Abstract
We report a study of fiber formation from solutions of poly(p-benzamide) (PBA) in N,N-dimethylacetamide (DMAc) containing 3% LiCl. Polymers were prepared by the Yamazaki reaction and had intrinsic viscosity between 1.37 and 1.85 dl g−1. We analyze in detail the role of polymer concentration (Cp), extrusion and take-up speed, and processing temperature. Fiber properties are modest when Cp is considerably below the critical concentration Cp′ at which the mesophase first appears. However, they improve in the pretransitional zone and exhibit a definite jump at Cp≅Cp′, but tend to worsen again at Cp>Cp′. The velocity of the freely extruded filament, Vf, is smaller than the extrusion velocity V0 revealing relaxation effects. There is however an optimal temperature at which Vf/V0=1. The occurrence of these relaxation effects, and of crystallization at Cp only slightly greater than Cp′, prevents the development of elastic moduli in excess of 50 GPa or strength above 1 GPa. Conditions for fully exploiting the orientability of the mesophase are discussed.
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Conio, G., Bruzzone, R., Ciferri, A. et al. Fiber Formation from Liquid Crystalline Precursors I. Poly(p-benzamide). Polym J 19, 757–768 (1987). https://doi.org/10.1295/polymj.19.757
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DOI: https://doi.org/10.1295/polymj.19.757