近日，武汉科技大学陈红祥团队报道了苹果酸调晶与氢键协同作用对聚己内酯基聚氨酯双向形状记忆的影响。相关论文于2026年6月11日发表在《中国高分子科学杂志》上。

半结晶聚合物可通过共聚或共混获得较宽的熔融转变区间，并在无应力条件下表现出双向形状记忆效应（2W-SME）。然而，聚合物之间的复杂相互作用难以精确调控。对于半结晶聚合物而言，通过拓宽熔融转变区间来实现双向形状记忆效应仍然具有挑战性。

研究组以苹果酸作为侧链，制备了基于聚己内酯（PCL）的交联聚氨酯，从而探究苹果酸与PCL结晶度或2W-SME性能之间的关系。结果表明，苹果酸的引入拓宽了熔融转变区间，并改善了PCL基交联聚氨酯的双向形状记忆行为。利用原位偏振光显微镜（POM）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）研究了苹果酸对聚氨酯动态响应机制的影响。研究发现，苹果酸侧链在双向形状记忆过程中发挥着双重作用：调节结晶行为和增强氢键网络。这项工作为双向形状记忆聚合物的结构设计提供了一种通用策略。

附：英文原文

Title: Two-way Shape Memory Effect of Polycaprolactone-based Polyurethane via Synergistic Role of Hydrogen Bonding and Crystallization Tuned by Malic Acid

Author: anonymous

Issue&Volume: 2026-06-11

Abstract: Semi-crystalline polymers can obtain a broad melting transition by copolymerization or blending and show a two-way shape memory effect (2W-SME) under stress-free conditions. However, intricate interactions between polymers are not easily controlled. It is still challenging for semi-crystalline polymers to obtain a two-way shape memory effect by broadening the melting transition. Here, we prepared polycaprolactone (PCL)-based cross-linked polyurethane by using malic acid as a side chain, thereby exploring the relationship between malic acid and the crystallinity of PCL or 2W-SME. The results showed that the incorporation of malic acid broadened the melting transition and improved the two-way shape memory behavior of the PCL-based cross-linked polyurethane. The influence of malic acid on the dynamic response mechanism of polyurethane was studied using in situ polarized optical microscopy (POM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. The investigation revealed that the malic acid side chain plays a dual role by adjusting the crystallization behavior and strengthening the hydrogen-bonding network in the two-way shape memory process. This work provides a versatile strategy for the structural design of two-way shape memory polymers.

DOI: 10.1007/s10118-026-3686-6    

Source: https://www.cjps.org/thesisDetails#10.1007/s10118-026-3686-6&lang=en