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Radical and catalytic polymerizations of alpha-olefins : towards CO2-incorporation

Abstract : This thesis focuses primarily on the utilization of CO2 in radical and catalytic polymerizations of a-olefins. Polyethylene was synthesized by a free radical polymerization process in supercritical CO2 (scCO2) under mild conditions (T? 100 °C, P? 300 bar) without addition of any initiator diluent, using AIBN, lauroyl peroxide, or benzoyl peroxide to investigate different initiation modes. The decarboxylation of the latter can be suppressed in scCO2 to yield ester-functionalized polyethylene. Furthermore, an interaction between triethylaluminum (AlEt3) and radicals was unveiled, the effect of AlEt3 on ethylene radical polymerization was investigated showing its role as an irreversible chain-transfer agent in this process. This interaction in conjunction with the reactivity of AlEt3 towards CO2 were harnessed to allow for CO2-incorporation within polyethylene chains. Thus, since CO2 was incorporated within the polyethylene chains using AlEt3, CO2 for the first time behaved as an effective reagent in ethylene radical polymerization. On the other hand, ethylene-isoprene random and block copolymerizations via iron-catalyzed chain shuttling processes have been achieved. Subsequently, each monomer was polymerized in supercritical CO2 using its corresponding dedicated iron catalyst in order to achieve sustainable processes to polymerize these monomers with the hope of incorporating some carboxylic moieties. Trials to functionalize polyolefins by CO2 using various strategies is an area of interest in the upcoming work of our laboratory
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Submitted on : Saturday, July 6, 2019 - 1:03:59 AM
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  • HAL Id : tel-02175725, version 1



Ali Al Rida Hmayed. Radical and catalytic polymerizations of alpha-olefins : towards CO2-incorporation. Polymers. Université de Lyon, 2018. English. ⟨NNT : 2018LYSE1185⟩. ⟨tel-02175725⟩



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