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The Effect of Side Chain Length and Hydrogen Bonding on the Viscoelastic Property of Isobutene/Maleimide Copolymers
Author(s) -
Omayu Akitoshi,
Yoshioka Shin'ya,
Matsumoto Akikazu
Publication year - 2009
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900079
Subject(s) - alkyl , substituent , copolymer , polymer chemistry , side chain , maleimide , hydrogen bond , chemistry , viscoelasticity , relaxation (psychology) , intermolecular force , chain (unit) , molecular dynamics , polymer , materials science , computational chemistry , organic chemistry , molecule , composite material , psychology , social psychology , physics , astronomy
The viscoelastic properties of the alternating copolymers of N‐substituted maleimides with n ‐alkyl and ω ‐carboxy‐ n ‐alkyl groups as the N‐substituent with isobutene were investigated by dynamic mechanical analysis. The transition temperatures in the α ‐relaxation region depended on the alkyl chain length and the presence or absence of a terminal carboxy group in the side chain. β ‐Relaxation due to side chain dynamics was also observed in a lower temperature region without merging the α ‐ and β ‐relaxation processes for all the copolymers. The molecular motions of the semiflexible main chain and the flexible side alkyl groups were investigated as well as the intermolecular interaction by hydrogen bonding of the carboxyl groups.