Polymer architecture dictates multiple relaxation processes in soft networks with two orthogonal dynamic bonds.

ABSTRACT: Materials with tunable modulus, viscosity, and complex viscoelastic spectra are crucial in applications such as self-healing, additive manufacturing, and energy damping. It is still challenging to predictively design polymer networks with hierarchical relaxation processes, as many competing factors affect dynamics. Here, networks with both pendant and telechelic architecture are synthesized with mixed orthogonal dynamic bonds to understand how the network connectivity and bond exchange mechanisms govern the overall relaxation spectrum. A hydrogen-bonding group and a vitrimeric dynamic crosslinker are combined into the same network, and multimodal relaxation is observed in both pendant and telechelic networks. This is in stark contrast to similar networks where two dynamic bonds share the s

SUBMITTER: Ge S 

PROVIDER: S-EPMC10636115 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature