sPS/PBA-aPS共混物的结晶与熔融行为  

Crystallization and Melting Behavior of sPS/PBA-aPS Blends

作　　者：于野[1] 刘喜军[1,2] 孙星星[1] 娄春华[1,2] 张学全[3] 

机构地区：[1]齐齐哈尔大学材料科学与工程学院,黑龙江齐齐哈尔161006 [2]黑龙江教育厅复合改性材料重点实验室,黑龙江齐齐哈尔161006 [3]中国科学院长春应用化学研究所,吉林长春130022

出　　处：《中国塑料》2015年第7期46-52,共7页China Plastics

基　　金：黑龙江省自然科学基金资助项目(E201343)

摘　　要：通过熔融共混法制备了间规立构聚苯乙烯/聚丙烯酸丁酯-无规立构聚苯乙烯核壳乳胶粒子(sPS/PBAaPS)共混物,采用差示扫描量热仪、X射线衍射仪和偏光显微镜研究了PBA-aPS对sPS结晶性能、结晶形态的影响,以及共混物在不同降温速率下、等温结晶条件下所得试样的熔融行为。结果表明,PBA-aPS的引入对sPS的结晶起阻碍作用,sPS及其共混物存在明显熔融-重结晶-再熔融现象,sPS平衡熔点为293.2℃,共混物的平衡熔点随PBAaPS含量增加而降低,sPS形成β型大球晶完善性变差,sPS/PBA-aPS共混物的冲击强度明显提高,sPS/PBA-aPS质量比为80∶20时,冲击强度提高了117%。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.

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 

分 类 号：TQ325.2[化学工程—合成树脂塑料工业]