Preparation of Hard Coating Solutions with High Refractive Index for Polycarbonate Sheet by the Sol-Gel Method

摘要

In order to overcome the problem of poor hardness of transparent polycarbonate(PC)sheets,organic-inorganic hybrid hard coating solutions,which show a high refractive index above 1.58,were made by the sol-gel method.These hybrid coating solutions were obtained from mixture of titanium tetraisopropoxide(TTIP),and(3-glycidoxypro-pyl)trimethoxysilane(GPTMS).The PC sheets were spin-coated,and cured at 120°C for 2 hr.Change of refractive index in the range of 1.53-1.61 was obtained by varying the GPTMS content.The refractive index of the coated film decreased with increasing the GPTMS content,while the pencil hardness of the coated film was found to increase with increasing the GPTMS content.