关键词: 间规立构聚苯乙烯, 核壳乳胶粒子, 结晶行为, 熔融行为

Abstract: In this paper, syndiotatic polystyrene/polybutylacrylateatactic polystyrene (sPS/PBA-aPS) coreshell latex particles blends were prepared by means of melt blending. The effect of PBA-aPS on the crystallization behavior and crystalline morphology of sPS was investigated using scanning calorimetry (DSC) and polarized optical microscopy (PLM). In addition, DSC and XRD were used to study the effect of cooling rate and isothermal crystallization temperature on melting behavior of sPS/PBA-aPS blends. The experimental results indicated that the addition of PBA-aPS coreshell latex particles hindered the crystallization of sPS. It was obvious that the meltingrecrystallizationremelting processes existed during the melting. Equilibrium melting point of sPS was 293.2 ℃. With increasing amount of PBA-aPS, the equilibrium melting points of sPS decreased and βcrystal became imperfect, the impact strength was obviously improved. When the mass ratio of sPS/PBA-aPS was 75:25, the impact strength was improved by 117 % based on neat sPS.

Key words: syndiotatic polystyrene, core-shell latex particles, crystallization behavior, melting behavior