In the present work, the morphology and the electrical and thermal conduction properties of co-continuous poly(vinylidene fluoride) (PVDF), maleated polypropylene (PPgMA) and multiwall carbon nanotubes (CNT) nanostructured blends are investigated. CNT preferentially locates in the PPgMA phase and clearly causes a refinement in the co-continuous structure. Electrical conductivity experiments show that nanocomposites are well above the percolation threshold and evidence for one order of magnitude enhancement in conductivity for the co-continuous nanocomposites compared to the monophasic nanocomposites with the same CNT volume fraction. On the other hand, thermal diffusivity enhancement for the co-continuous blends is found lower than that for the monophasic nanocomposites at the same CNT volume fraction. An explanation is proposed in terms of large interfacial area, causing phonon scattering at the interface between immiscible PVDF and PPgMA domains. Results described in this paper open the way to the preparation of high electrical and low thermal conductivity materials with possible application as thermoelectrics.

在本工作中，研究了共连续聚偏二氟乙烯（PVDF），马来酸化聚丙烯（PPgMA）和多壁碳纳米管（CNT）纳米结构共混物的形貌以及导电和导热性能。CNT优先位于PPgMA相中，并明显引起共连续结构的细化。电导率实验表明，纳米复合材料远高于渗透阈值，并且与具有相同CNT体积分数的单相纳米复合材料相比，共连续纳米复合材料的电导率提高了一个数量级。另一方面，发现在相同的CNT体积分数下，共连续共混物的热扩散率增强低于单相纳米复合物的热扩散率增强。提出了一种关于较大界面面积的解释，该界面面积导致声子在不混溶的PVDF和PPgMA域之间的界面处散射。本文描述的结果为制备高电导率和低导热率的材料开辟了道路，并可能将其用作热电材料。