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Phase morphologies of vulcanized chlorobutyl rubber/polyamide 12 blends: The breakup of pre‐crosslinked CIIR phase
Author(s) -
Yao Pengjun,
Tian Ming,
Zhang Liqun,
Tian Hongchi,
Wu Youping,
Ning Nanying
Publication year - 2014
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.40765
Subject(s) - materials science , vulcanization , composite material , natural rubber , thermoplastic , plasticizer , polyamide , butyl rubber , phase (matter) , thermoplastic elastomer , breakup , rheology , polymer blend , polymer , viscosity , polymer chemistry , chemistry , organic chemistry , copolymer , psychology , psychoanalysis
Dynamic vulcanization to prepare blended thermoplastic vulcanizates (TPV) is a kind of complicated blending technology, where the breakup of the rubber phase happens accompanying with the crosslinking of rubber. In this study, we aim to investigate the effect of crosslinking on the breakup of chlorobutyl rubber (CIIR) phase in thermoplastic polyamide 12 (PA 12) matrix by purposely using pre‐crosslinked CIIR with different crosslink degrees and plasticizer contents. Besides, the effect of blending conditions on the breakup of crosslinked CIIR phase was studied. The results show that a low crosslink degree, a high content of plasticizer, a low blending temperature and a morderate rotor speed of 70 rpm facilitate the breakup of pre‐crosslinked CIIR in PA 12 matrix. This is ascribed to the decrease in the modulus of pre‐crosslinked CIIR phase because of either a low crosslink degree or a high content of plasticizer, the increase in the molten viscosity of thermoplastic matrix because of a low blending temperature and a moderate rotor speed. It is indicated that the breakup of pre‐crosslinked rubber is mainly dominated by the modulus of crosslinked rubber phase as well as the molten viscosity of thermoplastic matrix and shear stress. This study will provide guidance for the preparation of CIIR/PA TPV. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40765.