Abstract: An infusible three-dimensional network of crosslinked acrylic-type polymer fibers, where the diameter of the fibers is between 0.1 and 1.5 ?m, the size of the interstices between the fibers is between 0.1 and 50 ?m2 and the stiffness of the network includes an elastic modulus between 0.01 and 10,000 kPa.

Abstract: A subject of the invention is an infusible three-dimensional network of crosslinked polymer fibres, suitable as a cell support, and in particular characterized in that the diameter of said fibres is comprised between 0.1 and 1.5 ?m, the size of the interstices between said fibres is comprised between 0.1 and 50 ?m2, and the stiffness of said network is characterized by an elastic modulus comprised between 0.01 and 10,000 kPa, preferably between 0.1 and 10,000 kPa, preferably between 0.1 and 1,000 kPa, more preferentially between 0.1 and 300 kPa. Another subject of the invention is a process for preparing a three-dimensional network of crosslinked polymer fibres, comprising a step of synthesis of said network by electrospinning of a solution of acrylic-type polymer, more particularly PAN, which is optionally supplemented by a stiffening agent, followed by a step of heat treatment under an oxidizing atmosphere and at a temperature comprised between 40° C. and 400° C., preferably between 200° C. and 300° C.