中山大学章明秋团队报道了可逆互锁聚合物网络的拓扑约束。相关研究成果发表在2023年12月14日出版的《中国高分子科学杂志》。

最近，研究人员报道了一系列可逆互锁聚合物网络（RILNs），其机械鲁棒性和功能性的提高被认为是源于两个子网络的拓扑互锁，尽管仍缺乏直接的推导证据。

该文制备了一种专门设计的RILNs系统，其中组分间氢键可以根据需要屏蔽，并用于研究RILNs的微观结构，旨在验证RILNs中机械联锁的存在。通过改变溶胀溶剂的pH，消除了组分间非共价键的影响，从而暴露了网络结构的详细信息。小角度X射线散射（SAXS）和小角度中子散射（SANS）结果表明，即使在不存在组分间氢键的情况下，溶胀诱导的两个子网络的结构演化也相互影响，证明了拓扑互锁的存在。

这些发现可能有助于绘制更准确的物理图像，并揭示RILNs的详细结构-性质关系。

附：英文原文

Title: Topological Confinement in Reversibly Interlocked Polymer Networks

Author: Wan-Ting Dai, Zhen-Hua Xie, Yu-Bin Ke, Yang You, Min-Zhi Rong, Ming-Qiu Zhang

Issue&Volume: 2023-12-14

Abstract: Recently, we reported a series of reversibly interlocked polymer networks (RILNs), whose mechanical robustness and functionalities improvement was believed to be derived from topological interlocking of two sub-networks, although the direct evidence for the deduction is still lacking. Herein, a specially-designed RILNs system, in which the inter-component hydrogen bonds can be shielded as needed, was prepared and used to study the micro-structures of RILNs, aiming to verify the existence of mechanical interlocking in RILNs. By changing the pH of the swelling solvent, the effect exerted by the inter-component non-covalent bonds was eliminated, so detailed information of the networks structure was exposed. The small angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS) results indicated that swelling-induced structural evolution of the two sub-networks mutually affected each other, even when the inter-component hydrogen bonds were absent, proving the presence of topological interlocking. The findings may help to draw a more accurate physical image and reveal the detailed structure-property relationship of RILNs.

DOI: 10.1007/s10118-024-3070-3

Source: https://www.cjps.org/en/article/doi/10.1007/s10118-024-3070-3/