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- W2091621103 abstract "On étudie les solutions mésomorphes d'un polymère semirigide l'hydroxypropylcellulose dans l'eau et celles obtenues en substituant une partie du solvant par un polymère flexible la polyvinylpyrrolidone. Les effets principaux sont: ⌜-un abaissement de la concentration d'apparition de la phase anisotrope; -une élévation de la température d'apparition du “gel”; ⌜-une diminution du pas du cholestérique. Des études pour différentes masses de PVP semblent indiquer qu'il n'y a pas démixtion mais modification de la phase mésomorphe dans le mélange. Mesomorphic solutions of a semi-rigid polymer, hydroxypropylcellulose in water, have been studied; the effects of the replacement of a part of the solvent by a flexible polymer, polyvinylpyrrolidone, have also been investigated. The principal effects are (i) lowering of the critical concentration of onset of the anisotropic phase, (ii) raising of the temperature of appearance of the “gel”, (iii) decrease of the pitch of the cholesteric structure. Investigations on different molecular weights of PVP seem to show a modification of the mesomorphic phase in the blend without demixing." @default.
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- W2091621103 date "1983-01-01" @default.
- W2091621103 modified "2023-09-25" @default.
- W2091621103 title "Addition d'un polymère “flexible” la polyvinylpyrrolidone à des solutions aqueuses mésomorphes d'un polymère semirigide l'hydroxypropylcellulose" @default.
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- W2091621103 doi "https://doi.org/10.1016/0014-3057(83)90083-6" @default.
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