High Performance and Reprocessable In Situ Generated Nanofiber Reinforced Composites Based on Liquid Crystal Polyarylate

Abstract

Polymers are playing important roles in the rapid development of triboelectric nanogenerators (TENGs). However, most polymers cannot meet the high requirements of thermomechanical performance. Thus, various polymeric composites have been developed for triboelectric layer. These composites are hardly recycled since their reinforcements are unevenly distributed after reprocessing, which limits the sustainable development of TENGs. To solve above challenges, in situ generated nanofiber reinforced composites (NFRCs) based on single‐component liquid crystal polyarylate (LCP) are designed and prepared via a one‐step polycondensation. Nonlinear naphthalene (NDA) widened the processing window of LCP without destabilizing liquid crystal phase. The NDA‐rich domains act as matrix while the NDA‐poor domains with higher rigidity form oriented nanofibers to achieve self‐reinforcement. The resultant NFRCs possess high glass transition temperature (Tg > 220 °C) and storage modulus (E’ = 0.1 GPa at 350 °C), which are far beyond existing triboelectric polymers, typically Tg < 110 °C and E’ < 0.1 MPa (flowable) at 350 °C. Furthermore, NFRC based TENG exhibits superior electrical output performance and retention rate (> 90%) after reprocessing. Overall, this work offers a new design principle to prepare self‐reinforced composites, which paves a way to explore high performance materials.This article is protected by copyright. All rights reserved

Thermoplastic Liquid-Crystal Polyarylate Nanofiber with an Ultrahigh Aspect Ratio

“…Furthermore, the visual characteristics of the PAR nanofiber membranes fabricated using different dispersing liquids exhibited significant disparities. As depicted in Figure c, the improved dispersion of PAR nanofibers in the ODCB reduced fiber entanglement, resulting in better transmittance and surface uniformity in the resultant fiber membranes. − …”