UV-Curable Poly (Urethane Acrylate)/Silica Hybrid Materials for Hard Coating Application
Date Issued
2012
Date
2012
Author(s)
Wang, Shao-Cheng
Abstract
In this study, a series of urethane acrylate/silica hbrid hard coating were developed. This coating was designed to be with performance of high pencil hardness, high adhesion and high transmittance. We could find the influences of the molar ratio of Tetraethoxysilane (TEOS) to 3-(trimethoxysilyl) propylmethacrylate (MSMA) and the weight ration of resin to silica on pencilhardness, adhesion, thermal property and transmittance.
The silica particle were synthesized by sol-gel process. The size of silica particle was 14nm. The silica spheres weresuccessfully modified by MSMA, and the acrylate functional groups were chemically bonded tothe surface of silica spheres, in order to enhance the compatibility oforganic and inorganic interface. FT-IR and DLS were employed tocharacterize the modification of the silica spheres.
A series of urethane acrylate resins were synthesized. The UV-curable poly (urethane acrylate)/silica hybrid hard coatings were composed of urethane acrylates , modified silica particles and I 184. By adding silica particle, some formulae of coating could reach 7H pencil hardness on PET substrate. The urethane linkage of urethane acrylates could improve the poor adhesion, which resulted from adding too much silica. By SEM, we could find the influence of the amound of MSMA on the dispersity of silica in resins. At hight loading of silica, it needed enough MSMA to make silica disperse well in hybrid materials.
Subjects
UV-curable
Urethane acrylate
Sol-gel process
Hybrid
Hard coating
Type
thesis
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