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.
PROCÉDÉ DE SYNTHÈSE D'UN ÉLASTOMÈRE THERMOPLASTIQUE COMPRENANT AU MOINS UN BLOC POLY(ALPHA-MÉTHYLSTYRÈNE)
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
2021-07-14
Patent
Electronic Resource
French
European Patent Office | 2024
|European Patent Office | 2017
|European Patent Office | 2020
|European Patent Office | 2017
|European Patent Office | 2021
|