Glass Transition Behaviors of a Polyurethane Hard Segment based on 4,4‘-Diisocyanatodiphenylmethane and 1,4-Butanediol and the Calculation of Microdomain Composition
✍ Scribed by Chen, Teng Ko; Chui, Jia Yeong; Shieh, Tien Shou
- Book ID
- 120065280
- Publisher
- American Chemical Society
- Year
- 1997
- Tongue
- English
- Weight
- 277 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0024-9297
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Dielectric relaxation measurements are reported on a series of segmented polyurethane elastomers produced with mixtures of varying 1:3 and 1:4 butanediol as chain extender. The changes observed in the glass transition temperature, activation energies for dipolar relaxation and the nature of the disp
## 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