Journal
POLYMERS FOR ADVANCED TECHNOLOGIES
Volume 25, Issue 2, Pages 204-210Publisher
WILEY
DOI: 10.1002/pat.3224
Keywords
dopant; refractive index; glass transition; fibers; radical polymerization
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Funding
- Japan Society for the Promotion of Science (JSPS) through its Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)
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Graded-index plastic optical fibers, composed of doped polymers, have advantages over conventional glass optical fibers, but need to be developed further for practical application. Here, a variety of aromatic sulfide dopants were synthesized, and their effects on the refractive indexes and glass transition temperatures (T-g) of poly(methyl methacrylate) and methyl 2-chloroacrylate/2,2,2-trichloroethyl methacrylate copolymers were studied. While polymers containing large dopants exhibited relatively high refractive indices, their T-g values were low, making these materials unsuitable for graded-index plastic optical fiber applications. Six dopants yielded polymers that exhibited higher T-g values than the conventionally used (diphenyl sulfide)-doped polymer. The dopant dibenzothiophene, in particular, yielded polymers with the highest refractive indexes and T-g values, and polymers containing (phenylthio)benzene dopants also performed well. Copyright (c) 2013 John Wiley & Sons, Ltd.
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