包装论文：短碳纤维增强改性聚丙烯的研究

摘  要

本文研究了短碳纤维（CF）增强改性聚丙烯（PP）。比较了2mm、3mm和4mm长度的短碳纤维增强聚丙烯的拉伸强度和表面电阻率，通过对试验数据进行分析，确定了用3mm长的短碳纤维来增强改性聚丙烯，此CF/PP复合材料的拉伸强度的最大值为54.5MPa，表面电阻率最低为7.0 lgN/Ω。同时，在本论文中对短碳纤维含量分别为10%、20%、30%、40%的CF/PP复合材料的力学性能、流变性能和电学性能进行了测试与分析。实验结果表明：CF/PP复合材料中的短碳纤维的含量为30%时，其拉伸强度为51.5Mpa，弯曲强度为53.8Mpa，拉伸强度和弯曲强度都高于没有改性的聚丙烯的拉伸强度（为33.0Mpa），弯曲强度(为42.0Mpa)。此时，无缺口冲击强度为90Mpa，略低于没有改性的聚丙烯（100Mpa）。用短碳纤维增强改性的聚丙烯的表面电阻率为7.5 lgN/Ω，体积电阻率为7.0 lgN/Ω，都低于没有进行改性的聚丙烯的表面电阻率（为15.8 lgN/Ω），体积电阻率（为16.0 lgN/Ω），即复合材料的导电性能是随着碳纤维的含量增加而增加的。CF/PP复合体系的熔体表观粘度随着剪切速率的增大而下降的。

关键词：聚丙烯；短碳纤维；增强改性；表面处理；偶联剂
ABSTRACT

It was researched that the shorter carbon fiber(CF) modified and strengthen polypropylene(PP) in this paper. The reinforcing polypropylene in terms of tensil strength and surface resistivity which were prouced by the short carbon fiber at the length of 2mm, 3mm and 4mm respectively were compared. By analyzing these experimental data, it was determined that the short carbon fiber should be used in reinforcing and modifying polypropylene. The maximum of the tensil strength of this CF/PP compound was 54.5MPa, and its minimum of the surface resistivity was 7.0lgN/Ω. Meanwhile, the mechanical, rheological and electrical properties of this CF/PP compound, whose short carbon fiber content were 10%、20%、30% and 40% respectively, was also tested and analyzed. The results showed that when the short carbon fiber content of the CF/PP compound was 30%, the tensil strength was 51.5 Mpa, and bending strength 53.8Mpa. Both were higher than those of the non-modified polypropylene, whose tensil strength was 33.0Mpa, and bending strength 42.0 Mpa. In this case, the non-notched impact strength was 90Mpa, less than that of the non-modified polypropylene with 100Mpa. The reinforcing and modified polypropylene produced by the short carbon fiber had its surface resistivity reach to 7.5lgN/Ω, and volume resistivity to 7.01gN/Ω. Both were lower than those of the non-modified polypropylene, with its surface resistivity to be 15.81gN/Ω, and volume resistivity 16.0 lgN/Ω. Then, the conductivity of the composite increased as the carbon fiber content did. However, when the sharing rate increased, the apparent melt viscosity of the CF/PP compound system decreased.

Keywords: Polypropylene, Short carbon fiber, Strengthen to modify, Surface processing, resin acceptor

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