Micro-composite polymer/polymer materials with semicrystalline dispersed phase and preparation method

摘要

The invention concerns a micro-composite polymer/polymer material comprising 25 to 35 wt. % of a semicrystalline polymer (I), forming a dispersed phase localised inside a thermoplastic or elastomeric polymer (II) forming a matrix, the temperature of crystallisation of the polymer forming a dispersed phase being higher by at least 20° C. than the melting or softening point of polymer (II) forming the matrix, and the dispersed phase of said material having specifically a morphology such that it induces crosslinking of the continuous phase. The invention also concerns a method for obtaining said material comprising steps which consist in: extruding, at regulated temperature, said mixture of melted polymers, said regulation temperature being decreasing from the feeding zone (A) to the die zone (F) of said extruding machine (1) so that the temperature of the material in said die zone (F) is lower than the temperature of recrystallisation or solidification of polymer (I) and higher than the melting or softening point of polymer (II); and cooling at room temperature the resulting micro-composite material.