含笼型倍半硅氧烷的丙烯酸酯芯壳聚合物的合成及在改性聚氯乙烯中的应用

Synthesis of Polyhedral Oligomeric Silsesquioxanes-Containing Acrylate Core-Shell Polymers and Application in Modification of Poly(Vinyl Chloride)

合成了具有不同甲基丙烯酰氧丙基笼型倍半硅氧烷(MAP-POSS)含量和不同芯壳比的丙烯酸酯芯壳聚合物(ACR)树脂,并用透射电子显微镜研究了ACR乳胶粒子的形态;用动态力学谱仪研究了聚氯乙烯(PVC)/ACR共混物的动态力学性质;测试了PVC/ACR共混物的塑化行为和力学性能。结果表明,MAP-POSS在ACR芯中参与接枝和交联反应;MAP-POSS加入量为单体质量5%和10%时,壳层有最高的玻璃化转温度;芯/壳比为1∶1时,ACR粉末效果较好;PVC/ACR共混物材料塑化时间随ACR的含量增加而缩短,而塑化扭矩增大;ACR加入量为m(ACR)/m(monomer)=11/100时共混材料具有最大的冲击强度,较未加时提高了72.9%,比不含增塑剂的纯PVC提高了3.41倍。

A series of acrylic core-shell resins(ACR) with the different amount of methylacryloylpropyl polyhedral oligomeric silsesquioxane(MAP-POSS) and core/shell ratio were synthesized and characterized by TEM and particle sizer. The dynamic mechanical properties of ACR and PVC/ACR blends were characterized by dynamic mechanical analysis(DMA); the plasticizing behavior and mechanical properties of the blends were determined. The results show that MAP-POSS takes part in the grafting and cross-linking reaction in the core of the ACR; the shell has the highest glass transition temperature when the MAP-POSS content is m(MAP-POSS)/m(monomer) = 5 /100 and 10 /100; the powder effect is better when the core/shell mass ratio is 1 ∶ 1; the plasticizing time decreases while the plasticizing torque increases as the ACR content increases; the blends show the best impact resistance when the ACR addition is m(ACR) /m(monomer) = 11 /100 of the matrix,which is 72. 9% higher than that without ACR,and it is 3. 41 times of that of pure PVC.