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
Rok vydání:	2007
Předmět:	Diffraction Materials science Polymers and Plastics General Chemical Engineering Structure property General Chemistry Shape-memory alloy Pentaerythritol chemistry.chemical_compound chemistry Ultimate tensile strength Copolymer Composite material Glass transition Polyurethane
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
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ede14ff40c5f23a9cfb3eb92ca1cdb7f https://doi.org/10.1007/bf02908153 Zobrazit plný text záznamu Full text from SpringerLink