Faculty of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic.
Centre of Polymer Systems, Tomas Bata University in Zlín, 760 01 Zlín, Czech Republic.
Carbohydr Polym. 2023 Jun 1;309:120662. doi: 10.1016/j.carbpol.2023.120662. Epub 2023 Feb 8.
Combining highly conducting one-dimensional nanostructures of polypyrrole with cellulose nanofibers (CNF) into flexible films with tailored electrical conductivity and mechanical properties presents a promising route towards the development of eco-friendly electromagnetic interference shielding devices. Herein, conducting films with a thickness of 140 μm were synthesized from polypyrrole nanotubes (PPy-NT) and CNF using two approaches, i.e., a new one-pot synthesis consisting of in situ polymerization of pyrrole in the presence of structure guiding agent and CNF, and a two-step synthesis, in which CNF and PPy-NT were physically blended. Films based on one-pot synthesis (PPy-NT/CNF) exhibited higher conductivity than those processed by physical blending, which was further enhanced up to 14.51 S cm after redoping using HCl post-treatment. PPy-NT/CNF containing the lowest PPy-NT loading (40 wt%), thus the lowest conductivity (5.1 S cm), displayed the highest shielding effectiveness of -23.6 dB (>90 % attenuation), thanks to the good balance between its mechanical properties and electrical conductivity.
将高度导电的一维聚苯胺纳米结构与纤维素纳米纤维 (CNF) 结合到具有定制电导率和机械性能的柔性薄膜中，为开发环保型电磁干扰屏蔽设备提供了一条很有前途的途径。本文使用两种方法，即原位聚合法（在结构导向剂和 CNF 的存在下聚合吡咯）和两步合成法（将 CNF 和 PPy-NT 物理混合），从 PPy-NT 和 CNF 合成了厚度为 140 μm 的导电薄膜。一锅法合成的薄膜（PPy-NT/CNF）的电导率高于物理混合法处理的薄膜，经 HCl 后处理进一步掺杂后，电导率提高至 14.51 S cm。在 PPy-NT/CNF 中，PPy-NT 的负载量最低（40wt%），因此电导率最低（5.1 S cm），但由于其机械性能和电导率之间的良好平衡，其屏蔽效能最高为-23.6 dB（>90%衰减）。
