Bioinspired Multi-Function Conversion Based on Recyclable Phase Change Polymers.

Biological systems achieve diverse functionalities using a limited set of building blocks through efficient assembly and disassembly processes. However, translating this efficiency into synthetic functional materials remains a challenge, particularly in balancing multifunctionality, recyclability, and performance adaptability. In this work, this is designed phase change polymers featuring dynamic covalent bonds in the main chain and crystalline side chains, enabling the conversion between multiple functionalities via highly efficient polymerization and depolymerization of building blocks. Specifically, a model compound consisting of a poly (lipoic acid) backbone is reported, onto which alkyl side chains are grafted via esterification reactions. The crystallinity of the side chains imparts reversible changes in modulus, adhesion, and optical properties with temperature modulation, allowing for applications such as electronic skin, anti-counterfeiting materials, and shape-memory materials. The dynamic covalent nature of the disulfide bonds within the polymer backbone enables efficient degradation back to monomers under mild acidic conditions, facilitating flexible conversion of materials for various applications. This research provides a new paradigm for the sustainable and economical synthesis of multifunctional materials and the realization of functional transformations between materials.