Journal
FIBERS AND POLYMERS
Volume 8, Issue 1, Pages 7-12Publisher
KOREAN FIBER SOCIETY
DOI: 10.1007/BF02908153
Keywords
shape memory; copolymer; cross-linking; pentaerythritol
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Funding
- National Research Foundation of Korea [R11-2005-065-02003-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Polyurethane block copolymers chemically cross-linked by pentaerythritol, a four-way cross-linker, are tested for the shape memory effect. One of the copolymers shows higher shape recovery than any other shape memory copolymer synthesized by us so far. The copolymer maintains a surprising 94 % shape recovery after the third cyclic test. The four-way cross-linking by pentaerythritol and interaction between hard segments are mainly responsible for the very high shape recovery. Tensile mechanical properties also significantly improve by cross-linking. Glass transition temperature (T,) slightly increases with cross-linking content. Other characterization such molecular weight, IR, and X-ray diffraction is also carried out to understand the arrangement of copolymer chains.
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