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Sunday, 22 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Preparing UV-curable acrylate monomers with high refractive indices

Monday, 8 September 2014

Researchers synthesised UV-curable di-functional sulfur-containing thioacrylate and thiourethane acrylate with high refractive indices.

The acrylate monomes are UV curable Source: Pxelio/Manwalk

The acrylate monomes are UV curable Source: Pxelio/Manwalk

The structures of monomers were confirmed by nuclear magnetic resonance spectroscopy (NMR) and Fourier transform infrared spectroscopy (FT-IR). The formulation of UV-curable coating film was prepared by thioacrylate monomer, thiourethane acrylate monomer, α-hydroxy-α-methylpropiophenone as the photoinitiator, and bisphenol A epoxy acrylate as the oligomer. The cured coating films were investigated using thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), Taber abraser tests, transmittance, and refractive index.

Refractive index increased after UV-curing

The value of refractive index for all coating films increased after UV-curing. Transparent, photocurable coating films with high abrasion resistance were prepared. The monomers showed high refractive index. The refractive indices of synthesised monomers (thioacrylate and thiourethane acrylate monomer) are 1.623 and 1.577, respectively.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 11, November 2014, Pages 1695-1700.

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