Modelling of urethane formation
✍ Scribed by Jönsson, Kersti ;Flodin, Per
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1990
- Tongue
- English
- Weight
- 371 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0007-1641
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✦ Synopsis
Abstract
The formation of polyurethanes has been followed by in‐situ ^1^H NMR. The experimental data have been used in a mathematical model. The model was found to be representative for a major part of the reaction. The Arrhenius preexponential factors and activation energies for the formation reactions were calculated based on the model.
📜 SIMILAR VOLUMES
Polyisobutylene-based model urethane networks have been prepared by crosslinking liquid a,odi(hydroxyl)polyi.vobutylenes, i.e., PIBdiols carrying exactly two =CH20H functions, F. = 2.0 \* 0.1, and rather narrow molecular weight distributions, MJM. = 12-1.6, with tritriphenylmethyl isocyanate HC&pCs
Poly(ester urethane ureas) (PesURUs) and poly(ether urethane ureas) (Pe-tURUs) synthesized from diphenylmethane-4,4Ј-diisocyanate and poly(butylene adipate) diol, and poly(tetramethylene oxide) diol or poly(propylene oxide) diol, respectively, were hydrolyzed at 70°C for various periods up to 16 wee