Properties and morphology of polyamide 6 hybrid composites containing potassium titanate whisker and liquid crystalline copolyester
Properties and morphology of polyamide 6 hybrid composites containing potassium titanate whisker and liquid crystalline copolyester
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DOI：
10.1016/s0032-3861(98)00340-1
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发表时间：
1999-03
期刊：
影响因子：
4.6
通讯作者：
S. Tjong;Y. Meng
中科院分区：
文献类型：
--
作者：
S. Tjong;Y. Meng
在双螺杆挤出机中制备钛酸钾晶须 (K2Ti6O13) 和液晶聚合物 (LCP) 增强的聚酰胺 6 (PA6) 杂化复合材料，然后注射成型。在混合之前用原钛酸四丁酯对晶须进行表面处理。静态拉伸测量表明，复合材料的拉伸强度和模量往往随着晶须含量的增加而增加。然而，艾佐德冲击试验表明，当晶须含量添加至10wt%时，杂化复合材料的冲击强度变化不大，此后冲击功随着晶须含量的增加而明显下降。扫描电镜观察表明，晶须含量<10wt%的杂化复合材料的表层部分形成定向LCP原纤维，而晶须含量≥15wt%的杂化材料的表层部分则分散有球形液滴。扭矩测量表明，LCP 在降低 PA6/K2Ti6O13 复合材料的熔体粘度方面非常有效。最后，热重分析表明，晶须含量较高的杂化复合材料表现出良好的耐热性能。讨论了两种增强材料对这些混合复合材料的机械性能和相容性的混合影响。
Polyamide 6 (PA6) hybrid composites reinforced with potassium titanate whiskers (K2Ti6O13) and liquid crystalline polymer (LCP) were prepared in a twin-screw extruder followed by injection moulding. The whiskers were surface treated with tetrabutyl orthotitanate prior to blending. Static tensile measurements showed that the tensile strength and modulus of the composites tend to increase with increasing whisker content. However, Izod impact tests indicated that the hybrid composites show little variation in the impact strength with the addition of whisker content up to 10wt%, thereafter the impact energy shows an obvious decrease with increasing whisker content. Scanning electron microscopic observations revealed that the oriented LCP fibrils were formed in the skin section of hybrid composites containing whisker content <10wt%, whilst spherical droplets were dispersed in the skin section of hybrids containing whisker content ≥15wt%. Torque measurements showed that the LCP is very effective in reducing the melt viscosities of PA6/K2Ti6O13composites. Finally, thermogravimetric analysis showed that the hybrid composites with higher whisker content exhibit good heat resistance properties. The hybrid effects of the two reinforcements on the mechanical properties and compatibility of these hybrid composites are discussed.