物理化学学报2012，Vol.28Issue(4)：892-896,5.DOI:10.3866/PKU.WHXB201202031
沉淀聚合制备聚(季戊四醇三丙烯酸酯-苯乙烯)单分散微球及其形成机理
Preparation and Formation Mechanism of Uniform Polymer Microspheres in Precipitation Polymerization of Pentaerythritol Triacrylate and Styrene
摘要
Abstract
Uniform polymer microspheres were prepared through precipitation polymerization of pentaerythritol triacrylate (PETA) and styrene in ethanol or an ethanol-water mixture using azobisisobutyronitrile (AIBN) as initiator. The effects of the polymerization time, amount of PETA, and water content in the mixed solvent on the polymerization process and the microspheres were studied. Uniform microspheres were readily obtained when the amount of PETA was between 5% and 35% (mass fraction) relative to all monomers with a polymerization time of 6 h. When the mass fraction of PETA was <20%, the microspheres decreased in size and became more uniform as the PETA mass fraction increased. By contrast, when the PETA mass fraction was >20%, the microspheres size increased and the size distribution became larger as the PETA mass fraction increased. With the ethanol-water binary solvent mixture, the monomer conversion and microsphere yield increased compared with those obtained with pure ethanol. However, the water volume fraction needed to be kept below 30%, above which the uniformity of the microspheres was deteriorated. Based on the results, the mechanism of microsphere formation is discussed.关键词
单分散微球/沉淀聚合/乙醇-水混合溶剂/季戊四醇三丙烯酸酯/苯乙烯Key words
Uniform polymer microsphere/ Precipitation polymerization/ Ethanol-water mixed solvent/ Pentaerythritol triacrylate/ Styrene分类
化学化工引用本文复制引用
张召,顾相伶,朱晓丽,孔祥正..沉淀聚合制备聚(季戊四醇三丙烯酸酯-苯乙烯)单分散微球及其形成机理[J].物理化学学报,2012,28(4):892-896,5.基金项目
国家自然科学基金(20874040,20904016)和山东省自然科学基金(Z2008B07)资助项目 （20874040,20904016）
