Conductive naturalrubber/carbon black nanocomposites via cellulose nanowhisker templatedassembly: tailored hierarchical structure leading to synergistic propertyenhancements
Conductive naturalrubber/carbon black nanocomposites via cellulose nanowhisker templatedassembly: tailored hierarchical structure leading to synergistic propertyenhancements
复制标题
通过纤维素纳米晶须模板组装的导电天然橡胶/炭黑纳米复合材料：定制的分层结构导致协同性能增强
DOI：
10.1039/c5ta02601f
复制
发表时间：
2015
影响因子：
11.9
通讯作者：
Zhou Zehang
中科院分区：
文献类型：
--
作者：
Wu Xiaodong;Lu Canhui;Zhang Xinxing;Zhou Zehang
开发新的、通用的策略来构建具有低渗流阈值和高力学性能的导电聚合物复合材料具有重要意义。本工作以可再生、可生物降解的纤维素纳米晶须(CNS)为模板，开发了一种简单、方便、有效的方法在天然橡胶(NR)中制备了基于定制炭黑(CB)的三维分层导电结构。具体地说，针状CNS可以引导CB纳米粒子沿CNS排列，得到具有优异悬浮稳定性和高长径比的结节状CB@CN纳米杂化材料。因此，CB@CN纳米杂化材料可以选择性地定位在天然橡胶胶乳微球之间的间隙中，并通过胶乳共混技术组装成连续的3D分级网络。这种三维分层导电结构显著提高了天然橡胶基复合材料的电性能和力学性能。CN模板剂的加入使复合材料的电导率提高了12个数量级，拉伸强度提高了760%。此外，CB@CNS/NR纳米复合材料的电导渗流阈值(2.9%)远低于传统制备的CB/NR复合材料(7.3%)。这种以碳纳米管为模板在聚合物基质中制备有效的三维导电结构的新策略，可以极大地促进天然纤维素资源的功能利用，扩大碳纳米管在导电复合材料生产中的应用。
The development of novel and versatile strategies to construct conductive polymer composites with low percolation thresholds and high mechanical properties is of great importance. In this work, a simple, facile and effective strategy was developed to fabricate tailored carbon black (CB) based 3D hierarchical conductive structures in a natural rubber (NR) matrix using renewable and biodegradable cellulose nanowhiskers (CNs) as templates. Specifically, needle-like CNs can direct the arrangement of CB nanoparticles along the CNs, yielding nodular CB@CN nanohybrids with excellent suspension stability and high aspect ratios. As a result, CB@CN nanohybrids could be selectively located in the interstitial space between NR latex microspheres and assembled into a continuous 3D hierarchical network via a latex blending technique. This 3D hierarchical conductive structure dramatically enhanced the electrical and mechanical properties of the NR based composites. With the addition of 5 vol% CB, the electrical conductivity of the composite was significantly enhanced by 12 orders of magnitude and the tensile strength was increased by 760% after the incorporation of the CN templates. Moreover, CB@CNs/NR nanocomposites showed a much lower electrical conductivity percolation threshold (2.9 vol%) than the traditionally prepared CB/NR composites (7.3 vol%). This novel strategy of CN templated fabrication of effective 3D conductive structures in a polymer matrix could significantly promote the functional use of natural cellulose resources and extend the application of CB in the production of conductive composites.