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Tailoring of Three‐Phase Crystalline Systems in Isotactic Poly(propylene)
Author(s) -
Obadal Martin,
Čermák Roman,
Stoklasa Karel
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500272
Subject(s) - tacticity , crystallization , nucleation , materials science , phase (matter) , chemical engineering , polymer chemistry , crystallography , composite material , polymer , organic chemistry , chemistry , polymerization , engineering
Abstract Summary: A novel method for the tailoring of unique three‐phase crystalline systems in isotactic poly(propylene) has been proven. It is based on a synergistic application of a specific β ‐nucleating agent and high pressure during crystallization. The formation of a γ phase was supported by elevated pressure and high temperature during crystallization; under these conditions the growth of both β and α phases was significantly suppressed. Nevertheless, during the course of crystallization at lower pressure and/or lower temperatures, strong β ‐nucleation efficiency favored the formation of a β phase.