Abstract
Relationships between birefringence change and structural change of the acrylic precursor fibers, made of acrylonitrile/methacrylic acid copolymer during stabilization reaction in air, were investigated to clarify the causes of birefringence change. The birefringence changed from slightly negative to highly positive by heat treatment at 200°C. The wide-angle X-ray pattern did not change essentially, showing apparently no fiber structure change. The IR spectra clarified the remarkable chemical structure change and resultant formation of the fully aromatic cyclised structure, which is considered the cause for increase of birefringence.
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Kakida, H., Tashiro, K. Mechanism and Kinetics of Stabilization Reaction of Polyacrylonitrile and Related Copolymers V. The Change in Birefringence of Acrylonitrile/Methacrylic Acid Copolymer Fibers by Heat Treatment under Fixed Length. Polym J 30, 474–478 (1998). https://doi.org/10.1295/polymj.30.474
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DOI: https://doi.org/10.1295/polymj.30.474