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Reaction kinetics of uncatalyzed and catalyzed reactions of 2,4-tolylene diisocyanate with various macrodiols in the molten state

โœ Scribed by R. Sojecki


Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
518 KB
Volume
40
Category
Article
ISSN
0323-7648

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โœฆ Synopsis


Reaction kinetics of uncatalyzcd aud catalyzed reactions of 2,4-tolylcne diisocyanate Actr Polyrncricr 40 (1989) Nr. 11 71 5 Reaction kinetics of uncatalyzed and catalyzed reactions of 2,4=tolylene with various macrodiols in the molten state diisocyanate R. SOJECKI N. Coperiiicus University, Institute of Chemistry, 87-100 Toruri/I'olatid

With a chemical method the rate constants of the uucatalyzed and catalyzed reactions of 2,4-tolylenc diisocyanate (TDI) with poly(ethy1ene maleate), poly(ethy1cne adipate), poly(ethy1ene glycol), poly(oxypropy1ene glycol), and butandiol-1,3 in the molten state were determined. Thc calculations were based on the differential-integral method following the scheme of consequent-parallel reactions. As a catalyst was used tri(tributy1tin)isocyanatc. An isokinetic dependence of the reactions of TDI with the studied macrodiols was found. The influence of temperature, changes of the initial conccntratioris of the reagents and of the catalyst on tlie rate of the polyaddition reaction of TDI with the macrodiols is discussed. A comparison of the results of the kinetic studies on the reaction of TDI with macrodiols in molten state and analogous reactions in solutions is carried out.

Reaktionskinetik der unkatalysierten und katalysierten Reaktionen von 2,4-Tolylendiisocyanat rnit verschiedenen Makrodiolen im geschmolzenen

Zustand hlit riner chemischen Methode wurdcn die Geschwindigkeitskonstanten der unkatnlysierten und katalysierten Reaktionen von 2,4-Tolylendiisocyanat (TDI) mit Poly(cthylenmaleat), Poly(ethylenadipinat), Poly(ethylenglycol), Poly-(oxypropylenglycol) und Butandiol-l,3 im geschmolzencn Zustand bestimmt. Die Bereclinungen erfolgten nach einem Schema von nacheinander und parallel ablaufenden Reaktionen niit Hilfe der Differential-Integral-Methode. Als Katalysator wurdc Tri(tributy1zinn)isocyanat eingesetzt. Zwischen den Reaktioncn von T D I mit den untersuchten Makrodiolen wurde ein isokinetischcr Zusammenliang gefunden. Dcr EinfluS


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