Abstract
A comparative study has been made of the properties of poly-(4,4′-oxydiphenylene)-pyromellitamide, measured directly on the polycondensate lacquer and after precipitation. Viscometry and light scattering measurements show that a drop in [η] at constant M w occurs with precipitation of a DMMA + THF mixture with polymer by toluene. The infrared spectra showed that precipitation gave an ordered polymer structure. It was proved by the NMR method, that the amide group content in the polymer was decreased by precipitation. The infrared spectral results show that in heat treatment of precipitated samples, the amide groups are broken up more than the imide rings. It is concluded that as a result of polymer precipitation, some ordering of the structure occurs, facilitating the formation of intra-chain imide bridges between units.
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