HIPS/EVA/CB体系的相容性

研究了炭黑(CB)对高抗冲聚苯乙烯(HIPS)/乙烯-乙酸乙烯酯共聚物(EVA)共混体系相容性的影响,并预测了共混体系的相形态转变点。填充CB后,当EVA用量大于50 phr时,碳氧双键伸缩振动峰的位置由1 737.9cm~(-1)偏移到1 706.5 cm~(-1)附近,且在1 240.0 cm~(-1)附近的碳氧单键峰减弱,近乎消失。采用半经验公式对共混体系进行理论预测,HIPS/EVA/CB共混体系理论上发生相形态转变时,HIPS的临界质量分数为50%～60%,经傅里叶变换红外光谱和扫描电子显微镜照片分析,共混体系发生相形态转变时,HIPS的质量分数约为42%。

Miscibility of HIPS/EVA/carbon black blends

This paper studied the effects of carbon black(CB)on miscibility of high impact polystyrene/ethylene-vinyl acetate copolymer(HIPS/EVA)and predicted the phase morphological transition of the blending system.In the case of introducing CB and keeping EVA content over 50 phr,the stretching vibration peak of carbon- oxygen double bond shifted from 1 737.9 cm~(-1) to a position in vicinity of 1 706.5 cm~(-1) and furthermore,the peak intensity of carbon-oxygen single bond weakened or even disappeared approximately.A theoretical pre- diction was put forth to the blending system in accordance.with a semi-empirical formula,i.e.,the critical mass of HIPS was 50%-60% by mass fraction when phase morphological transition occurred theoretically in the blend of HIPS/EVA/CB.The analyses of Fourier transform infrared spectroscopy and scanning electron microscopy verified that the actual critical mass fraction of HIPS was 42% when the phase transition ap- peared in the blending system.