102. (Macro. Rapid Commun.) Dual-Dynamic Chemistries-Based Fast-Reprocessing and High-Performance Covalent Adaptable Networks
writer：Kezhen Hu, Binbo Wang, Xiwei Xu, Yi Su, Weiqiong Zhang, Sican Zhou, Chuanzhi Zhang, Jin Zhu, Songqi Ma*
keywords：acetal，covalent adaptable networks，dual-dynamic bonds, fast reprocessing，high performance
source：期刊
specific source：Macromolecular Rapid Commnucations
Issue time：2023年
Covalent adaptable networks (CANs) possess multiple functions including reprocessing (or recyclability), self-healing, welding, shape shifting, three dimensional（3D) printing, etc., due to the network rearrangement from dynamic bonds, and favorable performance from their cross-linked feature, and they are supposed to be as sustainable alternatives to thermosets. However, the thermal and mechanical properties, and stability of CANs are often sacrificed for rapid network rearrangement. In this paper, fast-reprocessing CANs with high performance are facilely constructed by in situ polymerization and dynamic cross-linking of styrene (St), maleic anhydride (MA), and acetal diol (BHAD). The rigid and hydrophobic polymer backbone endow the materials with high glass transition temperatures, mechanical performance, and water resistance. Besides, carboxylic group-catalyzed dual dynamic ester and acetal-based networks exhibit faster stress relaxation and realize extrusion reprocessing. This work provides an ingenious and simple strategy of construction of CANs combining rapid network rearrangement and excellent comprehensive performance, which is beneficial for the application of CANs.
論文鏈接：https://doi.org/10.1002/marc.202200726