Microphase separation kinetics in segmented polyurethanes: effects of soft segment length and structure
β Scribed by Chu, Benjamin; Gao, Tong; Li, Yingjie; Wang, Jian; Desper, C. Richard; Byrne, Catherine A.
- Book ID
- 120018351
- Publisher
- American Chemical Society
- Year
- 1992
- Tongue
- English
- Weight
- 715 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0024-9297
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π SIMILAR VOLUMES
A series of polycaprolactone/4,4'-diphenylmethane diisocyanate/l,4-butanediol (PCL/MDI/ BDO) segmented polyurethanes of different compositions was synthesized by solution po- lymerization. The molecular weight of PCL diols used was in the range of 1600-7000. The crystallinity and morphology of these
The phase-separation process in segmented copolymers is treated by first-order kinetics which couples with the Fox equation to derive an expression for describing the change of soft segment T, with the annealing time. Kinetic data of five commercial polyurethanes have been analyzed. The studies conc