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《Acta Polymerica Sinica》 2012-01
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SURFACTANT-FREE EMULSION POLYMERIZATION OF METHYL METHACRYLATE INITIATED BY α-METHYL STYRENE-MALEIC ANHYDRIDE COPOLYMER MACROINITIATOR

CAO Lijuan1,YIN Meizhen1,MA Yuhong2,YANG Wantai1(1 State Key Laboratory of Chemical Resource Engineering;2 Key Laboratory of Carbon Fiber and Functional Polymers, Beijing University of Chemical Technology,Beijing 100029)  
The copolymer of α-methyl styrene(AMS) and maleic anhydride(MANH) was synthesized by self-stable precipitation polymerization.The resulting AMS-MANH copolymer was saponified and then served as macroinitiator and emulsifier for the further surfactant-free polymerization of methyl methacrylate(MMA).Surfactant-free emulsion polymerization of MMA was carried at 90℃.The AMS-MANH copolymer and the obtained block-copolymer were characterized by Fourier transform infrared spectroscopy(FTIR),nuclear magnetic resonance(NMR),gel permeation chromatography(GPC) and scanning electron microscopy(SEM).The results showed that the surfactant-free polymerization of MMA can be carried out by using saponified AMS-MANH copolymer,without any other initiator and emulsifier.Based on FTIR and 1H-NMR,the emulsion polymerization product was block copolymer of PMMA and AMS-MANH copolymer.During the process of surfactant-free polymerization of MMA,the polymerization rate increased along with the increasing of the concentration of macroinitiator.The maximum of polymerization conversion was 85% and the particle sizes ranged from 150 nm to 200 nm.The intrinsic viscosity number of the copolymer was about 80 mL/g.In addition,the intrinsic viscosity numbers of copolymers increased linearly with the rising of polymerization conversion.Based on the research results,a possible reaction mechanism has been proposed.This novel method is expected to be applied to other kinds of monomers.
【Fund】: 长江学者和创新团队发展计划(项目号IRT0706);; 中央高校基本科研业务费资助(项目号ZD0902);; 北京市共建项目专项资助
【CateGory Index】: TQ316.334
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