Regiochemical Control of Shape Morphing in Diels-Alder Covalent Adaptable Networks.

ABSTRACT: We demonstrate that regioisomerism in Diels-Alder (DA) reactions offers a subtle yet powerful way to tune the thermomechanical and shape morphing behavior of dynamic polymer networks. Here, we directly compare DA polymer (DAP) networks built from linear polymers with identical backbones but containing either 2- or 3-substituted furan pendant groups. For a wide range of cross-linking degrees, the 3-substituted DAP (3-DAP) networks exhibited higher thermal stability, with retro-DA dissociation temperatures (T_rDA) of ∼150 °C versus 120 °C for the 2-substituted counterparts, higher elastic moduli and significantly slower temperature-dependent stress relaxation rates. The difference in the stress relaxation rates of 2- and 3-DAP elastomers was leveraged to demonstrate c

SUBMITTER: Zhao Y 

PROVIDER: S-EPMC12548357 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature