| Autor: |
Korshak, V. V., Bekasova, N. I., Zamiatina, V. A. |
| Zdroj: |
Russian Chemical Bulletin; April 1958, Vol. 7 Issue: 4 p463-468, 6p |
| Abstrakt: |
1.A study was made of the polyesterification of bis-2-hydroxyethyl terphthalate at atmospheric pressure in the temperature range 240–285°, and the rate constants of the reaction were determined.2.The activation energy was calculated and found to be 35,000 cal/mole.3.It was shown that the polyesterification of bis-2-hydroxyethyl terephthalate in absence of catalyst proceeds in accordance with the laws of a second-order reaction.4.It was noted that after 6–7 hours at 275° or after 3 hours at 285° an equilibrium is established and further heating has scarcely any effect on the molecular weight of the polyester.5.A study was made of the polyesterification of bis-2-hydroxyethyl terephthalate in presence of catalysts lithium hydroxide and alumina. Catalysts increase the rate of reaction by a factor of 2–3.6.It was shown that polycondensation in presence of catalysts proceeds in accordance with second-order laws. |
| Databáze: |
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| Externí odkaz: |
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