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- 2018
蒙脱土-SiO2/低密度聚乙烯复合材料结晶行为及电树枝化特性
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Abstract:
为了进一步改善低密度聚乙烯（LDPE）的耐电树枝化性能，以有机化蒙脱土（MMT）和表面改性的SiO2为纳米填料，采用熔融共混法制备了MMT-SiO2/LDPE多元复合材料。利用FTIR表征了纳米填料与LDPE基体间分子链相互作用。研究了纳米MMT和SiO2对LDPE结晶行为、结晶形态及耐电树枝化性能的影响。结果表明：纳米MMT和SiO2均通过改性剂长链与LDPE基体分子链以物理纠缠的形式混合在LDPE中。纳米SiO2异相成核形成小的晶体结构，与分散在无定形区的纳米MMT均对电树枝的发展具有阻挡作用，二者相互协同使MMT-SiO2/LDPE多元复合物材料中电树枝的发展路径更加曲折，因此MMT-SiO2/LDPE多元复合物材料耐电树枝性能优于MMT/LDPE和SiO2/LDPE复合材料。 In order to further improve the electrical tree resistance of low density polyethylene (LDPE), montmorillonite (MMT)-SiO2/LDPE multi-element composite was prepared by melt blending with the organic MMT and surface modified SiO2 as the inorganic nanofiller. The molecular chain interaction of filler and LDPE matrix was characterized by FTIR. The effects of inorganic fillers on crystallization behavior, crystallization morphology and the electrical tree resistance property of LDPE were investigated. The research results indicate that inorganic fillers are mixed in LDPE in the form of physical entanglement through the long chain of modifier and LDPE matrix. The heterogeneous nucleation of nano-SiO2 forms small crystal structure which impedes the development of electrical trees, the MMT dispersed in amorphous region has a blocking effect on the development of electrical trees. The combination makes the development path of the electrical trees in the MMT-SiO2/LDPE multi-element composite more torturous, resulting in the electrical tree resistance of the MMT-SiO2/LDPE multi-element composite being better than MMT/LDPE and SiO2/LDPE composites. 国家自然科学基金（51577045）
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