Optically Active Polyethers. 1. Studies of the Crystallization in Blends of the Enantiomers and the Stereoblock Form of Poly(epichlorohydrin)

摘要: The isothermal crystallization kinetics and morphology of the melt-crystallized optically active polyenantiomers, their blends, stereoblock form poly(epichlorohydrin) have been investigated using polarized light video microscopy. polyenantiomers develop regularly banded spherulites, while equimolar blend polymer nonbanded, coarser spherulites. apparent morphological differences among polymers suggest a stereospecific segregation at growth front in an attempt to produce pure lamellae. equilibrium melting temperature as determined by classical Hoffman-Weeks method was found be 411 ± 1 K for all polymers. Over range temperatures from T g (247 K) m °, spherulite radial rates 50 :50 are depressed relative those either components. A further marked reduction is recorded polymer. An analysis linear terms Hoffman-Lauritzen treatment gave evidence development larger folds, hence rougher lamellar surface than polyenantiomers.