新型乳液聚合制备疏松PMMA树脂及成粒机理  

PREPARATION OF POROUS PMMA RESIN BY A NEW EMULSION POLYMERIZATION PROCESS AND THE MECHANISM OF PARTICLE FORMATION

作　　者：包永忠[1] 朱勤[1] 黄志明[1] 翁志学[1] 

机构地区：[1]浙江大学聚合反应工程国家重点实验室,杭州310027

出　　处：《高分子学报》2004年第2期232-235,共4页Acta Polymerica Sinica

基　　金：国家自然科学基金资助项目 (基金号 2 990 60 0 9)

摘　　要：采用以水相为分散相、甲基丙烯酸甲酯 (MMA) 环己烷混合物为连续相的新型乳液聚合制备PMMA树脂 .发现 ,在未加乳化剂和加入少量Tween2 0乳化剂时 ,均可制备由初级粒子凝聚而成、无明显皮膜结构的疏松PMMA粒子 ,初级粒子粒径小于环己烷存在下MMA悬浮聚合得到的PMMA粒子的初级粒子 .根据聚合体系相构成、PMMA在MMA 环己烷混合液的溶解性及PMMA粒子粒径分布和形态的演变 ,提出了在分散水滴内乳液聚合形成初级粒子 生长A new emulsion polymerization process, in which water acted as the dispersed phase and the mixture of methyl methacrylate (MMA) and cyclohexane as the continuous phase, was applied to prepare PMMA resin. It showed that porous PMMA particles composed of aggregated primary particles were prepared by the new polymerization process. The size of these primary particles was smaller than that of the primary particles of PMMA resin prepared by MMA suspension polymerization in the presence of cyclohexane. According to the phase structure of the initial polymerization system, the solubility of PMMA in the mixture of MMA and cyclohexane and the variations of particle size distribution and morphology of PMMA resin, a particle formation mechanism of the new polymerization was proposed, covering the formation and growth of primary particles and their coagulation in the dispersed water droplets.

关 键 词：疏松PMMA树脂 成粒机理 乳液聚合 制备 甲基丙烯酸甲酯 环己烷 颗粒形态 

分 类 号：TQ325[化学工程—合成树脂塑料工业]