Liu Mingxian, Guo Baochun, Zou Quanliang, Du Mingliang, Jia Demin
Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China.
Nanotechnology. 2008 May 21;19(20):205709. doi: 10.1088/0957-4484/19/20/205709. Epub 2008 Apr 15.
Many types of clay tend to absorb organics via electron transferring interactions between the clay and the organics. This may be utilized to design clay incorporated polymer composites with better interfacial properties. In the present paper, 2,5-bis(2-benzoxazolyl) thiophene (BBT), capable of donating electrons, is selected as the interfacial modifier for polypropylene (PP)/halloysite nanotube (HNTs) composites. The electron transfer between HNTs and BBT are confirmed. The mechanical properties and the unique morphology of the nanocomposites are examined. Formation of fibrils of BBT in the presence of HNTs is found in the nanocomposites. The chemical composition of the fibrils in the nanocomposites is found to be composed of largely BBT and a small amount of HNTs. The formation mechanism of BBT fibrils are elucidated to be the strong interactions between BBT and HNTs under melt shearing. The formation of the BBT fibrils leads to much higher crystallinity compared with previously reported PP nanocomposites. The nanocomposites with BBT show substantially increased tensile and flexural properties, which are attributed to the enhanced crystallinity of the nanocomposites.
许多类型的黏土倾向于通过黏土与有机物之间的电子转移相互作用来吸附有机物。这可用于设计具有更好界面性能的黏土增强聚合物复合材料。在本文中，能够提供电子的2,5-双（2-苯并恶唑基）噻吩（BBT）被选作聚丙烯（PP）/埃洛石纳米管（HNTs）复合材料的界面改性剂。证实了HNTs与BBT之间的电子转移。研究了纳米复合材料的力学性能和独特形态。在纳米复合材料中发现了在HNTs存在下BBT原纤维的形成。发现纳米复合材料中原纤维的化学组成主要由BBT和少量HNTs组成。阐明了BBT原纤维的形成机制是在熔体剪切作用下BBT与HNTs之间的强相互作用。与先前报道的PP纳米复合材料相比，BBT原纤维的形成导致更高的结晶度。含有BBT的纳米复合材料的拉伸和弯曲性能大幅提高，这归因于纳米复合材料结晶度的提高。
