Synergistic Effect of Multi-Arm Architecture and Molecular Weight on Crystallization and Degradation Behavior of Star-Shaped Poly(Lactic Acid)  

作　　者：Nan Tian Yi-Qing Li Hong-Yi Gan Zhen-Bo Ning Ni Jiang Zhi-Hua Gan 

机构地区：[1]State Key Laboratory of Organic-inorganic Composites,Beijing Laboratory of Biomaterials,College of Life Science and Technology,Beijing University of Chemical Technology,Beijing,100029,China [2]Institute of Material,Sinopec Beijing Research Institute of Chemical Industry,Beijing,100013,China

出　　处：《Chinese Journal of Polymer Science》2024年第12期1948-1956,I0009,共10页高分子科学（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(No.51973010).

摘　　要：Star-shaped poly(lactic acid)s(PLAs)with two to five arms were synthesized by ring opening polymerization using tin(II)2-ethylhexanoate as catalyst and polyols as initiators.The effects of molecular weight together with multi-arm architecture on crystallization behavior,spherulite morphology and alkaline degradation behavior of star-shaped PLAs have been investigated.The results indicate that the multi-arm architecture interfered with spherulite growth,but promoted nucleation and alkaline degradation of star-shaped PLAs.Interestingly,with the increase of molecular weight(M_(n)),the crystallization rate first increased and then decreased,while the alkaline degradation rate was the opposite.The characteristic crystallization and alkaline degradation behavior of star-shaped PLAs were discussed based on the competition between segmental mobility and central core confinement.

关 键 词：Star-shaped poly(lactic acid) CRYSTALLIZATION Spherulite morphology Alkaline degradation 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]