FORMATION OF LIQUID-CRYSTALLINE STRUCTURE IN THE PROCESS OF FILM EXTRUSION FROM CELLULOSE DIACETATE

Liquid-crystalline (LC) polymer properties depend considerably on the chemical structure of the rigid and flexible parts of the macromolecul ar chains. The relation of these factors determines a complex of physi cal and chemical properties and thus the operating characteristics. Re alization of the LC state within a temperature range which is required by processing and operating conditions is achieved by the synthesis o f LC's of a certain structure. The formation of LC structures in cellu lose diacetate by selection of plasticizer level and type is considere d in this article. Plasticizer selection is determined by the ratio of the polymer specific cohesion energies and the specific cohesion ener gies of a combined plasticizer consisting of a true plasticizer with t he addition of small amounts of a precipitator.