低熔点金属/聚乙烯复合体系的密炼加工行为及导电性能

Internal Mixing Behavior and Electrical Conductivity of Low-Melting-Point Metals/Polyethylene Composites

通过密炼机将低熔点金属与聚乙烯熔融混合;研究了复合体系中金属粒子的尺寸与混合时间、转子转速、金属含量之间的关系,以及这些因素对复合材料体积电阻率的影响。结果表明,当金属的体积分数高于0.65%或混合时间超过5min时,可观察到金属液体聚集析出;当金属的体积分数为0.65%且混合时间为5 min时,金属液体聚集析出不明显。金属粒子尺寸随混合时间延长而先减小、再增大;随转子转速增加而先减小、然后趋于稳定;随金属含量增加而先增大后减小。复合材料的体积电阻率也受上述三个因素的影响,但密炼时间、转子转速对体积电阻率的影响应归咎于金属粒径的影响。

The low melting point metals （SnCu alloy and Sn ） and HDPE were mixed through the internal mixer. The effects of mixing time, rotary speed and Sn content on average diameter of Sn particles and volume resistivity were studied. It is found that low-melting-point metals assemble and separate out partly in the case of metal volume fraction above 0.65 % or mixing time above 5 min. When metal volume fraction is 0.65 % and mixing time is 5 rain, the assembling becomes unobvious. The average diameter of Sn particles in composite decreases early and then increases with the increase of mixing time, decreases early and then becomes invariant with the rotary speed increasing, and increases early and then decreases with the Sn content increasing. These factors also affect the volume resistivity of Sn/HDPE composite, but the effects of mixing time and rotary speed on volume resistivity are attribute to the effect of Sn particles size in composites.