All polymers were thermally stable up to ∼250 ☌ and exhibited glass transition around 100 ☌. High optical transparency of films was observed at the wavelengths of the index measurement. A polymer with dipolar functionality displayed an Abbe's number of 40.9. An Abbe's number of ∼30 was recorded for most sulfur polymers, indicating low wavelength dispersion of the index. Each homopolymer was predicted by an extrapolation method, resulting in a high refractive index of 1.624–1.725 at 589 nm. The index linearly increased with the sulfur-containing monomer content of the copolymer. Refractive index was measured under visible light. An alicyclic structure was used to achieve a dense molecular volume of the sulfur-containing monomer. One, two and three sulfur atoms were bound into acrylate monomers and thermally copolymerized with methyl methacrylate. A series of poly(methacrylate)s were synthesized by radical polymerization, in which thin films are coated on a quartz substrate for optical characterization. Several sulfur-containing acrylate polymers were developed for a high refractive index with high transparency and good processing performance for thin films.
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