Modular Control of Glass Transition and Transparency in ROMP-Derived Oxanorbornene Polymers

초록

Achieving both high optical transparency and high glass-transition temperature (T-g) remains challenging in cyclic olefin polymers. Here, ring-opening metathesis polymerization (ROMP)-derived oxanorbornene polymers enable modular tuning of these competing properties through imide N-substitution and comonomer architecture. P-OCy exhibited a T-g of 224.5 degrees C with 94.9% transmittance at 400 nm. Flexible ester comonomers improved transparency but reduced T-g to 121.1-146.4 degrees C, whereas rigid MMETCD preserved T-g near 210 degrees C while increasing P-OPh transmittance from 61.0% to 90.0%. These systematic comparisons reveal distinct structural contributions to thermal rigidity and optical clarity, establishing practical design guidelines for transparent, high-T-g oxanorbornene polymers.

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