Polar Three-Arm Star Block Copolymer Thermoplastic Elastomers Based on Polyacrylonitrile

Autor:	Kaloian Koynov, Krzysztof Matyjaszewski, Chuanbing Tang, Tadeusz Pakula, Bruno Dufour, Ying Zhang
Rok vydání:	2008
Předmět:	Acrylate Morphology (linguistics) Materials science Polymers and Plastics Scattering Organic Chemistry Polyacrylonitrile Elastomer Inorganic Chemistry chemistry.chemical_compound chemistry Polymer chemistry Materials Chemistry Copolymer Polar Composite material Thermoplastic elastomer
Zdroj:	Macromolecules. 41:2451-2458
ISSN:	1520-5835 0024-9297
Popis:	A series of well-defined poly(n-butyl acrylate)-b-polyacrylonitrile (PBA−PAN) triarm star block copolymers have been synthesized by ATRP. The incorporation of very polar hard segment of PAN was made possible with the aid of the halogen-exchange technique. Phase-separated morphology of cylindrical PAN domains hexagonally arranged in the pBA matrix was observed by atomic force microscopy and small-angle X-ray scattering in all studied materials. The mechanical and thermal properties of the PBA−PAN triarm star block copolymers have been thoroughly characterized, and their thermoplastic elastomer behavior was studied. It was found that these block copolymers retain a phase-separated morphology until temperatures of at least 250 °C. Furthermore, because of chemical cross-linking of the PAN segments that takes places at around 280 °C, the triarm star PBA-PANs preserve their elastomeric properties until temperatures of more than 300 °C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::20fc17652d9710eb671d5ce9f7d839e7 https://doi.org/10.1021/ma702561b Zobrazit plný text záznamu