Abstract: The use of a composition including a mixture of at least one non-reactive thermoplastic polymer of Tg >40° C., especially >100° C., in particular >120° C., and at least one reactive thermoplastic prepolymer, with a fibrous material, for the preparation of a fibrous material impregnated with the composition, the composition having an initial melt viscosity during the impregnation, as measured in plate-plate rheology under 1 Hz and 2% strain, at a temperature of 300° C., of less than the viscosity of the same composition devoid of reactive prepolymer, measured under the same conditions, and/or a ductility, after in situ polymerization of the reactive thermoplastic prepolymer in the composition during the impregnation and after the impregnation, that is at least equivalent to the ductility of the same composition devoid of non-reactive thermoplastic polymer, and of which said reactive thermoplastic prepolymer is polymerized to the same number-average molecular mass (Mn).

Abstract: The present invention concerns an impregnated fibrous material comprising at least one continuous-fiber fibrous material in the form of a roving or a plurality of parallel rovings and at least one thermoplastic polymer matrix, characterized in that said at least one thermoplastic polymer is an amorphous or semi-crystalline polymer having a glass transition temperature such that Tg?40° C., especially Tg?100° C., in particular ?120° C., the fiber content of said impregnated fibrous material being from 45 to 65% by volume, preferably from 50 to 60% by volume, especially from 54 to 60% by volume, the number-average molecular mass Mn of said thermoplastic polymer being from 11,000 to 25,000 g/mol, the melt viscosity of said thermoplastic polymer being from 80 to 1500 Pa·s, as measured by plane-plane rheology at 1 Hz and 2% deformation, at a temperature of Tg+220° C.

Abstract: A composition results from the mixture of at least one copolymer A resulting from the copolymerization of at least one monomer functionalized by diol functions and at least one compound A2 comprising at last two boronic ester functions. They have rheological properties which are very varied according to the proportion of the A1 and A2 compounds used. The field is that of associative and exchangeable polymers.

Abstract: A composition results from the mixture of at least one copolymer A resulting from the copolymerisation of at least one monomer functionalised by diol functions and at least one compound A2 comprising at last two boronic ester functions. They have rheological properties which are very varied according to the proportion of the A1 and A2 compounds used. The field is that of associative and exchangeable polymers.