Decoupling of Interfacial Ionic Diffusion from Segmental Dynamics in Silica-Filled Silicone Gel through Experiments.

ABSTRACT: This study experimentally investigates and models the ionic diffusion coefficient at inert particle/polymer interfaces in silica-filled silicone gels, aiming to elucidate the relationship between ion diffusion and segmental dynamics at interfaces. As the specific surface area of silica increases, more loop-type structure chains form at the silica-silicone gel interface. Enhanced silicone chain flexibility at the interface, coupled with a low dielectric constant, strengthens electrostatic interactions and elastic forces, increasing ion jump energy barriers and reducing ion diffusion. Consequently, the influence of polymer segmental dynamics on ion diffusion becomes more significant, shifting the decoupling index between segmental dynamics and the ionic diffusion coefficient from negative to

SUBMITTER: Lin Y 

PROVIDER: S-EPMC12269070 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature