掺混型ABS树脂特征及其对PC/ABS合金结构与性能的影响

BLENDING ABS RESIN AND ITS EFFECT ON STRUCTURE AND PROPERTIES OF PC/ABS BLEND ALLOY

制备了不同含胶量和AN含量的掺混型ABS树脂,并将其与PC进行熔融共混得到PC/ABS(70/30)合金,研究了含胶量、AN含量及PC分子量对PC/ABS合金结构与性能的影响.结果表明,当AN含量固定时,含胶量为6.3 wt%的PC/ABS(70/30)合金均表现出最好的拉伸性能;而AN含量的增加,使得PC/ABS合金的拉伸性能有所提高;含胶量对PC/ABS合金结构与性能的影响更为显著,且其基本规律不因AN含量的变化而发生根本性改变;PC/ABS合金中含胶量和胶中AN含量变化所导致的合金分散相形态和热力学相容性的变化规律与其对合金拉伸性能的变化特征结果一致;含胶量与AN含量的变化对PC/ABS合金的热稳定性影响不明显;PC/ABS合金拉伸性能对合金中的PC分子量依赖性显著,分子量从1.5×104增加为2.5×104时,其拉伸强度和断裂伸长率分别提高35%和98%.

Blending type ABS resin with different polybutadiene rubber （PB） and polyaerylonitrile （AN） contents is prepared by melt blending,and used in preparing PC/ABS （70/30） blends. The effects of the PB and AN contents in SAN phase and the PC molecular weight on the structure and properties of blending PC/ ABS systems are investigated. The results show that：when the AN contents were fixed, samples with 6.3 wt% of PB content exhibited the best tensile properties; while the PB contents were fixed,increasing AN contents led to the better tensile properties of PC/ABS （70/30） blends, although its effect on the structure and properties of PC/ABS blends was not as significant as that of PB contents. And basic law in the tensile properties of PC/ABS blends with the PB content changes does not change fundamentally with the AN contents change. Dynamic mechanical analysis and scanning electron microscopy give exactly the same trends of thermodynamic compatibility （PC-ABS） and phase morphology with PB and AN contents. Therefore, the influences of PB and AN contents on the tensile properties of PC/ABS blends can be well understood. The changes on thermal stability of PC/ABS blends with the PB contents and AN contents change are not obvious. The tensile properties of PC/ABS blends have a significant dependence on the PC molecular weight,and when the PC molecular weight increased from 1.5 ×10^4 to 2.5×10^4 its tensile strength and elongation at break were increased by 35% and 98% ,respectively.