用旋转流变仪测试了三元共混物PP EPS 30RA/HDPE 8916/EPDM和PP T30S/HDPE 5306/EPDM的动态流变行为,采用广义Maxwell模型对损耗模量-角频率曲线进行了拟合.结果表明,低频下,随着PP/HDPE质量比的增加,2种共混物的复数黏度逐渐增加,而储能模量值先增加后下降,最大值对应的PP/HDPE质量比为70/30.当PP EPS 30RA/HDPE 8916/EPDM三元共混物各组分质量比分别为30/70/3、50/50/3和70/30/3时,储能模量在低频下均出现第二平台,而PP T30S/HDPE 5306/EPDM共混物未出现该现象.在PP/HDPE/EPDM质量比达到50/50/3后,2种PP/HDPE/EPDM共混物的特征松弛时间逐渐变长.2种共混物的松弛模量-松弛时间曲线呈“扫把”状,模量高时松弛时间聚集,模量较低时松弛时间发散.
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