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3 October 2022 Model for athermal enhancement of molecular mobility in solid polymers by light (Conference Presentation)
Zouheir Sekkat
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Proceedings Volume PC12212, Molecular and Nano Machines V; PC1221209 (2022) https://doi.org/10.1117/12.2636119
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States
Abstract
Molecular motion in polymers is frozen below the glass transition temperature T-g and changes of viscoelastic functions are most spectacular near T-g. Exceptional enhancement of molecular mobility and a decrease of polymer viscosity, by several orders of magnitude, down to the viscous flow regime, are observed way below T-g by light absorption. Relaxation processes, which take decades to centuries in some high-T-g polymers, are reduced to minute timescales by sub-T-g light absorption. Here we develop a model for this intriguing albeit spectacular action of light on glass forming materials and we propose experiments to relate light absorption to materials properties. The model provides a solution to a long-lasting problem of how molecular mobility is enhanced in solid polymers by photoisomerization and provides a tool for a better understanding of the relationship between light absorption and material properties and developing photosensitive polymers for light to mechanical energy transduction.
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Zouheir Sekkat "Model for athermal enhancement of molecular mobility in solid polymers by light (Conference Presentation)", Proc. SPIE PC12212, Molecular and Nano Machines V, PC1221209 (3 October 2022); https://doi.org/10.1117/12.2636119
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KEYWORDS
Polymers
Solids
Absorption
Motion models
Glasses
Temperature metrology
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