In situ experiments were performed with a portable RIM (reaction injection molding) minimachine interfaced to an FTIR spectrophotometer to follow the reaction chemistry and monitor phase separation of copoly(urethane urea)s during RIM polymerization. The PUU copolymers were based on ethylene oxide-c
Crystallinity and hydrogen bonding of hard segments in segmented poly(urethane urea) copolymers
โ Scribed by Luo Ning; Wang De-Ning; Ying Sheng-Kang
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 584 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0032-3861
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Poly(urethane-urea)s (PUUs) from 2,4-tolylene diisocyanate (2,4-TDI), poly(oxytetramethylene)diols (PTMO) or poly(butylene adipate)diol (PBA), and various diamines were synthesized and characterized by Fourier transform infrared spectroscopy, gel permeation chromatography, differential scanning calo
## Abstract The study of a series of segmented poly(etherโurethanes) with highly flexible poly(oxytetraโmethylene) soft segments and especially designed, molecularly uniform poly(__N__โalkylurethane) hard segments based on piperazine and 1,4โbutanediol bischloroformate has shown that size, shape an