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- W1986166282 abstract "Hard-segment model compounds containing one to five 4,4′-methylene bis(p-phenylisocyanate) (MDI) units extended with 1,4-butanediol (BD) were synthesized. The ends of the model compounds were reacted with ethanol. The melting point (Tm) of the model compounds increased with the number of MDI units to an extrapolated value of 299°C for the homopolymer using Flory's equation accounting for chain end defects. The ΔH of fusion was 5.3 kcal/mol. Intrinsic viscosity measurements in DMA solutions revealed a Mark Houwink exponent of 1.43 suggesting that the hard-segment model compounds are rodlike in solution. Wide-angle X-ray diffraction showed that the percentage of hard-segment crystallinity decreased as the oligomer length increased. Infrared spectroscopy studies showed that the distribution of hydrogen bond distances between CO and NH groups became broader with increasing segment length." @default.
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- W1986166282 date "1984-07-01" @default.
- W1986166282 modified "2023-10-17" @default.
- W1986166282 title "Synthesis and characterization of MDI-butanediol urethane model compounds" @default.
- W1986166282 doi "https://doi.org/10.1002/pol.1984.170220714" @default.
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