| Abstract: | Conclusion For the first time, data are given on the quantitative composition of the transesterification products of dimethyl terephthalate with ethylene glycol at various molar ratios of the starting materials.During the transesterification process, oligomerization reactions take place rather intensively. Thereupon the linear oligomers are formed both in the transesterification process of carbomethoxy groups and also as a result of the interaction of carbohydroxyethoxy groups. The ethylene glycol formed in the latter case ensures further transesterification of the carbomethoxy groups.It is possible in principle to reduce the molar ratio of ethylene glycol to dimethyl terephthalate in the transesterification stage. Thereupon a polyethylene terephthalate can be obtained which has properties similar to the serially produced product.Translated from Khimicheskie Volokna, No. 5, pp. 18–20, September–October, 1983. |
