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• W2065894859 abstract "Direct condensation polymerization of N-alkylated p-aminobenzoic acid, in which methyl, propyl, butyl, pentyl, heptyl, octyl and heptadecyl substituents were used as the alkyl group, was performed using hexachloroethane, triphenylphosphine and pyridine as condensation reagents. Pale-yellow N-alkylated poly(p-benzamide) (PABAn) polymers, where n is the number of carbon atoms of the alkyl side chain, were obtained in 46–87% yields with an inherent viscosity of 0.06–0.65 per 100 ml g−1 (conc. H2SO4, 30 °C). The structures of PABAn were identified using infrared, nuclear magnetic resonance and elemental analysis. PABAn with long alkyl side chains (n>3) showed good solubility in chloroform, as well as conc. H2SO4 and m-cresol. The glass transition temperature (Tg) of PABAn measured by differential scanning calorimetry gradually decreased with an increase in the length of the alkyl group. The endothermic peak corresponding to melting was observed for PABAn with n=3, 4, 5 and 17 on DSC profiles. The wide-angle powder X-ray scattering of the polymer samples indicated that PABAn polymers with n=0, 1, 3, 4, 5 and 17 were crystalline polymers. X-ray scattering profiles showed PABAn with n=3, 4 and 5 crystallized in an orthorhombic lattice, whereas PABA1 crystallized in a monoclinic lattice. PABA17 crystallized in hexagonal packing at the long side chain with an interplanar spacing of 4.2 Å. Direct condensation polymerization of N-alkylated aminobenzoic acid was carried out using hexachloroethane, triphenylphosphine and pyridine as condensation reagents. Pale-yellow, fibrous polymers (PABAn, where n is the number of carbon atoms of the side chain) were obtained in 46–87% yields with an inherent viscosity of 0.30–1.18 per 100ml g−1 (sulfuric acid, 30 °C). DSC analysis and powder X-ray scattering of polymer samples indicated that PABAn with Me, Pr, Bu, Pe and Ste as side chains were crystalline polymers. X-ray scattering profiles indicated that PABAn with n=0, 3, 4 and 5 crystallized in an orthorhombic lattice, whereas PABA1 crystallized in a monoclinic lattice. PABA17 crystallized with hexagonal packing at the long side chain with an interplanar spacing of 4.2Å." @default.
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• W2065894859 date "2010-01-01" @default.
• W2065894859 modified "2023-10-14" @default.
• W2065894859 title "Direct condensation polymerization of N-alkylated p-aminobenzoic acid and packing of rigid-rod main chains with flexible side chains" @default.
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• W2065894859 doi "https://doi.org/10.1038/pj.2009.306" @default.
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