Movable cross-linked elastomer with aligned carbon nanotube/nanofiber as high thermally conductive tough flexible composite
Movable cross-linked elastomer with aligned carbon nanotube/nanofiber as high thermally conductive tough flexible composite
复制标题
DOI：
10.1016/j.compscitech.2020.108009
复制
发表时间：
2020-04-12
影响因子：
9.1
通讯作者：
Terashima, Kazuo
中科院分区：
文献类型：
--
作者：
Goto, Taku;Ito, Tsuyohito;Terashima, Kazuo
导热柔性材料必须与柔性电子器件在机械上兼容。它们必须具有低杨氏模量，高抗拉强度和韧性，以及高导热性。这些要求促使研究人员开发柔性橡胶与大量高导热碳纤维/纳米管结合的复合材料。然而，由于橡胶与碳纤维/纳米管之间的亲和力差以及碳纤维/纳米管周围聚合物基体中的局部应力集中，这种复合材料变得脆性。为了降低这种脆性并实现高导热性，本文描述了包含滑环（SR）材料和等离子体表面改性碳纳米纤维(CNF)/碳纳米管（CNT）的复合材料，这些材料通过施加电场排列。在等离子体表面修饰CNF复合材料中加入少量的等离子体表面修饰CNTs与这些碳材料的电场排列产生明显的协同效应，有利于导热系数的提高。此外，虽然这种复合材料含有45 wt% CNF和5 wt% CNT，但韧性和抗拉强度并不低于原始sr。这种复合材料具有与某些金属相似的导热性，弹性体典型的低杨氏模量和高抗拉强度。
Thermally conductive flexible materials must be mechanically compatible with flexible electronic devices. They must have a low Young's modulus, high tensile strength, and toughness, in addition to a high thermal conductivity. These requirements have motivated researchers to develop composites of flexible rubber combined with a large amount of high thermally conductive carbon fibers/nanotubes. However, such composites become brittle because of the poor affinity between the rubber and carbon fibers/nanotube and local stress concentrations in the polymer matrix around the carbon fibers/nanotubes. Herein, to reduce this brittleness and achieve a high thermal conductivity, composite materials containing a slide-ring (SR) material and plasma-surface modified carbon nanofiber (CNF)/carbon nanotube (CNT) aligned via the application of an electric field are described. The addition of a small amount of plasma-surface-modified CNTs to plasma-surface-modified CNF composites and the electric field alignment of these carbon materials produces a clear synergistic effect, facilitating an increase in the thermal conductivity. Furthermore, although this composite contains 45 wt% CNF and 5 wt% CNT, the toughness and tensile strength are no lower than in the case of raw SR. This composite material has a thermal conductivity similar to that of some metals, a low Young's modulus typical of elastomers, and a high tensile strength.