| abstract |
The invention relates to thermoplastic compositions comprising a polymer matrix and an additive for modifying the rheological behavior of the matrix in the molten state. The aim is to find a preferably non-reactive additive dispersible in the matrix and capable of providing a good compromise between properties. rheological / mechanical properties According to the invention, the additive is a hyperbranched polyamide functionalized by R2 radicals of the type: substituted or unsubstituted hydrocarbon, of the silicone, linear or branched alkyl, aromatic, arylalkyl, alkylaryl or cycloaliphatic type which can include one or more unsaturations and / or one or more heteroatoms Excluded are PAHBs causing in the composition a decrease in the molar mass of the matrix M greater than or equal to 7% compared to a control composition comprising a matrix M and free of 'PAHB additive (s), the mass measurement preferably being carried out according to a determined P protocol. Applications: molding, extr usion, engineering plastics, composites, yarns and fibers. |