EFFECT OF CHEMICAL STRUCTURE OF POLYCARBONATES ON ENTANGLEMENT SPACING  

作　　者：李春成 刘琛阳 

机构地区：[1]Beijing National Laboratory for Molecular Sciences,CAS Key Laboratory of Engineering Plastics,Institute of Chemistry,Chinese Academy of Sciences

出　　处：《Chinese Journal of Polymer Science》2012年第3期343-349,共7页高分子科学（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.20874109);National High Technology Research and Development Program of China(No.2009AA033601) and the Chinese Academy of Sciences

摘　　要：The master curves of a series of aliphatic polycarbonates （APCs） with different lengths of methylene segments in the repeat unit were obtained by dynamic rheological measurements. The plateau modulus and entanglement molecular weight were determined and cross-checked by different methods. Though having distinct difference in chemical structure of repeat units, both APCs and bisphenol-A polycarbonates have the similar entanglement weight and entanglement spacing. On the other side, the plateau modulus decreases with increasing the length of the side group of aliphatic polycarbonates with different side-chain lengths in the literature. The packing length model can explain the relationship between chain structure and entanglements.The master curves of a series of aliphatic polycarbonates （APCs） with different lengths of methylene segments in the repeat unit were obtained by dynamic rheological measurements. The plateau modulus and entanglement molecular weight were determined and cross-checked by different methods. Though having distinct difference in chemical structure of repeat units, both APCs and bisphenol-A polycarbonates have the similar entanglement weight and entanglement spacing. On the other side, the plateau modulus decreases with increasing the length of the side group of aliphatic polycarbonates with different side-chain lengths in the literature. The packing length model can explain the relationship between chain structure and entanglements.

关 键 词：Aliphatic polycarbonates Bisphenol-A polycarbonate Plateau modulus ENTANGLEMENT Packing length model. 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]