1. The variation of the ordering in polyvinyl chloride and polymethylmethacrylate precipitated from solutions in the process of heat treatment was studied. 2. The intensity curves calculated from the electronographic (electron diffraction) data show that the heat treatment leads to the formation of a more ordered arrangement of the chain molecules of these amorphous polymers. 3. The variation of the degree of ordering in these polymers in the heat-treatment process causes a change of the mechanical properties of the polymers and of their capacity for reprocessing. 4. From the data obtained we may conclude that the form of the polymer molecules and their mutual arrangement in the solution differ from those in the condensed state.
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