Keinänen Pasi, Das Amit, Vuorinen Jyrki
Tampere University of Technology, Laboratory of Materials Science P.O. Box 527, FI-33101 Tampere, Finland.
Leibniz Institute of Polymer Research Dresden, P.O. Box 120 411, D-01005 Dresden, Germany.
Materials (Basel). 2018 Sep 23;11(10):1806. doi: 10.3390/ma11101806.
Post-treatment removal of dispersion agents from carbon nanotube/rubber composites can greatly enhance the mechanical properties by increasing the filler⁻matrix interaction. In this study, multiwall carbon nanotubes (MWNT) were dispersed in water by sonication and nonionic surfactant, octyl-phenol-ethoxylate was used as a dispersion agent. The dispersed MWNTs were incorporated in thermo-reactive acrylonitrile butadiene rubber (NBR) latex and nanocomposite films were prepared by solution casting. As a post-treatment, the surfactant was removed with acetone and films were dried in air. Dispersion quality of the colloid before casting was determined, and mechanical, electrical and thermal properties of the composites before and after the acetone post-treatment were studied. It was found that removal of dispersion agent increased the storage modulus of films between 160⁻300% in all samples. Relative enhancement was greater in samples with better dispersion quality, whereas thermal conductivity changed more in samples with smaller dispersion quality values. Electrical properties were not notably affected.
在碳纳米管/橡胶复合材料中，后处理去除分散剂可通过增强填料与基体之间的相互作用来极大地提高其机械性能。在本研究中，多壁碳纳米管（MWNT）通过超声处理分散于水中，并使用非离子表面活性剂辛基酚聚氧乙烯醚作为分散剂。将分散的MWNT掺入热反应性丙烯腈丁二烯橡胶（NBR）胶乳中，并通过溶液浇铸制备纳米复合薄膜。作为后处理步骤，用丙酮去除表面活性剂，并在空气中干燥薄膜。测定了浇铸前胶体的分散质量，并研究了丙酮后处理前后复合材料的机械、电学和热性能。结果发现，去除分散剂后，所有样品薄膜的储能模量提高了160%至300%。在分散质量较好的样品中，相对增强幅度更大，而在分散质量值较小的样品中，热导率变化更大。电学性能未受到显著影响。
