Abstract
Fibers drawn form poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (PBI) were studied by DSC and DMA. PBI is a high temperature polymer T g is between 387 and450°C depending on the measurement technique used. The as-spun fiber is free of orientation. The oriented fiber exhibits considerable dependence on whether the DSC measurements were carried out in free-to-shrink or fixed-length modes. The β-relaxation is at 290°C, and was associated with loss of water. The γ-transition at 20°C was not identified, while theδ-transition at –90°C seems to correspond to rotation of the m-phenylene ring.
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References
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Menczel, J.D. Thermal Measurements on Poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] Fibers. Journal of Thermal Analysis and Calorimetry 59, 1023–1027 (2000). https://doi.org/10.1023/A:1010155215759
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DOI: https://doi.org/10.1023/A:1010155215759