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Mechanical relaxations of nylon–polyurea block copolymers
Author(s) -
Gardlund Zack G.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070420115
Subject(s) - polyurea , copolymer , materials science , miscibility , nylon 6 , anionic addition polymerization , polymer , polymer chemistry , nylon 66 , caprolactam , composite material , polymerization , polyamide , polyurethane
Dynamic mechanical analysis from −150 to +150°C has been carried out on seven block copolymers that were prepared by the in situ anionic polymerization of caprolactam in the presence of a preformed polyurea. The various relaxations have been identified and activation energies calculated. Some polymer–polymer miscibility of the polyurea and amorphous nylon copolymer segments is indicated by the compositional dependence of the α relaxation.