SMA树脂的本体-悬浮法合成及表征研究

PREPARATION OF STYRENE-MALEIC ANHYDRIDE RANDOM COPOLYMER BY BULK-SUSPENSION COPOLYMERIZATION

研究了本体 -悬浮聚合法合成SMA(苯乙烯 -马来酸酐无规共聚物 )树脂的工艺条件 ,考察了本体共聚阶段引发剂种类、引发剂浓度、聚合温度、马来酸酐加料方式、马来酸酐滴加时间、滴加液中马来酸酐与苯乙烯的配比等因素对共聚转化率和SMA组成的影响。加入PVA(聚乙烯醇 )水溶液和补加BPO(过氧化苯甲酰 )进行悬浮聚合 ,并进行了放大试验 ,合成出马来酸酐含量为 5 %～15 % (质量含量 ,下同 )的SMA和PS共混物 ,其中SMA约占 90 %～ 95 %。用双螺杆挤出机挤出造粒得成品SMA树脂。对合成出的SMA树脂进行了DSC、热变形温度及力学性能等的测试 ,分析了MA(马来酸酐 )

The syntheic technology of SMA (a random copolymer of styrene and maleic anhydride )by bulk-suspension copolymerization method had been studied. The influences of the concentration of initiator polymerization temperature, adding modes of MA, dropping time on the conversion and the composition of SMA were investigated under the bulk copolymerization stage. The polymers were thus a blend containing about 5%～10% PS and about 90%～95% SMA contents (based on total polymer weight). The MA in SMA resin existed as anhydride form . The synthesized SMA resins were characterized by DSC, heat distortion temperature and mechanical properties.