Polycaproamide Nylon

Melting behaviour and spherulitic crystallization of polycaproamid (nylon 6). Polymer 3, 43—51 (1962). 

Nylon. Nylon fibers are made predominantly from either poly(hexa-methylene adipamide) (nylon 66) or polycaproamide (nylon 6). In... 

Application Uhde Inventa-Fischer s VK-tube process polymerizes s-cap-rolactam (LC) monomer to produce polycaproamide (nylon-6) chips. 

A few cases of prevailing polycondensation. Rec. Trav. Chim. 7,277 (1952). Macchi, E. M., N. MorGsoff, and H. Morawetz Polymerization in the solid state. X. The solid state conversion of 6-aminocaproic acid into oriented nylon 6. J. Polymer Sci., to be publi ed — Morosoff, N., D. Lim, and H. Morawetz Preparation of biaxially oriented polycaproamide by the solid state polycondensation of e-aminocaproic acid. J. Am. Chem. Soc. 86, 3167 (1964). 

Figure 30 shows how the number of microvoids increased with time under load in a PVC film, though a simflar behaviour was found in oriented polycaproamide (nylon 6). The initial rate of formation of voids, dNjdt was logarithmic with tensile stress. A further important observation was that the critical concentration of cavities just before macroscopic failure appeared to be constant for specimens whose lifetimes under load varied over four decades of time (accordii to the applied load). This is shown in Fig. 31. The same critical concentration of microvoids was found close to the tip of a propagating crack.

Polycaproamide via caprolactam, which is derived from phenol or benzene (Nylon 6). 

Although there are clear lUPAC rules for naming the polymers, in practice various names for the same polymer are frequently encountered. As an example, a simple polymer such as nylon 6 (commercial name) can be named poly(e-caprolactam), poly[imino(1-0X0-1,6-hexandiyl)], poly(6-aminohexanoic acid), polycaproamide or poly(pentamethylenecarbonamide). 

Reprinted by permission of John Wiley Sons, Inc. from Holmes, D. R., Bunn, C. W. and Smith, D. J. The crystal structure of polycaproamide nylon 6 , J. Polymer Sci. 17, 159 (1955). Copyright 1955 John Wiley Sons, Inc. 

The numerical values in parentheses are the experimental values ° of Cj and hg (from Cj). N6 polycaproamide (nylon-6), N66 poly(hexamethylene adipamide) (nylon-6,6), iPP isotactic polypropylene, iPS isotactic polystyrene, PET poly(ethylene terephthalate). 

The only case of textile dermatitis reported to be caused by fiber polymers during the 1990s was that described by Tanaka et al. (1993). In this case, the specific nylon polymer was epsilon-aminocaprioic acid (EACA). This is not one of the usual polymers used to form nylon those polymers being polyhexamethylene adipamide for nylon 66 fibers and polycaproamide for nylon 6 fibers. 

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