多壁碳纳米管/聚丙烯复合材料热导率研究

用Pt细丝代替已有3ω方法中的薄膜热线，并设计了基于Labview程序的虚拟测量系统，准确、方便地测量了聚丙烯复合材料的热导率. 测量结果发现，多壁碳纳米管/丁苯橡胶/聚丙烯三元复合材料的热导率随着多壁碳纳米管/丁苯橡胶粉末含量的增加变化不大；多壁碳纳米管/聚丙烯复合材料的热导率随着多壁碳纳米管含量增加而增大；复合材料热导率远小于简单混合规则预测的结果，而与有效介质理论符合很好.关键词：ω法')" href="#">3ω法多壁碳纳米管聚丙烯复合材料热导率

A study on the thermal conductivity of multiwalled carbon nanotube/polypropylene composite

A convenient 3ω method was developed to measure the thermal conductivity of multiwalled carbon nanotube/polypropylene （MWCNT/PP） composite，in which the metal strip heater was substituted for a platinum wire，and the commercial lock-in amplifier was replaced by a Labview-based virtual measurement system. The experimental result showed that，the thermal conductivity of multiwalled carbon nanotube/styrene-butadiene rubber/polypropylene （MWCNT/SBR/PP） ternary composite varied slightly with MWCNT/SBR powder loading; the thermal conductivity of MWCNT/PP composite increased with the increasing MWCNT loading; the composite thermal conductivity was far less than that expected from the law of mixtures，but in good agreement with the effective medium approach by incorporating the thermal interfacial resistance between the MWCNT and the surrounding polymer matrix.