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尼龙1212/聚乙烯/功能化聚乙烯反应性共混材料流变特性与力学性能相关性研究
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摘要
线性低密度聚乙烯接枝马来酸酐(LLDPE-g—MAH)和高密度聚乙烯接枝马来酸酐(HDPE-g-MAH)作为增容剂,与尼龙1212和聚乙烯共混制备了尼龙1212/聚乙烯/功能化聚乙烯共混材料,并对共混材料的力学性能、流变特性和微观形貌进行测定与分析,研究结果如下:LLDPE-g—MAH和HDPE-g-MAH的加入可以有效增容尼龙1212/聚乙烯共混材料,并使共混材料的冲击强度明显提高,共混材料的缺口冲击强度最高可达到92.09kJ/m~2。两种共混材料均在测试范围内出现凝胶点,与凝胶点对应的共混材料的冲击强度均大于其临近点共混材料的冲击强度,表明尼龙1212/聚乙烯/功能化聚乙烯共混材料流变特性与力学性能具有一定相关性,流变是确定尼龙1212/聚乙烯/功能化聚乙烯共混材料超韧配方的一种简单、快速、有效的实验方法。
HDPE-g-MAH and LLDPE-g-MAH as compatibilizers had been blended with nylon 1212 and polyethylene and prepared nylon 1212/PE/PE-g-MAH blends.The rheological characterization,mechanical properties and morphologies of blends had been investigated.Two compatibilizers can improve the compatibility of nylonl212/PE blends,and increase greatly the toughness of blends.The highest impact strength of blends attained to 92.09 kJ/m~2.Both of the blends exhibited obvious "gel points" in the test range,and the impact strength of blends corresponding to gel point were significantly greater than the near point.These results indicated the "gel points" acquired from the dynamic rheological data and the "super-toughness points" of the blends had a corresponding relationship.Thus,just by simple composition designs and a small amount of samples,the super-toughness point could be conveniently determined by the dynamic rheological measurements.
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