交联聚苯乙烯粒子的中空结构及其分析

Hollow Structure and Its Analysis of Cross-linked Polystyrene Particles

以含有油性添加物的苯乙烯—二乙烯基苯悬浮聚合制备交联聚苯乙烯中空粒子.通过对干燥后再溶胀的粒子的热失重分析,借助于粒子中溶胀的异辛烷的释放特性及其释放速率的变化规律,探讨了聚合中单体组成、添加物性质等因素对粒子中空结构形成及其壳层结构的影响.结果显示,易与聚苯乙烯链形成相分离的异辛烷可以产生单中空结构的粒子,并且发现,中空粒子中溶胀物的释放可分为两个具有不同速率特征的阶段,二乙烯基苯的含量会对中空粒子空腔形态与壳壁结构产生进一步的影响.

Structure of styrenen-divinylbenzene copolymer particles prepared by suspension polymerization added with oil additives was studied. The prepared poly（styrenen-divinylbenzene） particles were dried and then swollen with sufficient isooctane. The pre-swollen particles were analyzed by thermogravimetry. The ultrathin sections of the particles were observed with an optical microscope to investigate the structure. Based on release speed and behavior of the isooctane from the pre-swollen particles, the influences of the property and amount of the additives and monomer components on hollow formation and shell structure were discussed. In comparison with different additives such as isooctane and toluene, it was found that perfect hollow structure easily formed in the particles as the additive had poor intermlscibility to the polymer chains. The release of isooctane from the particles can be divided into two stages with different release speeds, which were corresponding to the release of isooctane from the cavum and shell of the hollow particles. According to the further discussions, the cavum and shell structure of the hollow particles are influenced by the weight ratio of the styrene and divinylbenzene.