近日，武汉大学李振团队研究了具有大非线性光学效应和高热稳定性的光交联二阶非线性光学聚合物薄膜。相关论文于2026年3月3日发表在《中国高分子科学杂志》上。

有机二阶非线性光学材料商业化的最大挑战之一，在于其非线性与稳定性之间固有的权衡关系。缓解这一矛盾的关键在于实现交联网络形成与发色团最优非中心对称排列建立之间的精确时间同步。

基于这一原理，研究组开发了一系列含有多个低旋转能垒醚链的非线性光学聚合物，这种结构有利于在电场极化过程中分子发生重新取向，从而有效增强非线性光学响应。结合优化的光交联策略，所制备的PX4o/PETMP掺杂薄膜实现了高达190 pm·V^-1的宏观非线性光学系数以及120°C的热降解温度。这项工作为在多种聚合物体系中缓解"非线性-稳定性"权衡问题提供了一种普适方法。

附：英文原文

Title: Photo-crosslinked Second-order Nonlinear Optical Polymer Films with Large Nonlinear Optical Effect and High Thermostability

Author: Pan-Pan Qiao, Qian-Qian Li, Zhen Li

Issue&Volume: 2026-03-03

Abstract: One of the most significant challenges in commercializing organic second-order nonlinear optical (NLO) materials lies in the inherent trade-off between nonlinearity and stability. A key factor in mitigating this compromise is achieving precise temporal synchronization between the formation of the cross-linked network and the establishment of an optimal non-centrosymmetric alignment of the chromophores. Guided by this principle, we developed a series of NLO polymers incorporating multiple ether chains with low rotational energy barriers, which facilitate molecular reorientation during electric field poling, thereby enhancing the NLO response effectively. Combined with an optimized photo-crosslinking strategy, the resulting PX4o/PETMP doped film achieved large macroscopic NLO coefficient of 190 pm·V1 and thermal degradation temperature as high as 120 °C. This work offers a universal approach to alleviating the “nonlinearity-stability” trade-off in a wide range of polymeric systems.

DOI: 10.1007/s10118-026-3579-8

Source: https://www.cjps.org/en/article/doi/10.1007/s10118-026-3579-8/