Dynamic covalent networks enable thermadapt two-way shape memory behavior in syndiotactic 1,2-polybutadiene-based recyclable polymers
Two-way shape memory polymers (2W-SMPs), which can transition between two distinct temporary shapes, have garnered significant attention from researchers. This study successfully developed thermadapt 2W-SMPs using syndiotactic 1,2-polybutadiene (SPB) by leveraging dynamic covalent crosslinking techniques. Initially, m-chloroperbenzoic acid (m-CPBA) was employed for the epoxidation of SPB. Cysteine (Cys) was subsequently introduced to form a dynamic covalent bond of β -hydroxy ester via the reaction between the epoxy groups on SPB and the carboxyl groups of Cys. The sulfhydryl groups of Cys can undergo oxidative coupling to form disulfide bonds, thereby establishing two distinct types of dynamic covalent bonds within the material and lowering its topological rearrangement temperature. Through the exchange reactions of these dynamic covalent bonds at elevated temperatures, the resulting material exhibits enhanced mechanical properties and can be reshaped in the solid state. This work provides a viable method for preparing recyclable thermally adaptive 2W-SMPs under stress-free conditions, thereby enriching the research landscape in the field of shape memory materials.
危险品化学品经营许可证（带存储）