Poly(cyclohexylsilsesquioxane)-Based Hydrophilic Thermoset-Resistant Deep-Ultraviolet-Transparent Glasses with Low Melting Temperatures.

ACS Appl Mater Interfaces

Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.

Published: July 2023

Silsesquioxane (SQ)-based glasses with low melting temperatures were prepared by the cosolvent-free (solventless) hydrolytic polycondensation of organotrimethoxysilanes with cyclopentyl (-Pe) and cyclohexyl (-Hx) groups. Copolymers consisting of phenylsilsesquioxane (Ph-SQ) units and -Pe-SQ units [poly(Ph---Pe-SQ)] or -Hx-SQ units [poly(Ph---Hx-SQ)] were melted at 140 °C and formed clear glasses. The glasses prepared by this method contained many residual SiOH groups and exhibited high adhesive strength to microscope glass plates, metals, and several polymers. The glass-transition temperature of poly(-Hx-SQ) was lower than that of poly(Ph-SQ) by only a small margin, whereas that of poly(-Pe-SQ) was much lower. The poly(-Hx-SQ)-based glasses were stiff at room temperature and transparent in the deep-ultraviolet spectral region (≲300 nm). They formed fragile melts with kinetic fragility parameters as high as ∼0.8. The melts of poly(-Hx-SQ) and poly(-Hx--Et-SQ) exhibited better resistance to thermal curing than that of poly(Ph-SQ) and maintained thermoplasticity even after heat treatment at 200 °C for 6 h.

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http://dx.doi.org/10.1021/acsami.3c05758DOI Listing

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