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Synthesis, Characterization and Haemocompatibility of Poly(styrene-b-isobutylene-b-styrene) Triblock Copolymers  

Ren, Ping (College of Material Science and Engineering, Beijing University of Chemical Technology)
Wu, Yi-Bo (Department of Material Science and Engineering, Bejjing Institute of Petrochemical Technology)
Guo, Wen-Ii (Department of Material Science and Engineering, Bejjing Institute of Petrochemical Technology)
Li, Shu-Xin (Department of Material Science and Engineering, Bejjing Institute of Petrochemical Technology)
Mao, Jing (Key Laboratory for Synthetic Resin, Petrochemical Institute)
Xiao, Fei (College of Material Science and Engineering, Beijing University of Chemical Technology)
Li, Kang (Department of Cardiology, Beijing Hospital)
Publication Information
Polymer(Korea) / v.35, no.1, 2011 , pp. 40-46 More about this Journal
Abstract
The synthesis of well-defined poly(styrene-b-isobutylene-b-styrene) (SIBS) triblock copolymers was accomplished by cationic sequential block copolymerization of isobutylene (IB) with styrene (St) using 1,4-di(2-chloro-2-propyl) benzene (DCC) /$TiCl_4$/2,6-di-tert-butylpyridine(DtBP) as an initiating system in methyl chloride ($CH_3Cl$)/methylcyclohexane(MeChx) (50/50 v/v) solvent mixture at $-80^{\circ}C$. The triblock copolymers exhibited excellent thermoplastic and elastomeric characteristics. Tensile strengths and Shore hardness increased with increasing polystyrene (PS) content, while elongation at break decreased. The blood-compatibility of SIBS was assessed by SEM observation of the platelet adhesion, blood clotting time and haemolysis ratio. The haemolysis ratios were below 5% which met the medical materials standard. The platelet adhesion test further indicated that SIBS block copolymers had a good blood compatibility.
Keywords
poly Cstyrene-b-isobutylene-b-styrene); haemocompatibility; thermoplastic elastomer; living/controlled cationic polymerization.;
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