Abstract
AbstractTo increase the degree of polymerization of polycapramide, there are two processes: addition of cyclic lactam to linear polymer, and condensation between linear polymers with each other. But after the equilibrium between linear polymer and cyclic lactam is attained, the degree of polymerization is determined only by the condensation. Since the solubility of water in molten polycapramide is less than 0.5%, Henry's law holds well. The equilibrium constant of the condensation is expressed by logK= −0.30 + 1495(1/T). Under any constant vapor pressure of water, the degree of polymerization is increased as the temperature rises. When no stabilizer other than water is used, the number‐average degree of polymerization is determined by logP̄n= 5.97 − 1253(1/T) − ½ logp.
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