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《高分子科学(英文版)》 2018-02
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Stereoselective Ring-opening Polymerization of rac-Lactide by Bulky Chiral and Achiral N-heterocyclic Carbenes

Hui Li;Bai-Ru Ai;Miao Hong;Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province,Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences;  
Despite the extraordinary success has been achieved in metal catalyst-promoted stereoselective ring-opening polymerization(ROP) of rac-lactide(rac-LA), well-controlled stereoselective rac-LA ROP by organic catalyst still remains a scientific challenge. Here we report our investigations into organocatalytic stereoselective ROP of rac-LA by utilizing novel bulky chiral and achiral N-heterocyclic carbenes(NHC), 1,3-bis-(1′-naphthylethyl)imidazolin-2-ylidene. The effect of polymerization conditions(e.g. solvent, temperature, alcohol initiator) on ROP behavior by these bulky NHCs has been fully studied, leading to the formation of isotactic-rich stereoblock polylactide(P_i = 0.81) under optimized conditions with high activity(Conv. = 98% in 30 min) and narrow molecular weight dispersity(? = 1.05).
【Fund】: financially supported by the Science and Technology Commission of Shanghai Municipality (No. 17JC1401200)
【CateGory Index】: O631.5
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