Abstract
The substance under investigation is taken as a model for hard segments consisting of MDI 1) and 1,4-butane diamine. It crystallizes in the triclinic space group P¯1 witha=4.6297;b=5.8259;c=25.286 Å;α=90.721;β=91.580;γ=102.90 degrees andZ=1. Bond distances and angles are given, together with some data on the conformation.
The most significant finding is that neighbouring molecules in one and the same plane are linked to one another by means of bifurcated hydrogen bonds.
A comparison with the corresponding data for an analogous bis-urethane provides a plausible explanation of the main differences between diamine and glycol extension in polyurethane elastomers.
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Dedicated to Prof. Dr. R. Bonart on the occasion of his 60th birthday
1,1′-tetramethylene-bis-[[3-(4-phenyl methyl)-phenyl]-urea]
MDI=diphenylmethane-4,4′-di-isocyanate
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Born, L., Hespe, H. On the physical crosslinking of amine-extended polyurethane urea elastomers: A crystallographic analysis of bis-urea from diphenyl methane-4-isocyanate and 1,4-butane diamine. Colloid & Polymer Sci 263, 335–341 (1985). https://doi.org/10.1007/BF01412250
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DOI: https://doi.org/10.1007/BF01412250