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High Refractive Index of Transparent Acrylate Polymers Functionalized with Alkyl Sulfur Groups
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- Authors
- Muchchintala Maheswara, Sang-Hyun Oh, Jung-Jin Ju, Seung Koo Park, Suntak Park, Jung Yun Do
- Issue Date
- 2010-03
- Citation
- Polymer Journal, v.42, no.3, pp.249-255
- ISSN
- 0032-3896
- Publisher
- Society of Polymer Science
- Language
- English
- Type
- Journal Article
- Abstract
- Several sulfur-containing acrylate polymers were developed for a high refractive index with high transparency and good processing performance for thin films. A series of poly(methacrylate)s were synthesized by radical polymerization, in which thin films are coated on a quartz substrate for optical characterization. One, two and three sulfur atoms were bound into acrylate monomers and thermally copolymerized with methyl methacrylate. An alicyclic structure was used to achieve a dense molecular volume of the sulfur-containing monomer. Refractive index was measured under visible light. The index linearly increased with the sulfur-containing monomer content of the copolymer. Each homopolymer was predicted by an extrapolation method, resulting in a high refractive index of 1.624-1.725 at 589 nm. An Abbe's number of 30 was recorded for most sulfur polymers, indicating low wavelength dispersion of the index. A polymer with dipolar functionality displayed an Abbe's number of 40.9. High optical transparency of films was observed at the wavelengths of the index measurement. All polymers were thermally stable up to 250 °C and exhibited glass transition around 100 °C. © The Society of Polymer Science, Japan (SPSJ) All rights reserved.
- KSP Keywords
- Acrylate monomer, Glass transition, High optical transparency, High refractive index, High transparency, Index measurement, Molecular volume, Optical characterization, Polymer science, Radical polymerization, Sulfur Groups