Patent ID: 11945930
Assignee: PARIS SCIENCES ET LETTRES
Field: Other special machines (Mechanical engineering)
Classification: CPC C | IPC C

Claim 0:
1. A process of preparation of an organic solid three-dimensional polymeric foam comprising: a solid continuous phase and pores,
wherein said solid continues phase is a cross-linked organic polymer,
wherein said pores are separated by plateau borders, the meeting points of said plateau borders forming nodes,
said solid three-dimensional polymeric foam:
a pore size comprised from 50 nm to 100 μm,
a volumetric fraction of the solid continuous phase comprised from 0.1 to 60%, with respect to the total volume of the foam,
a polydispersity index comprised from 1 to 30%,

wherein said solid three-dimensional polymeric foam is ordered over a volume of at least 100 pores,
said process comprising:
a step A of microfluidic bubbling of a gas phase through a liquid phase comprising a cross-linkable organic polymer, a cross-linking agent, a solvent and optionally a stabilizing agent, to obtain an organic liquid three-dimensional polymeric foam comprising a liquid continuous phase and bubbles, and
a step B of cross-linking of said liquid three-dimensional polymeric foam comprising a liquid continuous phase and bubbles, to obtain an organic solid three-dimensional polymeric foam comprising a solid continuous phase and pores,
said solid continuous phase being derived from the liquid phase, and said pores being derived from the bubbles,
said step A of microfluidic bubbling being carried out at a temperature from 0° C. to lower than 15° C., said temperature being low enough to inhibit the cross-linking reaction,
said step B of cross-linking being carried out after the step A of microfluidic bubbling and at a temperature comprised from 30 to 100° C., said temperature being high enough to trigger the cross-linking reaction,
said step A of microfluidic bubbling and said step B of cross-linking being carried out in separate reactors, and
step A being carried out in reactor A at a temperature from 0° C. to lower than 15° C. and step B being carried out in reactor B.