Preparation Of Methylallyl High Refractive Index Monomers Containing Thioester And Coatings

Compared with inorganic optical materials, polymer optical materials have several aspects of advantages, such as lightweight, easy molding processing. Wherein, polymer optical material with high refractive index has a broad application prospect. The key to prepare high refractive index polymer optical material is the research and development of high refractive index monomer.In this thesis,2-methylallyl benzothiazole thioester (MABTTE) and 2-methylallylthiophene thioester (MATTE) have been synthesized through reactions between twokinds of single-mercapto monomers and methacryloyl chloride. The yield and refractive index of MABTTE are respectively 65.3% and 1.611. The yield of MATTE is 69.3%. MATTE exhibits the highest refractive index of 1.642 among target monomers.4,4’-bis(methylallyl thioester)-diphenyl sulfide (BMATEBPS) has been synthesized through bis-mercapto monomer reacting with methacryloyl chloride. The yield of BMATEBPS shows the highest yield among targe monomers which reaches 74.7%.The refractive index of BMATEBPS is 1.626.2,5-bis(methylallyl thioester)-thiadiazole (BMATETDZ) has been synthesized from a raw material of Nitrogen-containing monomer with bis-mercapto. The yield and refractive index of BMATETDZ are respectively 62.3% and 1.635. BMATETDZ is lightest in color among target monomers.Four coatings, obtained from synthetic high refractive index monomers, have been prepared by UV-curing. They are poly-2-methylallyl benzothiazole thioester (C-PMABTTE), poly-2-methylallyl thiophene thioester (C-PMATTE), poly-4, 4’-bis(methylallyl thioester)-diphenyl sulfide (C-PBMATEBPS) and poly-2, 5-bis(methylallyl thioester)-thiadiazole (C-PBMATETDZ). Their refractive index, transmittance, stability has been determined. C-PBMATETDZ exhibits a high refractive index of 1.654, a good transmittance of the visible above 80% and a satisfied initial thermal decomposition temperature at 389.4 ℃. The hardness and adhesion level of C-PBMATETDZ are respectively 4H and level-1 when copolymerizing with 40 wt% styrene.