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• W2001567374 abstract "Pure hard-block polyurethanes and amorphous segmented hydrogenated polybutadiene (H.PBD)-based polyurethanes have been synthesized under homogeneous conditions in solution. All amorphous semi-crystalline pure hard blocks show a glass transition temperature, Tg, detected by differential scanning calorimetry (d.s.c.), depending on the nature of the diisocyanate and of the chain extender. Segmented amorphous H.PBD polyurethane exhibits two glass transitions: a soft phase Tg(S) and a hard phase Tg(H). Thermal treatments show rearrangements in the two-phase materials. Quantitative evaluation of phase separation, as determined by the heat capacity change, ΔCp(S), at the glass transition of the soft phase, Tg(S), shows that the phase separation of the soft segments is in the range 85–95%. These particular non-polar soft segments force the polar hard segments in the hard phase to be well organized due to inter-urethane hydrogen bonding, which produces a higher Tg(H) in the segmented polyurethanes than the Tg of the pure hard blocks. The morphology of such polyurethanes with non-polar soft segments can be well characterized by dielectric measurements. Dielectric spectroscopy is in good agreement with d.s.c. results. A third transition between the soft and hard phase transitions has been detected. This relaxation is attributed to the mixed interfacial region. Increasing the hard-segment content increases this interfacial region." @default.
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• W2001567374 date "1991-01-01" @default.
• W2001567374 modified "2023-10-15" @default.
• W2001567374 title "Synthesis and properties of polyurethanes based on polyolefine: 1. Rigid polyurethanes and amorphous segmented polyurethanes prepared in polar solvents under homogeneous conditions" @default.
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• W2001567374 doi "https://doi.org/10.1016/0032-3861(91)90024-d" @default.
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