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采用一种无Pd无SnCl2化学镀Ag新工艺对空心玻璃微珠(HGB)表面进行化学镀Ag,然后通过熔融共混方法制备镀Ag玻璃微珠(Ag-GB)-膨胀石墨(EG)/聚氯乙烯(PVC)复合材料。借助SEM、EDS和XRD测试手段对Ag-GB镀层的表面形貌与结构进行了表征,研究了Ag-GB和EG作为复合填料对Ag-GB-EG/PVC复合材料导电和力学性能的影响。结果表明:预处理的HGB的表面更易于Ag层的沉积,镀覆的镀层更为均匀、致密;Ag-GB表面的Ag层质量分数为81.15%;固定Ag-GB的质量分数为15%,随着EG质量分数的增加,Ag-GB(15%)-EG/PVC复合材料的体积电阻率呈非线性降低趋势,当EG的质量分数达到逾渗阈值12%时,Ag-GB(15%)-EG/PVC复合材料的体积电阻率为2.18×10~3Ω·cm,满足抗静电PVC材料的应用要求。添加质量分数为12%的EG,Ag-GB(15%)-EG/PVC复合材料的体积电阻率与单独填充质量分数为50%的Ag-GB时Ag-GB/PVC复合材料的体积电阻率相当,此时其拉伸强度达到最大值。
The surface of hollow glass beads (HGB) was electroless plated with a Pd-free, Sn-free, SnCl2-free electroless Ag plating process. Ag glass beads (Ag-GB) Polyvinyl chloride (PVC) composite materials. The surface morphology and structure of Ag-GB coating were characterized by means of SEM, EDS and XRD. The effects of Ag-GB and EG as composite filler on the electrical and mechanical properties of Ag-GB-EG / PVC composites were studied. The results show that the surface of the pretreated HGB is more easily deposited on the Ag layer, the coating is more uniform and dense, the Ag layer content is 81.15%, the Ag-GB content is 15% With the increase of EG content, the volume resistivity of Ag-GB (15%) - EG / PVC composites decreases nonlinearly. When the mass fraction of EG reaches 12% of the percolation threshold, the volume resistivity of Ag- ) -EG / PVC composite volume resistivity of 2.18 × 10 ~ 3Ω · cm, to meet the application requirements of anti-static PVC material. The volume resistivity of EG, Ag-GB (15%) - EG / PVC composites with mass fraction of 12% and volume resistivity of Ag-GB / PVC composites with 50% The tensile strength reaches its maximum at this time.