RELATION BETWEEN STRUCTURE OF ETHENE -VINYLACETATE COPOLYMERS AND THEIR POUR POINT DEPRESSION

All kinds of molecule structures of the ethylene - vinyl acetate copolymers (EVA) have been synthesized by solution polymerization. Their crystallinity, solubility and the effect of lowering pour point of crude have been studied. Results show that only carbon atoms far from polar group of EVA take part in crystallizing. When carbon number of alkyl chain of EVA, which takes part in crystallizing, is about equal to three fourths of average carbon number of wax, the effect of EVA pour point depressants is best. When the average relative molecular mass of EVA is 1.2×104, the effect of EVA is best. The distribution of relative molecular mass has little influence.