AbstractThe polymer–polymer solution of poly(vinyl chloride) and poly‐ε‐caprolactone yields an excellent system for studying the crystallization kinetics of a crystallizable component from a polymer–polymer solution. Unlike previous studies of isotactic–atactic polystyrene solutions for which the glass transition temperature is invariant with composition, this system exhibits a marked dependence ofTgon the composition. The experimental datadE⅓(modulus)/dt(psi⅓/min) were obtained over a composition range of 40 to 70 wt‐ poly‐ε‐caprolactone. With the appropriate modification of the spherulitic growth rate equation, the expressiondocumentclass{article}pagestyle{empty}begin{document}$ frac{dE^{{1 mathord{left/{vphantom {1 3}} right.kern-nulldelimiterspace} 3}}}{dt}=k'left( {1 - C_d } right)_e frac{-Delta F_{WLF}}{RT},left( Delta F_{WLF}=frac{4120T}{51.6+T-T_g}right)$end{document}approximated a reasonable fit of the experimental data. This demonstrates a marked dependence of the crystallization rate on concentration. Secondary observations of this investigation show a slower crystallization rate for high molecular weight poly‐ε‐caprolactone and a slow secondary crystallization step. Both homopolymer poly‐ε‐caprolactone and poly‐ε‐caprolactone in the poly‐ε‐caprolactone/poly(vinyl chloride) solution show a slow (relative to the nucleation‐controlled step) crystallization stage consi
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