The invention relates to a method for synthesizing a thermoplastic elastomer comprising at least one polydiene block and at least one other poly(α-methylstyrene) block. This method comprises the successive steps: 1. of polymerizing at least one diene monomer in a starting reaction medium comprising an anionic polymerization initiator and an apolar aprotic solvent; 2. of polymerizing α-methylstyrene to the living polydiene chain obtained in the preceding step comprising: a. at the end of step 1., maintaining the reaction medium containing the living diene elastomer obtained previously and α-methylstyrene at a positive temperature, below the ceiling temperature for the polymerization of α-methylstyrene; b. cooling the reaction medium obtained at the end of step a., to a temperature below 0°C; c. simultaneously, successively or prior to the cooling step, adding a purified polar aprotic solvent to the reaction medium with a volume ratio of the polar solvent to the apolar solvent of less than 1; and d. propagating the polymerization of α-methylstyrene to the living polydiene chain. The method of the invention makes it possible to synthesize a thermoplastic elastomer of controlled microstructure and controlled macrostructure, the thermoplastic block(s) of which are polymers of α-methylstyrene and may have a glass transition temperature above the glass transition temperature of polystyrene, with an increased 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 SYNTHESIZING 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:
    MATMOUR RACHID (author) / NGO ROBERT (author)

    Publication date :

    2021-07-14


    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



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    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

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    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