4.7 Article

Dynamic Polymer Binder with Light-Regulated Molecular Weight via Addition-Fragmentation Chain Transfer for Holographic Recording

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Manipulating the Relative Rates of Reaction and Diffusion in a Holographic Photopolymer Based on Thiol-Ene Chemistry

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Summary: This study investigates the effect of reaction and diffusion on the performance of thiol-ene-based holographic photopolymers. By controlling the rates of reaction and diffusion processes, the refractive index modulation and haze were evaluated. The results showed that changing the molecular weight of the polymer binder can vary the diffusion rate, while reducing the light intensity can decrease the reaction rate. Additionally, introducing a secondary thiol with slower reaction kinetics and a more stable thiyl radical can lower the refractive index modulation. An enhanced reactive binder with norbornene pendant groups was synthesized to achieve higher refractive index modulation at low light intensities.

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