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以聚氨酯(PU)预聚体为基体,以镀银纳米石墨为导电填料,采用共混法制备PU/镀银纳米石墨导电胶,并与PU/纳米石墨导电胶进行电学性能、力学性能和热稳定性能对比。结果表明:PU/镀银纳米石墨导电胶和PU/纳米石墨导电胶的导电渗流阈值分别为3%和9%,此时对应的电导率分别为0.044 S/cm和0.012 S/cm;前者的力学性能(最大剪切强度为5.76 MPa)高于后者(最大剪切强度为3.65 MPa),并且前者的起始分解温度比后者提高了近10℃,说明前者的应用前景比后者更广阔。
Polyurethane (PU) prepolymer was used as substrate, silver plated nano-graphite was used as conductive filler, and PU / silver-coated nano-graphite conductive paste was prepared by blending method. The electrical properties, mechanical properties and thermal properties of PU / nano-graphite conductive paste Stability comparison. The results show that the conductive seepage thresholds of PU / silver-plated nano-graphite conductive paste and PU / nano-graphite conductive paste are 3% and 9%, respectively, at which the corresponding conductivities are 0.044 S / cm and 0.012 S / cm respectively. Mechanical properties (the maximum shear strength of 5.76 MPa) is higher than the latter (maximum shear strength of 3.65 MPa), and the former decomposition temperature increased by nearly 10 ℃ than the latter, indicating that the application of the former than the latter broad.