PC/ABS共混材料的制备及性能研究

Preparation and Performance Study of PC/ABS Blends

采用苯乙烯-马来酸酐共聚物(SMA)接枝到二氧化硅纳米粒子上,通过两步法制备聚碳酸酯/丙烯腈-丁二烯-苯乙烯共聚物(PC/ABS)共混材料,探究SMA共聚物对PC/ABS共混材料热膨胀系数(CTE)和冲击强度的影响。结果表明:SMA共聚物的掺入,导致PC/ABS共混材料的流动性变差,而其耐热性增强。同时,随SMA掺量的增加,PC/ABS共混材料的CTE均较S0有不同程度的降低,其中S1、S2、S3和S4的CTE较S0分别降低了19.8%、44.5%、43.1%、41.4%。SMA共聚物的加入有效提升了PC/ABS复合材料的LOI数值,其中S2试样具有最高的LOI数值,为28.8%,且UL-94测定结果为V-0,未出现滴落现象。此外,随着SMA共聚物掺量的增加,PC/ABS共混材料的拉伸强度呈现先上升后小幅度降低的趋势,弯曲强度呈现先上升后稳定变化的趋势,断裂伸长率呈现先下降后稳定变化的趋势,缺口冲击强度呈现一直上升的趋势。其中,S2试样具有最高的拉伸强度、弯曲强度和较高的缺口冲击强度,分别为41.6 MPa、102.4 MPa和15.3 J/m^(2),分别较S0试样的对应参数增加了29.6%、10.7%和1.35倍。

Using styrene maleic anhydride copolymer(SMA)grafted onto silica nanoparticles,polycarbonate/acrylonitrile butadiene styrene copolymer(PC/ABS)blends were prepared by a two-step method,and the effect of SMA copolymer on the coefficient of thermal expansion(CTE)and impact strength of PC/ABS blends was investigated.The results showed that the addition of SMA copolymer resulted in a decrease in the flowability of PC/ABS blends,while their heat resistance was enhanced.Meanwhile,with the increase of SMA content,the CTE of PC/ABS blends decreased to varying degrees compared to S0,among which the CTE of S1,S2,S3 and S4 respectively decreased by 19.8%,44.5%,43.1%,and 41.4%compared to S0.The addition of SMA copolymer effectively improved the LOI value of PC/ABS composites,with S2 sample having the highest LOI value of 28.8%,and the UL-94 measurement result was V-0,with no dripping observed.In addition,with the increase of SMA copolymer content,the tensile strength of PC/ABS blends shows a trend of first increasing and then slightly decreasing,the bending strength shows a trend of first increasing and then stabilizing,the elongation at break shows a trend of first decreasing and then stabilizing,and the notch impact strength shows a continuous upward trend.Among them,the S2 sample has the highest tensile strength,bending strength,and high notch impact strength,with values of 41.6 MPa,102.4 MPa,and 15.3 J/m^(2),respectively,which are 29.6%,10.7%,and 1.35 times higher than the corresponding parameters of the S0 sample.