Partially biobased polymers:The synthesis of polysilylethers via dehydrocoupling catalyzed by an anionic iridium complex  

作　　者：Xiao-Yong Zhai Xiao-Qing Wang Yi-Xuan Ding Yong-Gui Zhou 

机构地区：[1]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Chemical Letters》2020年第5期1197-1200,共4页中国化学快报（英文版）

基　　金：Financial support from the National Natural Science Foundation of China(No.21690074);Dalian Bureau of Science and Technology(No.2016RD07);Chinese Academy of Sciences(No.XDB17020300)。

摘　　要：Partially biobased polysilylethers(PSEs)are synthesized via dehydrocoupling polymerization catalyzed by an anionic iridium complex.Different types(AB type or AA and BB type)of monomers are suitable.Levulinic acid(LA)and succinic acid(SA)have been ranked within the top 10 chemicals derived from biomass.BB type monomers(diols)derived from LA and SA have been applied to the synthesis of PSEs.The polymerization reactions employ an air-stable anionic iridium complex bearing a functional bipyridonate ligand as catalyst.Moderate to high yields of polymers with number-average molecular weights(Mn)up to 4.38×104 were obtained.A possible catalytic cycle via an Ir-H species is presented.Based on the results of kinetic experiments,apparent activation energy of polymerization in the tempe rature range of 0-10℃is about 38.6 kJ/mol.The PSEs synthesized from AA and BB type monomers possess good thermal stability(T5=418℃to 437℃)and low glass-transition temperature(Tg=49.6℃).

关 键 词：Biodegradable polymers Polysilylethers Iridium catalysis Dehydrocoupling polymerization Levulinic acid 

分 类 号：TQ317[化学工程—高聚物工业]