Transparent zero-birefringence copolymer and its optical properties

Shuichi Iwata, Hisashi Tsukahara, Eisuke Nihei, Yasuhiro Koike

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)


Birefringence is caused by both orientation of polymer chains and photoelasticity. These birefringences were compensated by random copolymerization of negative birefringent methyl methacrylate and positive birefringent benzyl methacrylate, but orientational and photoelastic zero birefringences were achieved with quite different compositions of the copolymers. Note that the birefringence of the copolymer that occurred in the process of injection molding was almost completely eliminated with a composition for orientational zero birefringence. The orientational and photoelastic zero-birefringence copolymers possessed enough transparency as optical materials that the total scattering losses were 30.4 and 19.5 dB/km, respectively, competing with the transparency of homopolymers.

Original languageEnglish
Pages (from-to)4549-4555
Number of pages7
JournalApplied Optics
Issue number19
Publication statusPublished - 1997 Jul 1


  • Injection molding
  • Light scattering
  • Orientational birefringence
  • Photoelastic birefringence
  • Zero-birefringence copolymer

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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