高性能PC/ABS合金的研究

Research on high quality PC/ABS alloy

利用双螺杆挤出机制备了PC/ABS系列合金,探讨了甲基丙烯酸甲酯/丁二烯/苯乙烯共聚物(MBS)和苯乙烯/马来酸酐共聚物(SMA)对PC/ABS合金的增韧和增容作用,采用力学测试方法、扫描电子显微镜(SEM)研究了MBS和SMA对PC/ABS合金的力学性能和形态结构的影响。结果表明:在PC/ABS合金(70/30)体系中,加入6份MBS,合金的缺口冲击强度为86 kJ/m2,是没加MBS时的1.5倍左右;而拉伸强度得到了较好的保持;SMA与MBS复合起来以后,具有一定的协同效应,当SMA、MBS质量分数分别为4%、6%时,合金的缺口冲击强度达到115 kJ/m2,拉伸强度接近单独PC/ABS(70/30)合金,为56.5 MPa。

The PC/ABS alloy is prepared by twin-screw extruder. The effects of MBS and SMA on toughness and compatibility of PC/ABS alloy are discussed. Scanning electron microscopy and mechanical test methods are used to measure the mechanical properties and morphological structure of the alloy. The results show that：notch impact strength is 86 kJ/m^2 which is 1.5 times as strong compared to pure PC/ABS （70/30） alloy;there is little change of its tensile strength by adding 6 phr MBS into PC/ABS（70/30） alloy;MBS and SMA have a certain synergy effect,when the content of SMA and MBS are 4 phr and 6 phr,notch impact strength is up to 115 kJ/m^2 ,while the tensile strength is 56.5 MPa close to pure PC/ABS（70/30） alloy.