Zero-birefringence polymer doped with a nano size birefringent crystal

H. Ohkita, A. Tagaya, Y. Koike

Research output: Contribution to journalArticlepeer-review


We reported the "birefringent crystal dopant method" in order to compensate the orientational birefringence of polymers. In this method, a birefringent inorganic crystal is homogeneously doped in a polymer and compensates the birefringence of the polymer. Strontium carbonate (SrCO 3) was selected for this purpose because it has a large birefringence and a rod-like shape. SrCO3 was synthesized and doped into a poly(MMA/BzMA=78/22(wt/wt)) (78/22 polymer) film and the film was drawn above glass transition temperature (Tg). The orientational birefringence of the drawn film at a wavelength of 633 nm was compensated by doping with 0.3 wt% of SrCO3 without losing its transparency and thermostability.

Original languageEnglish
Pages (from-to)73-77
Number of pages5
JournalVDI Berichte
Issue number1920
Publication statusPublished - 2005 Dec 19

ASJC Scopus subject areas

  • General Engineering


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