负载法原位制备MWCNTs/PE复合材料的结构与性能

摘要

通过多壁碳纳米管负载催化剂原位催化乙烯聚合制备多壁碳纳米管/聚乙烯(MWCNTs/PE)纳米复合材料.借助场发射扫描电镜、拉曼光谱、示差扫描量热仪、热失重分析仪等表征手段和力学性能测试研究了该复合材料的结构与性能.结果表明,与纯聚乙烯相比,通过原位聚合法在只加入0.2％ MWCNTs时,获得的纳米复合材料的拉伸强度和断裂伸长率分别增加到1.6倍(从29MPa增加到45Mpa)和1.5倍(从909％增加到1360％).拉伸断面的SEM照片证明聚乙烯能够牢固地黏结到MWCNTs的表面,与拉曼光谱测试的结果相一致,这也是材料力学性能显著提高的一个主要原因.材料的热稳定性也有较大提高.%Multi-walled carbon nanotubes (MWCNTs)/PE composites were prepared via in situ polymerization with MWCNTs supported catalyst. With the field emission scanning electron microscopy, Raman" spectroscopy, DSC, thermo gravimetric analyzer and other characterization methods and mechanical testing, the structure and properties of the composites were studied. With only introducing 0. 2 wt% MWCNTs by insitu polymerization, both the tensile strength and elongation at break of nano-composite were increased by factors of 1. 6 times (from 29 MPa to 45 MPa) and 1.5 times (from 909% to 1360% ) comparing with the pure PE, respectively. SEM of fractured surface, in accordance with the Raman results, revealed that the PE firmly adhered to the surface of MWCNTs, which was responsible for the significant improvement of the mechanical properties of nano-composites. In addition, the thermal stabilities of the composites were significantly improved.