Areerat, Surat

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Areerat, Surat
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Areerat, S.
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surat.ar@kmitl.ac.th

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    Item type:Publication,
    Enhancement of molecular weight reduction of natural rubber in triphasic CO2/toluene/H2O systems with hydrogen peroxide for preparation of biobased polyurethanes
    (2019-01-28)
    Duereh, Alif
    ;
    Boonchuay, Chokchai
    ;
    Buahom, Piyapong
    ;
    Areerat, Surat
    Molecular weight reduction of natural rubber (NR) with hydrogen peroxide (H<inf>2</inf>O<inf>2</inf>) oxidizing agent is limited in biphasic water-toluene systems that is attributed to mass transfer. In this work, CO<inf>2</inf> was applied to the (aqueous H<inf>2</inf>O<inf>2</inf>)-(toluene-NR) systems with the objective of improving reaction efficiency. Experiments were performed on the reaction system with CO<inf>2</inf> at 12 MPa and at reaction temperatures and times of 60°C-80°C and 1 h-10 h to evaluate the reaction kinetics. CO<inf>2</inf> could enhance the NR molecular weight reduction by lowering the activation energy (from 121 kJ·mol<sup>-1</sup> to 38 kJ·mol<sup>-1</sup>). The role of CO<inf>2</inf> in the reaction system seems to be the formation of oxidative peroxycarbonic acid intermediate and promotion of mass transport due to the reduction in the toluene-NR viscosity and interfacial tension. The epoxidized liquid NRs (M<inf>n</inf>=4.9×10<sup>3</sup> g·mol<sup>-1</sup>) obtained from NR molecular weight reduction was further processed to prepare hydroxyl telechelic NR (M<inf>n</inf>=1.0×10<sup>3</sup> g·mol<sup>-1</sup>) and biobased polyurethane.