The invention relates to a method for synthesising a thermoplastic elastomer comprising at least one polydiene block and at least one poly(α-methylstyrene) block. This method comprises the polymerisation steps comprising, successively: - polymerising the α-methylstyrene in an initial reaction medium comprising an anionic polymerisation initiator and an apolar solvent in the presence of a polar compound, the molar ratio of the polar compound to the metal of the polymerisation initiator being at least 0.03 and at most 15, with a mass ratio of the solvent to the α-methylstyrene of at least 0.5 and at most 5, and at a temperature higher than or equal to 0°C and lower than 30°C; - adding, in a single step, all of the monomer or monomers that are to constitute the polydiene block, the monomer or monomers comprising at least one conjugated diene monomer; - polymerising the monomer or monomers that are to constitute the diene block on the living poly(α-methylstyrene) chains obtained previously, at a temperature higher than or equal to the polymerisation temperature of the α-methylstyrene. The method of the invention makes it possible to synthesise a thermoplastic elastomer of controlled microstructure and controlled macrostructure, the thermoplastic block(s) of which are homopolymers of α-methylstyrene and may have a glass transition temperature higher than the glass transition temperature of polystyrene at 100°C, with a reduced number of steps and productivity that is economically compatible with industrial exploitation.


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    Title :

    PROCÉDÉ DE SYNTHÈSE D'UN ÉLASTOMÈRE THERMOPLASTIQUE COMPRENANT AU MOINS UN BLOC POLY(ALPHA-MÉTHYLSTYRÈNE)


    Additional title:

    METHOD FOR SYNTHESISING A THERMOPLASTIC ELASTOMER COMPRISING AT LEAST ONE POLY(ALPHA-METHYLSTYRENE) BLOCK
    VERFAHREN ZUR SYNTHESE EINES THERMOPLASTISCHEN ELASTOMERS MIT MINDESTENS EINEM POLY(ALPHA-METHYLSTYROL)BLOCK


    Contributors:

    Publication date :

    2024-04-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    French


    Classification :

    IPC:    C08F MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS , Makromolekulare Verbindungen, erhalten durch Reaktionen, an denen nur ungesättigte Kohlenstoff-Kohlenstoff-Bindungen beteiligt sind / B60C VEHICLE TYRES , Fahrzeugreifen




    PROCÉDÉ DE SYNTHÈSE D'UN ÉLASTOMÈRE THERMOPLASTIQUE COMPRENANT AU MOINS UN BLOC POLY(ALPHA-MÉTHYLSTYRÈNE)

    COSTE NATHALIE / DIRE CHARLOTTE / HABHAB KARIMA et al. | European Patent Office | 2020

    Free access

    PROCEDE DE SYNTHESE D'UN ELASTOMERE THERMOPLASTIQUE COMPRENANT AU MOINS UN BLOC POLY(ALPHA-METHYLSTYRENE)

    COSTE NATHALIE / DIRE CHARLOTTE / HABHAB KARIMA et al. | European Patent Office | 2021

    Free access