表面处理纳米铜粉/PET共混物的流变性能

Rheological behavior of surface modified nano-copper powder/PET blends

采用硅烷偶联剂KH-550对纳米铜粉进行表面处理,通过熔融共混制备纳米铜粉/PET共混物,用毛细管流变仪研究了共混物的流变性能。结果表明:纳米铜粉/PET共混体系为非牛顿性假塑性流体,其表观黏度随着剪切速率的增大而减小;随着纳米铜粉含量增加,非牛顿指数增大;共混物的黏流活化能随剪切速率的增加而减小。

Nano-copper powder was exposed to surface modification in presence of a silane coupling agent, KH-550, and was prepared into nano-copper/PET blend by melt blending process. The theological behavior of the blend was studied by capillary rheometer. The results showed that the blend system was non-Newtonian pseudoplastic fluid, whose apparent viscosity decreased with the increase of shear rate; non-Newtonian index increased with the increase of nano-copper powder content; the viscose flow activation energy of the blend decreased with the increase of shear rate.