一种国产新型反应性增容剂在PA6与ABS合金中的应用

APPLICATION OF A HOMEMADE NOVEL COMPATIBILIZER IN PREPARING SUPER-TOUGHENING PA6/ABS BLENDS

以国产苯乙烯-丙烯腈-顺丁烯二酸酐共聚物(SAM)为原位反应性增容剂,制备了超韧PA6/ABS合金。在m(PA6)/m(ABS)为50/50～70/30和SAM加入量为3%～4%时,23℃的合金悬臂梁缺口冲击强度达900J/m以上;-18℃的合金悬臂梁缺口冲击强度达270J/m。电镜和力学性能测试表明原位反应性增容使PA6和ABS两相界面张力降低,并使ABS分散颗粒变小及更均匀地分散于PA6中。另外,过多的SAM用量将导致PA6与SAM间的深度反应,使体系粘度上升和ABS相难于被分散。总之,SAM用量、相界面张力和ABS分散颗粒大小是影响该合金力学性能的关键因素。

The super-toughening PA6/ABS blends were successfully prepared using a homemade styrene-acrylonitrile-maleic anhydride terpolymer (SAM). The blends with the 50/50~70/30 mass ratios of PA6 to ABS and the addition of 3%~4% SAM exhibited the notched Izod strength>900 J/m at room temperature and >270 J/m at (-18) ℃. SEM photomicrographs and mechanical testing show that the in-situ reactive compatibilization with the addition of SAM makes the PA6/ABS interfacial tension reduced and ABS domains become smaller and more uniformly dispersed throughout the blends. The increase in SAM at above 7% limits the improvement in the properties of the blends, which is due to that the profound reaction between PA6 and SAM makes the blends more viscous and the dispersion of ABS domains difficult. Therefore, the size of ABS domains, the interfacial tension and amount of SAM play their important roles in improving the performance of PA6/ABS blends.