Open Access Article
This Open Access Article is licensed under a Creative Commons Attribution-Non Commercial 3.0 Unported LicenceLight-Driven Rheological Modulation of Solventless Polymer Networks Enabled by Precisely Architected Flexible Star Polysiloxanes
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Satoshi Honda , Yi Zhang and Masaru Tanaka
First published on 27th October 2025
Abstract
We report the synthesis and photoresponsivity of precisely designed liquid star-shaped poly(dimethyl siloxane) (PDMS) with anthracene end groups. Owing to the efficient end-linking of the flexible PDMS arms upon the first UV irradiation (λ = 365 nm, UV365), the storage modulus (G’) increased from 4.7 Pa to 119 kPa (>25,000-fold), and the physical state became a rubbery solid. Subsequent irradiation with UV light at a shorter wavelength (λ = 254 nm, UV254) decreased G’ toward the photostationary state, and viscoelasticity modulation was achieved between the two photostationary states under solvent-free conditions.