title: Synthesis, characterizations and biocompatibility of novel biodegradable star block copolymers based on poly[(R)-3-hydroxybutyrate] and poly(epsilon-caprolactone).
abstract: Star block copolymers based on poly[(R)-3-hydroxybutyrate] (PHB) and poly(epsilon-caprolactone) (PCL), termed SPHBCL, were successfully synthesized with structural variation on arm numbers and lengths via coupling reactions and ring opening polymerizations. Arm numbers 3, 4 and 6 of SPHBCL were synthesized by using different multifunctional cores, such as trimethyol propane, pentaerythiritol and dipentaerthritol, respectively. Gel permeation chromatography (GPC) and (1)H and (13)C nuclear magnetic resonance were used to characterize the structure of SPHBCL. GPC failed to produce accurate molecular weights of the SPHBCL due to the discrepancy of star copolymer structures. The melting temperature of SPHBCL decreased with increasing degree of branching. Thermal decomposition temperature was revealed to be lower than that of linear block copolymer LPHBCL counterparts based on PHB and PCL. Films made from various SPHBCL copolymers had different porous or networking surface morphology, and all possessed improved biocompatibility in terms of less blood clotting and more osteoblast cell growth compared with their corresponding homopolymers PHB and PCL. Among them, it was found, however, that the 4-arm star block copolymer 4SPHBCL-25 showed unique surface properties, i.e. a regular nanoravine structure was observed by scanning electron microscopy and atomic force microscopy. This 4-arm star copolymer also showed the best biocompatibility.
authors: Multidisciplinary Research Center, Shantou University, Shantou, Guangdong 515063, China.
authors: Linping
authors: L
authors: Wu
authors: Liang
authors: L
authors: Wang
authors: Xiaojuan
authors: X
authors: Wang
authors: Kaitian
authors: K
authors: Xu
mesh_terms: D016475:3T3 Cells; D020341:Absorbable Implants; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry*; D018929:Cell Culture Techniques / Q000379:methods; D049109:Cell Proliferation; D002470:Cell Survival; D003460:Crystallization / Q000379:methods; D008422:Materials Testing; D051379:Mice; D011091:Polyesters / Q000737:chemistry*; D013499:Surface Properties; D023822:Tissue Engineering / Q000379:methods*; D000094122:Polyhydroxybutyrates
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; C476612:poly(3-hydroxybutyrate-co-epsilon-caprolactone); D000094122:Polyhydroxybutyrates