Effect of dopant structure on refractive index and glass transition temperature of polymeric fiber-optic materials

Kotaro Koike, Hongxiang Teng, Yasuhiro Koike, Yoshiyuki Okamoto

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19 Citations (Scopus)


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 (Tg) 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 Tg values were low, making these materials unsuitable for graded-index plastic optical fiber applications. Six dopants yielded polymers that exhibited higher Tg values than the conventionally used (diphenyl sulfide)-doped polymer. The dopant dibenzothiophene, in particular, yielded polymers with the highest refractive indexes and Tg values, and polymers containing (phenylthio)benzene dopants also performed well.

Original languageEnglish
Pages (from-to)204-210
Number of pages7
JournalPolymers for Advanced Technologies
Issue number2
Publication statusPublished - 2014 Feb 1



  • Dopant
  • Fibers
  • Glass transition
  • Radical polymerization
  • Refractive index

ASJC Scopus subject areas

  • Polymers and Plastics

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