【摘要】 本文对采用自由基乳液聚合法制备的聚苯乙烯-丙烯酸(polystyrene-acrylic acid,PS-AA)共聚物胶体纳米球进行了微结构表征。发现原始合成的聚苯乙烯胶体球具有典型的核壳结构,磷钨酸(phosphotungstic acid,PTA)优先在核壳界面聚集。中心核主要由疏水性的苯乙烯组成,外壳主要由亲水性的丙烯酸组成。甲苯能对PS-AA胶体球进行原位选择性溶解。溶解过程中,胶体球发生溶胀破裂,中心聚苯乙烯初步溶解,孔结构经历了内径由小到大,孔边缘由粗糙不规则到光滑的变化过程。胶体球形成高分子孔结构,圆孔发生了一定程度的变形。更多还原

【Abstract】 We used transmission electron microscopy(TEM) to characterize the polystyrene-acrylic acid(PS-AA) copolymer latex nanospheres which were formed by surfactant-free emulsion polymerization.The as-prepared PS-AA latex nanospheres are of a core-shell structure,as revealed by phosphoric acid staining.The core is mainly composed of hydrophobic styrene,while the shell is mainly composed of hydrophilic acrylic acid.Immersion of PS-AA nanosphere assemblies in toluene resulted in selective dissolution.The polystyrene core in the PS-AA latex nanospheres first swelled,then the bursting of the acrylic shell led to its gradually dissolution,resulting in a porous polymer structure.The pore size increased gradually with the edge of the pore pores changed from rough to smooth and the shape became more and more spherical.更多还原