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In situ Collapse of Phase‐Separated Structure by Covalent Bond Cleavage at a Branching Point upon Heating
Author(s) -
Sato Eriko,
Kitamura Tomoaki,
Matsumoto Akikazu
Publication year - 2008
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.200800527
Subject(s) - copolymer , polymer chemistry , branching (polymer chemistry) , materials science , polystyrene , covalent bond , annealing (glass) , chemical engineering , chemistry , polymer , composite material , organic chemistry , engineering
A branched copolymer containing a degradable polyperoxide linkage at a branching point was synthesized by the radical copolymerization of dienyl‐functionalized polystyrene and polyisoprene macromonomers with molecular oxygen. The ternary mixture of the branched copolymer and the macromonomers showed phase‐separated structure after annealing at 45 and 90 °C. The adjacent spacing of the phase‐separated structure was in the order of submicron to micrometer, which is larger than that of general microphase separated structures, due to the presence of homopolymers (macromonomers). Annealing at 110 °C induced thermal decomposition of the polyperoxide followed by in‐situ collapse and a drastic morphology change in the phase‐separated structure.