Synthesis of aramides in solutions of poly(vinylpyrrolidone) |
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Authors: | Andree Henze Werner Berger Claudia Kummerlwe Hans-Werner Kammer |
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Institution: | Andree Henze,Werner Berger,Claudia Kummerlöwe,Hans-Werner Kammer |
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Abstract: | Results on polycondensation of poly(1.4 benzamide) (PBA) and 2.5.DCIPDAcoTPA in solutions of poly(vinylpyrrolidone) (PVP) will be presented. For polycondensation, the method of OGATA, using triphenylphosphine and hexachloroethane, and the low-temperature solution polycondensation of dicarboxylic acid dichlorides and diamines, were applied. It is shown that the molar mass of PBA depends strongly on the PVP:PBA ratio. To explain this dependence, one has to take into account the phase behavior of the ternary rigid rod polymer/flexible coil polymer/solvent system and the influence of the matrix polymer. An enhancement of the molar mass of the PBA produced can be observed when the PVP:PBA is high enough to prevent an association of the PBA, i.e. when one stays in the isotropic one-phase area of the phase diagram. Under these circumstances, it is possible to obtain one-phase systems in nonsolvents for the aramides. |
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Keywords: | Polycondensation Poly(1 4 benzamide) Molecular composite Phase diagram |
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