Structure-property relationship and shape memory effect of polyurethane copolymer cross-linked with pentaerythritol
Autor: | Yong-Chan Chung, Byoung Chul Chun, Mi Hwa Chong, Hye Ran Kim, Tae Keun Cho |
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Rok vydání: | 2007 |
Předmět: | |
Zdroj: | Fibers and Polymers. 8:7-12 |
ISSN: | 1875-0052 1229-9197 |
Popis: | 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 g ) 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. |
Databáze: | OpenAIRE |
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