改性剂对PC/ABS复合材料性能的影响
Effect of Modifiers on Properties of PC/ABS Composites
以马来酸酐接枝丙烯腈-丁二烯-苯乙烯三元共聚物(MAH-g-ABS)制备聚碳酸酯/丙烯腈-丁二烯-苯乙烯三元共聚物(PC/ABS)复合材料,研究MAH-g-ABS对PC/ABS相容性、加工性能、力学性能和耐热性能的影响。结果表明:MAH-g-ABS提高了ABS和PC的相容性,加入MAH-g-ABS后,组分粒径变小,缺陷变少,界面整体性变好,ABS和PC的玻璃化转变温度(tg)差值不断减小;随着MAH-g-ABS的加入,PC/ABS的熔体流动速率(MFR)逐渐降低,工作性能有所下降;MAH-g-ABS提高了PC/ABS的力学性能,冲击强度、拉伸性能和弯曲性能得到提高;MAH-g-ABS的加入提高了PC/ABS的耐热性能,维卡软化温度(VST)和热变形温度(HDT)均升高。MAH-g-ABS的最优添加质量分数为6%,与不添加MAH-g-ABS的PC/ABS相比,PC与ABS的相容性提高,界面融合性变好,ABS和PC的tg差值不断减小;冲击强度、拉伸强度、断裂伸长率、弯曲强度和弯曲模量分别提高39.9%、16.7%、25.7%、19.6%和18.6%;VST和HDT分别提高7.5 ℃和7.4 ℃。
Polycarbonate/acrylonitrile-butadiene-styrene (PC/ABS) composites were prepared by maleic anhydride graft acrylonitrile-butadiene-styrene (MAH-g-ABS), and the effects of MAH-g-ABS on the compatibility, processing properties, mechanical properties, and heat resistance of PC/ABS were investigated. The results show that MAH-g-ABS improves the compatibility between ABS and PC. After adding MAH-g-ABS, the particle size of the components decreases, the number of defects decreases, the interface integrity improves, and the difference in glass transition temperature (tg) between ABS and PC continuously decreases. With the addition of MAH-g-ABS, the melt flow rate (MFR) of PC/ABS gradually decreases and the workability decreases. MAH-g-ABS has improved the mechanical properties of PC/ABS, including impact strength, tensile strength and bending performance. The addition of MAH-g-ABS improved the heat resistance of PC/ABS, and both Vicat softening temperature (VST) and heat deflection temperature (HDT) increased. The optimal mass fraction of MAH-g-ABS is 6%. Compared with PC/ABS without MAH-g-ABS, the compatibility between PC and ABS is improved, the interface fusion is improved, and the tg difference between ABS and PC continues to decrease. The impact strength, tensile strength, elongation at break, bending strength and bending modulus increased by 39.9%, 16.7%, 25.7%, 19.6% and 18.6%, respectively. VST and HDT increased by 7.5 ℃ and 7.4 ℃, respectively.
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