Living Copolymerization of EOVE and MOVE:Fast Flow Synthesis and Thermal Responsive Behavior  

作　　者：Yu-Hang He Dan Xie Yang-Cheng Lu 

机构地区：[1]State Key Laboratory of Chemical Engineering,Department of Chemical Engineering,Tsinghua University,Bejing 100084,China

出　　处：《Chinese Journal of Polymer Science》2022年第10期1193-1200,I0008,共9页高分子科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.21422603,U1662120 and 21978152)。

摘　　要：Random and block copolymers of 2-methoxyethyl vinyl ether(MOVE)and 2-ethoxyethyl vinyl ether(EOVE)were synthesized within 180 s via IBVE-HCl/SnCl_(4) initiating system in the presence of THF in a microflow system.The polymers can be produced continuously and efficiently with extremely narrow molecular weight distributions(M_(w)/M_(n)=1.09-1.18)even at the existence of pendant oxyethylene units Polymerization rate can be accelerated by reducing THF to very low concentration([THF]=50 mmol/L),reaching conversions over 60%and 70%in 60 s for EOVE and MOVE,respectively.Random copolymers poly(MOVE_(100x)-r-EOVE(_(100)(1-x)))(x=0.25,0.5,0.75)experienced very sensitive phase separation process,of which phase separation temperature(T_(ps))can be adjusted between 20 and 70℃by controlling monomer composition.On the other hand,thermally induced phase separation of diblock copolymers poly(MOVE_(100)-b-EOVE_(100))was not so sensitive as its random copolymer counterpart.Relatively bigger difference between phase separation temperatures of heating and cooling process(ΔT_(ps))was found for diblock copolymer.

关 键 词：Living cationic polymerization STIMULI-RESPONSIVE Microflow system 

分 类 号：O631[理学—高分子化学]