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The physical crosslinking of polyurethane elastomers studied by X-ray investigation of model urethanes

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Abstract

Polyurethane elastomers extended with aliphatic glycols or diamines, show a characteristic fluctuation in their thermal and hydrothermal properties which is dependent on the number of CH2 groups in the chain extender (“even” or “odd”).

The causes of this behavior are examined in the following report using X-ray crystallographic analyses of single crystals of model urethanes. These model compounds were prepared by reaction between diphenylmethane -4-mono-isocyanate and glycoles of the HO-(CH2)n-OH structure withn=2 to 6.

Whilst strain-free hydrogen bonds can form between neighboring molecules in urethanes with “even” chain extenders, significant strains occur in urethanes containing “odd” chain extenders which result in reduced stability of the physical crosslinking system.

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Author notes

  1. L. Born

    Present address: Zentralbereich Forschung und Entwicklung (Research and Development Division), Bayer AG, Leverkusen, Federal Republic of Germany

Authors and Affiliations

  1. Zentralbereich Forschung und Entwicklung (Research and Development Division), Bayer AG, Leverkusen, Federal Republic of Germany

    H. Hespe, J. Crone & K. H. Wolf

Authors
  1. L. Born
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  2. H. Hespe
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  3. J. Crone
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  4. K. H. Wolf
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Additional information

In memoriam to Prof. Dr. Dr. h. c. mult. Otto Bayer.

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Born, L., Hespe, H., Crone, J. et al. The physical crosslinking of polyurethane elastomers studied by X-ray investigation of model urethanes. Colloid & Polymer Sci 260, 819–828 (1982). https://doi.org/10.1007/BF01419091

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  • DOI: https://doi.org/10.1007/BF01419091

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