Developing a High-Temperature-Resistant Water-Soluble Sizing Agent via Sulfonation Site Regulation Strategy: Toward Enhanced Interfacial Properties in CF/PPESK Composites

作者：Zhenghui Liu, Qingguang Bao, Shanshan Cheng, Qingfeng Sun, Jingyao Feng, Ning Wang, Nan Li, Xigao Jian · 发表于：Industrial & Engineering Chemistry Research · 年份：2025 · DOI：10.1021/acs.iecr.5c04293 · 被引用次数：1 · 研究领域：Fiber-reinforced polymer composites、Polymer composites and self-healing、Tribology and Wear Analysis

This study achieved precise sulfonation site control in PPBESK resins by fixing the sulfone/ketone(DCS/DFK) ratio to 8:2 and adjusting the biphenol (BP) content. Results revealed a strong dependence of the sulfonation degree on the BP content, which allowed for a programmable sulfonation process through a molecular design strategy. A water-soluble, high-temperature polymer (SPPBESK) was synthesized as a carbon fiber sizing agent. Fourier transform infrared spectroscopy (FT-IR) and 1 H NMR confirmed the structure, while X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) showed enhanced CF surface activity and roughness. The designed interface endowed CF-2/PPESK composites with flexural strength of 1714 MPa and ILSS of 80.1 MPa─increases of 31.8 and 50.6%, with maintained high-temperature performance. This work provides a universal molecular strategy for tunable interfaces and a green-water-based solution for industrial applications.