Abstract
The mesophase behavior of block copolymers composed of rigid poly(p-benzamide) (PBA) and the flexible polyterephthalamide of p-aminobenzhydrazide (PABH-T) (80:20, w/w) was investigated using N,N-dimethylacetamide (DMAc)+3% LiCl as a solvent. These copolymers include a fraction soluble in dimethyl sulfoxide (DMSO) which was attributed to oligomers and polymers rich in PABH-T. The variation of the volume fraction of the isotropic phase with overall composition within the biphasic gap is more complex than previously observed. As a result, a single anisotropic phase cannot be observed. The flexible component soluble in DMSO is partitioned between the conjugated phases, apparently violating the incompatibility between rigid and flexible polymers in the mesophase. The solubility of these systems is larger than that of the rigid homopolymer. Characterization of the component soluble in DMSO, of the residue, and of the reassembled sample was also performed. The latter shows an incomplete recovery of the properties of the original sample, suggesting labile adducts between rigid and flexible components in the mesophase. Results are discussed in terms of current theories for the liquid crystalline behavior of copolymers.
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Bianchi, E., Ciferri, A., Conio, G. et al. Nematogenic Block Copolymers of Rigid and Flexible Aromatic Units III. Additional Phase Equilibria Studies. Polym J 20, 83–91 (1988). https://doi.org/10.1295/polymj.20.83
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DOI: https://doi.org/10.1295/polymj.20.83