Synthesis of PMMA-b-PBA Block Copolymer in Homogeneous and Miniemulsion Systems by DPE Controlled Radical Polymerization

doi:10.1002/pola.23498

CNU IR > Pharmacy and Science > Dept. of Cosmetic Science and institute of cosmetic science > Periodical Articles > Item 310902800/23133

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題名:	Synthesis of PMMA-b-PBA Block Copolymer in Homogeneous and Miniemulsion Systems by DPE Controlled Radical Polymerization
作者:	Ying-Da Luo I-Chen Chou Wen-Yen Chiu Chia-Fen Lee
貢獻者:	化粧品應用與管理系
關鍵詞:	block copolymer controlled/living radical polymerization 1,1-diphenylethene emulsion polymerization miniemulsion polymerization molecular weight distribution/molar mass distribution
日期:	2009-09
上傳時間:	2010-10-26 16:06:57 (UTC+8)
摘要:	In this research, poly(methyl methacrylate)-b-poly(butyl acrylate) (PMMA-b-PBA) block copolymers were prepared by 1,1-diphenylethene (DPE) controlled radical polymerization in homogeneous and miniemulsion systems. First, monomer methyl methacrylate (MMA), initiator 2,2′-azobisisobutyronitrile (AIBN) and a control agent DPE were bulk polymerized to form the DPE-containing PMMA macroinitiator. Then the DPE-containing PMMA was heated in the presence of a second monomer BA, the block copolymer was synthesized successfully. The effects of solvent and polymerization methods (homogeneous polymerization or miniemulsion polymerization) on the reaction rate, controlled living character, molecular weight (Mn) and molecular weight distribution (PDI) of polymers throughout the polymerization were studied and discussed. The results showed that, increasing the amounts of solvent reduced the reaction rate and viscosity of the polymerization system. It allowed more activation–deactivation cycles to occur at a given conversion thus better controlled living character and narrower molecular weight distribution of polymers were demonstrated throughout the polymerization. Furthermore, the polymerization carried out in miniemulsion system exhibited higher reaction rate and better controlled living character than those in homogeneous system. It was attributed to the compartmentalization of growing radicals and the enhanced deactivation reaction of DPE controlled radical polymerization in miniemulsified droplets
關聯:	Journal of Polymer Science Part A-Polymer Chemistry 47(17)：4435-4445
顯示於類別:	[Dept. of Cosmetic Science and institute of cosmetic science] Periodical Articles

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