can be oriented and crystallized, to be soluble in solvents or melts without decomposition.
           Synthetic fibers have some properties superior to those natural including: high strength, excellent chemical resistance, resistance to moth and decay. Synthetic fibers can give them properties which they do not have those natural: non flammability, resistance to high temperatures, etc.. There are some unsatisfactory properties: low moisture absorption, high electrostatic charge, pilling effects,  color more difficult.
With the appearance of new types of synthetic fibers, to spinning processes known they have been added new ones: the melt spinning and, more recently, spinning the suspension, the semi melt spinning, etc..
           In general, the scheme for obtaining a synthetic fiber is:
preparation of polymer -> spinning -> yarn drawing 
->wrinkling -> fixing.

The last time, is widely used and spinning co. Co spun fibers have two structures: "shell-core" and "side by side "        Skin-core fibers have a core of a polymer fiber that gives strength, elasticity, etc.., and a shell of another polymer for the lower static loading, increase gloss, reduce pilling etc.
           Structure side by side may, for example, to give a large wrinklingto  fiber if the two polymers have different contractions.
Nylon:
 
           These fibers are used for obtaining molded articles, textiles and medical sutures. Nylon fibers are resilient and more resistant than silk and relatively insensitive to moisture and mildew.
           Nylon is a polyamide obtained from petroleum. Nylon is melting and then burns rapidly if the flame remains on fused fiber. If you can keep the flame on burning nylon,it feels a burning plastic smell.