Effect of Hard-segment Flexibility on Phase Separation of Segmented Polyurethanes
Demonstrated in this paper is the kinetic factor which can control whether the structure in segmented polyurethanes is phase-mixed or phase-separated. According to the solubility parameters, UMDT has greater hard and soft segment incompatibility than UHDI, while HDI/HBPA in UHDI has higher mobility than MDI/HBPA in UMDI due to flexible HDI. There is no observable phase separation in the former, while the latter gave rise to nearly complete phase separation.
Y. Li et al., "Effect of Hard-segment Flexibility on Phase Separation of Segmented Polyurethanes," Macromolecules, American Chemical Society (ACS), Jan 1994.
The definitive version is available at https://doi.org/10.1021/ma00080a043
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© 1994 American Chemical Society (ACS), All rights reserved.