Polymorphie, Kristallinität und Schmelzwärme von Poly(ε‐caprolactam), 1. IR‐spektroskopische Untersuchungen

Poly(ε‐caprolactam), (polyamide‐6) crystallizes in different modifications, which show different characteristic IR absorption bands. The absorption coefficients of the bands were evaluated from the dependence of their intensity on temperature and specific volume of different polyamide‐6 samples. A method is described how to determine quantitatively the amounts of α‐ and γ*‐modifications and of the amorphous phase. On the basis of these data the densities of the samples were calculated and shown to agree with the values determined experimentally. The specific volume of the amorphous phase is v = 0,917 cm3/g, and is independent of any contents of α, γ*‐, or γ‐modifications the samples may contain.