Abstract
The intrinsic viscosity of polyamide-6 (PA-6) solutions in mixtures of m-cresol and methanol decreases with increasing methanol concentration. A conformational transition occurs in the 50–60% methanol concentration range. This phenomenon has been studied by viscometric measurements for various methanol concentrations, a two-fold decrease of intrinsic viscosity having been observed. The results are interpreted by assuming that the observed decrease in intrinsic viscosity is due to a coil-globule conformational change in the polyamide-6 molecules. A decrease of intrinsic viscosity also occurs on increasing the temperature at which the viscometric measurements are carried out. This is explained by the possibility of occurrence of a cis-trans isomerisation, and of a partial helix-coil conformational change.
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