Multistage Reversible <i>T</i><sub>g</sub> Photomodulation and Hardening of Hydrazone-Containing Polymers
Sirun Yang, Jared D. Harris, Aloshious Lambai, Laura L. Jeliazkov, Gaurav Mohanty, Hao Zeng, Arri Priimägi, Ivan Aprahamian
Abstract
The glass transition temperature (Tg) of a series of polyacrylate- and polymethacrylate-based polymers having bistable hydrazone photoswitches as pendants increases upon photoisomerization. The ensuing photohardening of the polymeric network was corroborated using nanoindentation measurements. The bistability of the switch allowed us to lock-in and sustain multiple Tg values in the same polymeric material as a function of the hydrazone switch’s Z/E isomer ratio, even at elevated temperatures.
Topics & Concepts
HydrazoneChemistryBistabilityPolymerGlass transitionPolymer chemistryPhotoisomerizationChemical engineeringPhotochemistryOrganic chemistryOptoelectronicsMaterials scienceIsomerizationCatalysisEngineeringPhotochromic and Fluorescence ChemistryLiquid Crystal Research AdvancementsLuminescence and Fluorescent Materials