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Article Dans Une Revue Polymers and Polymer Composites Année : 2004

Synthesis, mechanisms and kinetics of formation of Bi-component polyurethanes

Résumé

In order to understand the single-step molten state reactivities of a diaromatic isocyanate (4,4' dPDhenylmethane diisocyanate MDI), the mechanisms and reaction kinetics were modelled using a monofunctional aromatic isocyanate (para-tolyisocyanate p-TI) and hydroxytelechelic polyols (polyethylene glycol PEG) (polypropylene glycol PPG) with variable macromolecular chains and structure (from 200 to 2000 g.mol(-1)). The molar ratio of reactive functions NCO/OH was set at 1.1. We were able to characterise the bi-component polyurethanes synthesised and identify side products formed (urea, trimer, allophanate...). The results were obtained by the use of a panoply of classical analytical techniques (NMR, FTIR, HPLC/UV/MS, ESI/MS, DSC) or those more recent in the field of synthetic polymers (MALDI-TOF). This work shows the necessity of using several efficient and complementary techniques in order to understand the molten state reaction mechanisms and kinetics of these complex PU systems.
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Dates et versions

hal-00511016 , version 1 (23-08-2010)

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  • HAL Id : hal-00511016 , version 1

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Nabil Ketata, Corinne Sanglar, Hughes Waton, Serge Alamercery, Frédéric Delolme, et al.. Synthesis, mechanisms and kinetics of formation of Bi-component polyurethanes. Polymers and Polymer Composites, 2004, 12 (8), pp.645-665. ⟨hal-00511016⟩

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