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The effects of hard segment content on microphase separation and physical properties of non-linear, segmented copolyureas formed by RIM

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Summary

The properties of RIM-copolyureas formed from a polyether triamine and containing 30 to 70% by weight of MDI/DETDA hard segments (HS) were investigated. As-moulded (mould temperature 115°C) and postcured (200°C/1h) materials were compared using DSC, DMTA and tensile stress-strain measurements. Phase separation ratios (PSR) of as-moulded materials increased from 47 to 56% with increasing HS content. Postcuring increased PSR to ∼70% for all materials resulting in significant intensification of HS glass transition at TgH (220 to 250°C), and reduced mechanical damping and modulus-temperature dependence between −40 and 200°C. Agreement between experimental tensile moduli and those predicted by appropriate two-phase composite theory has confirmed the co-continuous morphology of these RIM-copolyureas over the entire composition range studied.

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Author notes

  1. A. J. Ryan

    Present address: Department of Chemical Engineering and Materials Science, University of Minnesota, 55455, Minneapolis, MN, USA

Authors and Affiliations

  1. Polymer Science and Technology Group, Manchester Materials Science Centre, University of Manchester Institute of Science and Technology, M60 1QD, Manchester, UK

    A. J. Birch, J. L. Stanford & A. J. Ryan

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  1. A. J. Birch
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  2. J. L. Stanford
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  3. A. J. Ryan
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Birch, A.J., Stanford, J.L. & Ryan, A.J. The effects of hard segment content on microphase separation and physical properties of non-linear, segmented copolyureas formed by RIM. Polymer Bulletin 22, 629–635 (1989). https://doi.org/10.1007/BF00718945

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  • DOI: https://doi.org/10.1007/BF00718945

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