采用双螺杆熔融共混的方法制备了含三羟甲基丙烷三丙烯酸酯(TMPTA)的聚对苯二甲酸乙二酯/氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(PET/SEBS)和聚对苯二甲酸乙二酯/马来酸酐接枝氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(PET/SEBS-g-MAH)共混材料,并在Co-60源中对其进行辐照.通过对共混材料的力学性能、相态结构测和凝胶含量分析,对比研究了辐射对以上2种共混材料结构及性能的影响.扫描电子显镜观察和凝胶含量分析结果表明,在适量TMPTA存在时,辐射有效地改善了PET/SEBS体系的相容性.冲击强度的变化证实了这种增容效应,当SEBS的质量分数为20%、TMPTA质量分数为1%,经50 kGy辐照后,冲击强度达到17.3 kJ/m2.当在SEBS分子链上引入马来酸酐官能团,辐照后,体系的相态结构变化并不明显,冲击强度最大值仅为11.5 kJ/m2,明显低于不含马来酸酐官能团的体系.
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