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Structure-property relations in non-linear, segmented copolyureas formed by reaction injection moulding, RIM

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Summary

Segmented copolyureas have been formed by RIM using a MDI-based polyisocyanate (RMA400) and mixtures of a polyether triamine (Jeffamine T5000) and diethyltoluene diamine (DETDA) chain extender. Hard segment (HS) content was varied between 35 and 65% w/w at a constant overall stoichiometric ratio of -NCO to -NH2 groups of 1.03. All the copolyureas were translucent and DSC confirmed their totally amorphous structure.

The copolyureas were shown by dynamic mechanical-thermal analysis to possess a two-phase morphology comprising polyether soft segments of constant Tgs of −40°C and aromatic polyurea hard segments with TgH increasing from 215 to 236°C as HS content increased. The ratio of flexural moduli at −35 and 65°C, decreased from 4.9 to 2.2 at 65% HS, and mechanical integrity was retained at temperatures in excess of 250°C, with flexural moduli of 10MPa at 270°C.

Tensile stress-strain studies showed the polyureas to range from semi-rigid elastomers to stiff plastics with moduli greater than IGPa. Postcuring significantly improves materials toughness at high HS contents.

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Authors and Affiliations

  1. Department of Polymer Science and Technology, University of Manchester, M60 1QD, Manchester, UK

    A. J. Ryan, J. L. Stanford & A. N. Wilkinson

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  1. A. J. Ryan
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  2. J. L. Stanford
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  3. A. N. Wilkinson
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Ryan, A.J., Stanford, J.L. & Wilkinson, A.N. Structure-property relations in non-linear, segmented copolyureas formed by reaction injection moulding, RIM. Polymer Bulletin 18, 517–523 (1987). https://doi.org/10.1007/BF00255336

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  • DOI: https://doi.org/10.1007/BF00255336

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