纳米铜粉/PP复合材料的流变性能及动态力学性能研究

Rheological behavior and dynamic mechanical properties of nano-copper powder/PP composite material

将纳米铜粉经硅烷偶联剂KH550处理后,按不同的配比与聚丙烯(PP)混合,经螺杆挤压制得纳米铜粉/PP复合材料,研究了纳米铜粉在PP复合材料中的分散性以及PP复合材料的流变性能和动态力学性能。结果表明:经改性后的纳米铜粉均匀分散在PP中;纳米铜粉/PP复合材料为非牛顿假塑性流体;在低剪切速率下,复合材料熔体的黏度高于纯PP的,随着纳米铜粉的含量增加,复合材料体系的表观黏度增大,高剪切速率时,纳米铜粉的添加量对复合材料的流动性能影响较小;当复合材料体系中纳米铜粉的质量分数小于或等于0.5%时,其熔体流动性能提高,储能模量小于纯PP的,当纳米铜粉质量分数大于0.5%时,其储能模量提高并高于纯PP的。

Nano-copper powder/polypropylene（PP） composite material was prepared by blending PP and nano-copper powder modified with silane coupling agent KH550 at different ratios prior to screw extrusion.The dispersion of nano-copper powder in PP composite material was studied,as were the rheological behavior and dynamic mechanical properties of PP composite material.The results showed that nano-copper powder uniformly dispersed in PP matrix after modification;nano-copper powder/PP composite material was non-Newtonian pseudoplastic fluid;the viscosity of the composite material melt was higher than that of pure PP at low shearing rate;the apparent viscosity of the composite material system was increased with the addition of nano-copper powder;the addition of nano-copper powder had a slight effect on the rheological behavior of composite material at high shearing rate;the flowability of the composite material melt was improved,the storage modulus was lower than that of pure PP when the addition of nano-copper powder was not more than 0.5% by mass fraction in the composite material system;and the storage modulus was higher than that of pure PP when the mass fraction of nano-copper powder was above 0.5%.