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Introduction of phosphorus into the polyethyleneterephthalate molecule—IV. A study on the influence of the modifier on the properties of the pre-condensation mixture—I

✍ Scribed by K. Troev; At. Grozeva; G. Borisov

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
279 KB
Volume
15
Category
Article
ISSN
0014-3057

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✦ Synopsis

There is an investigation of the influences of the type and concentration of modifier (bis(2hydroxyethyl)phosphite or the sodium salt of diethylphosphite) on the transesterification processes during polyethyleneterephthalate formation, as well as on the properties of the pre-condensation mixture. The rates of the side-reactions caused by the modifier are found to decrease when the sodium salt of diethylphosphite is employed. The characteristics of the pre-condensation mixture are close to those obtained with modifier-free mixtures.

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Introduction of phosphorus into the poly
Introduction of phosphorus into the polyethyleneterephthalate molecule via disodium 1,2-dicarbomethoxyethylphosphonate—I. A study on the influence of the modifier-disodium 1,2-dicarbomethoxyethylphosphonate-on the properties of the pre-condensate
✍ K. Troev; At. Grozeva; G. Borisov 📂 Article 📅 1981 🏛 Elsevier Science 🌐 English ⚖ 231 KB

The effect of the concentration of disodium 1,2-dicarbomethoxyethylphosphonate as modifier in the trans-esterification stage of polyethyleneterephthalate preparation has been studied. It has been found that trans-esterification proceeds normally at modifier concentrations of up to 9°~ by weight, in