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“Chain‐End‐Controlled Isotactic” and “Stereoblock‐Isotactic” Polypropylene: Where Is the Difference?
Author(s) -
Busico Vincenzo,
Cipullo Roberta,
Talarico Giovanni,
Castelli Valeria Van Axel
Publication year - 2003
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/bmbv-8r8h-w4ft-fqb8
Subject(s) - tacticity , steric effects , chemistry , polypropylene , metallocene , chain (unit) , polymer chemistry , microstructure , polymer science , crystallography , polymerization , organic chemistry , polymer , physics , astronomy
This communication describes the microstructure of “stereoblock‐isotactic” polypropylene obtained with sterically hindered “oscillating” metallocene catalysts, points out in which respects it differs from that of “chain‐end‐controlled isotactic” polypropylene, and explains why the two definitions cannot be used as synonymous (as is commonly found in the literature).