Synthesis and characterization of poly(methyl methacrylate) nanoparticles by emulsifier-free emulsion polymerization with a redox-initiated system
學年 97
學期 1
出版（發表）日期 2008-09-01
作品名稱 Synthesis and characterization of poly(methyl methacrylate) nanoparticles by emulsifier-free emulsion polymerization with a redox-initiated system
作品名稱（其他語言）
著者 Chiu, Tso-pei; 董崇民; Don, Trong-ming
單位 淡江大學化學工程與材料工程學系
出版者 Wiley-Blackwell
著錄名稱、卷期、頁數 Journal of Applied Polymer Science 109(6), pp.3622-3630
摘要 In this study, the emulsifier-free emulsion polymerization of methyl methacrylate (MMA) was initiated directly by a Cu2+/HSO redox system. Latex particles with negative charge due to the bonded anionic sulfite ion were successfully synthesized after 2 h of reaction at 40-60°C. Scanning electron microscopy pictures showed a uniform particle size distribution, and the average size decreased from 223 to 165 nm wit increasing reaction temperature from 40 to 60°C. The initiation step in the polymerization mechanism was proven to be a redox reaction, in which Cu2+ oxidized the bisulfite ion to produce an anionic sulfite radical and proton. The produced anionic sulfite radical then initiated the polymerization of MMA. Moreover, Cu2+ not only served as one component in the redox initiator system but also as a chain-transfer agent that terminated growing polymer chains to produce chains with unsaturated end groups [poly(methyl methacrylate) (PMMA)CHCH2]. For this system, about 17% PMMACHCH2 was produced. The tacticities of the PMMA latex prepared at 40-60°C were almost the same, about 62-64% syndiotactic, 33-35% heterotactic, and 3% isotactic. These PMMA latexes had almost the same glass-transition temperature, 125-127°C, regardless of the reaction temperatures, and their weight-average molecular weights were in the range between 254,000 and 315,000.
關鍵字
語言 en
ISSN 0021-8995
期刊性質 國外
收錄於
產學合作
通訊作者
審稿制度 否
國別 USA
公開徵稿
出版型式 ,電子版
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