Dong Congcong, Guo Peng, Yuan Yue, Sun Changmei, Qu Rongjun, Ji Chunnuan, Zhang Ying, Wang Ying
School of Chemistry and Materials Science, Ludong University, Yantai, China.
Front Chem. 2020 Jan 17;7:939. doi: 10.3389/fchem.2019.00939. eCollection 2019.
Aramid nanofibers (ANFs) are a novel type of promising nanoscale building blocks for high-performance nanocomposites. Conventionally, ANFs are used to composite with polymers containing polar groups such as -OH and -NH since those polymers can interact with the amide groups in ANFs through polar-polar interaction such as hydrogen bonding. In this study, ANFs were derivatized with non-polar alkyl groups including ethyl, octyl and dodecyl groups and used as a performance-enhancing additive to polyvinyl chloride (PVC) with weak polarity. Interestingly, it was observed that the morphologies of the resulting alkyl-derivatized aramid nanomaterials (R-ANMs) varied significantly including nanofibers, nanobranches, nanosheets, and nanospheres, all of which depended on the degree of substitution () and the chain length of the alkyl group. As an additive, R-ANMs improved the Young's modulus, toughness and yield strength of the PVC films. This study proves the concept that ANFs can be used to composite weakly polar or non-polar polymers.
芳纶纳米纤维（ANFs）是一种新型的、有前景的用于高性能纳米复合材料的纳米级构建单元。传统上，ANFs用于与含有极性基团（如-OH和-NH）的聚合物复合，因为这些聚合物可以通过诸如氢键等极性-极性相互作用与ANFs中的酰胺基团相互作用。在本研究中，ANFs用包括乙基、辛基和十二烷基在内的非极性烷基进行衍生化，并用作弱极性聚氯乙烯（PVC）的性能增强添加剂。有趣的是，观察到所得烷基衍生化芳纶纳米材料（R-ANMs）的形态有显著变化，包括纳米纤维、纳米分支、纳米片和纳米球，所有这些都取决于取代度（）和烷基的链长。作为添加剂，R-ANMs提高了PVC薄膜的杨氏模量、韧性和屈服强度。本研究证明了ANFs可用于复合弱极性或非极性聚合物这一概念。
