The dielectric relaxation processes in polyurethanes based on 4,4'-diphenylmethane diisocyanate (MDI) and both saturated and unsaturated polyesters were studied in the range 240-410 K using thermally stimulated depolarization currents method (TSDC). The structure of the TSDC spectra and the location
✦ LIBER ✦
Thermal degradation of urethanes based on 4,4′-diphenylmethane diisocyanate and 1,4-butanediol (MDI/BDO)
✍ Scribed by W.P. Yang; C.W. Macosko; S.T. Wellinghoff
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 534 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0032-3861
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## Abstract 1,4:3,6‐Dianhydrosorbitol (DAS) seems to be an interesting reagent for the synthesis of polyurethanes. In the present work, the kinetics of the reaction of DAS with a monoisocyanate (__p__‐tolyl isocyanate, __p__‐TI) and with a diisocyanate (4,4′‐diphenylmethane diisocyanate, MDI) were