美国凯斯西储大学Lei Zhu团队揭示了无氟强偶极聚合物表现出可调谐的铁电性。2025年7月3日，该研究成果发表在《科学》杂志。

目前对铁电聚合物的研究主要集中在聚偏氟乙烯（PVDF）基含氟聚合物上，因为它们具有优异的性能。然而，由于环境问题，它们被认为是“永远的化学物质”。

研究组描述了一个合理设计的无氟铁电聚合物家族，具有聚氧丙烯主链和二磺酰烷基侧链和C3间隔：SO₂CH₂CHRCH₂SO₂（R = H或CH₃）实验和模拟结果均表明，相邻二磺酰基之间的强偶极-偶极相互作用在凝聚态下诱导铁电有序，这可以通过改变R基团来调整：R = H时的铁电或R = CH₃时的弛豫铁电。在低电场下，弛豫聚合物表现出与最先进的PVDF基四聚物相当的电致动和电热性能。

附：英文原文

Title: Fluorine-free strongly dipolar polymers exhibit tunable ferroelectricity

Author: Jiahao Huang, Guanchun Rui, Yueming Yan, Elshad Allahyarov, Man-Hin Kwok, Wenyi Zhu, Li Li, Shixian Zhang, Zhiliang Pan, Deyu Li, Honghu Zhang, Richard R. Mu, Bin Zhao, Qing Wang, Philip L. Taylor, Richard F. Haglund, Q. M. Zhang, Lei Zhu

Issue&Volume: 2025-07-03

Abstract: Current research on ferroelectric polymers centers predominantly on poly(vinylidene fluoride) (PVDF)–based fluoropolymers because of their superior performance. However, they are considered “forever chemicals” with environmental concerns. We describe a family of rationally designed fluorine-free ferroelectric polymers, featuring a polyoxypropylene main chain and disulfonyl alkyl side chains with a C3 spacer: SO2CH2CHRCH2SO2 (R = H or CH3). Both experimental and simulation results demonstrate that strong dipole-dipole interactions between neighboring disulfonyl groups induce ferroelectric ordering in the condensed state, which can be tailored by changing the R group: ferroelectric for R = H or relaxor ferroelectric for R = CH3. At low electric fields, the relaxor polymer exhibits electroactuation and electrocaloric performance comparable with those of state-of-the-art PVDF-based tetrapolymers.

DOI: ads4702

Source: https://www.science.org/doi/10.1126/science.ads4702