Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties

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Arun, Araichimani and Baack, Kasper K.J. and Gaymans, Reinoud J. (2009) Polyurethane tri-block copolymers - Synthesis, mechanical, elastic, and rheological properties. Polymer Engineering and Science, 50 (4). pp. 747-755. ISSN 0032-3888

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Abstract:A series of polyurethane tri-block copolymers were synthesized by reacting a 4,4′-methylenebis(phenyl isocyanate) (MDI)-endcapped poly(tetramethylene oxide) (PTMO, Mn = 2,000 g/mol) with a monoamine-diamide (6T6m) hard segment (HS). The concentration of the HS in the copolymer was varied between 9 and 33 wt % by changing the length of the soft mid-block segment. The structure of the copolymers was analyzed by nuclear magnetic resonance, the amide crystallinity was investigated by Fourier transform infra-red and the thermal properties were studied by differential scanning calorimetry. The mechanical and elastic properties of the tri-block copolymer were subsequently explored by dynamic mechanical analysis, compression set and tensile experiments, and the melt rheological behavior was studied by a parallel plate method. The amide end groups displayed a high crystallinity and the modulus of the tri-block copolymers was relatively high. The fracture strain increased strongly with the molecular weight and the copolymers demonstrated a ductile fracture behavior for molecular weights above 6000 g/mol. Good compression set values were obtained for the tri-block copolymers despite their low molecular weight. In the molten state, the tri-block polymers displayed a gelling effect at low frequencies, which was believed to be a result of a clustering of the end-segments. POLYM. ENG. SCI., 2010.
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Copyright:© 2009 Wiley
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Link to this item:http://purl.utwente.nl/publications/72581
Official URL:http://dx.doi.org/10.1002/pen.21579
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