Abstract
Polybutadiene-aramid multi-block copolymers having structural regularity were synthesized by a one-pot two-step method of direct polycondensation using triphenyl phosphite and pyridine as condensing agents. Amine-terminated telechelic aramid oligomers were prepared by the reaction of 3,4′-oxydianiline and isophthalic acid, and condensed with α,ω-polybutadienedicar-boxylic acid giving the multi-block copolymers with inherent viscosities of 0.2—0.4 dlg−1. They were soluble in a wide range of solvents including N,N-dimethylacetamide, pyridine, and tetrahydrofuran, and gave transparent, ductile, and elastomeric films by casting from the solutions of these solvents. Depression of the glass transition temperatures of polybutadiene phase in the multi-block copolymers was observed by increasing the aramid content. The tensile strength and modulus decreased with decreasing aramid content, whereas elongation at break increased.
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References
S. Ogata, M. Kakimoto, and Y. Imai, Macromolecules, 18, 851 (1985).
Y. Imai, M. Kajiyama, S. Ogata, and M. Kakimoto, J. Polym. Sci., Polym. Chem. Ed., 22, 3183 (1984).
T. Inoue, S. Ogata, M. Kakimoto, and Y. Imai, Macromolecules, 17, 1417 (1984).
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Ogata, Si., Maeda, H., Kakimoto, Ma. et al. Synthesis and Properties of Multi-Block Copolymers Based on Polybutadiene and Aromatic Polyamides Having Unsymmetrical Structures. Polym J 17, 935–941 (1985). https://doi.org/10.1295/polymj.17.935
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DOI: https://doi.org/10.1295/polymj.17.935