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Block copolymer of trans ‐polyisoprene and urethane segment: Shape memory effects
Author(s) -
Ni Xiuyuan,
Sun Xiaohui
Publication year - 2006
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.23012
Subject(s) - copolymer , materials science , shape memory alloy , composite material , casting , morphology (biology) , ultimate tensile strength , polymer , shape memory polymer , phase (matter) , polymer chemistry , chemistry , genetics , organic chemistry , biology
Shape memory behaviors of trans ‐polyisoprene (TPI) segmented urethane copolymers were studied. Film specimens for cyclic loading tests were prepared from the polymer solution by casting, and tested at the loading temperature of 65°C. Results show that the recovery rates of the films depend on their TPI segment contents, while the fixity rate was measured to be close to 100% for each sample. The film containing 70% TPI segments was found to show a recovery rate of 85%. Two separated phases were clearly observed in the morphology of the films. The urethane segments were organized into spherical domains acting as physical cross‐links during the shape memory process. The continuous phase formed by the crystalline TPI segments serves as the reversible phase responsible for fixation of the temporary shape. The tensile and dynamic thermal properties of those films were also studied. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 879–885, 2006