METHOD OF MODIFYING POLYMER POROUS MATERIAL AND COMPOSITE MATERIAL OBTAINED USING SAID METHOD Russian patent published in 2015 - IPC B05D7/24 C08G61/02 C08F2/34 C08J7/04 

FIELD: chemistry.

SUBSTANCE: invention relates to polymer material engineering, particularly to modification of porous materials by forming coatings. Modified porous polymer material can be used to make components for use in different scientific and engineering fields, for example wicks for raising hydrocarbon liquids through a capillary effect, filter elements, carrier matrix for active low-molecular components as part of structures bearing a power load, for example, wings of a light aeroplane. The disclosed method includes forming, on the surface of structural elements of a matrix of the initial porous material, a continuous coating from a polymer with physical and mechanical properties different from that of the polymer of the matrix of the initial porous material. The coating is formed as a result of synthesis of a heat-resistant polymer - poly-para-xylylene via gas-phase polymerisation on the surface. Synthesis of a film of poly-para-xylylene is carried out at temperature of the walls of the polymerisation chamber of 20-25°C and pressure of the gaseous monomer (para-xylylene) of about 5-8 Pa, wherein directed movement of monomer molecules through the matrix of the initial porous material is facilitated in the chamber. Also declared is a composite porous material containing a matrix with through porosity and a continuous coating of poly-para-xylylene with thickness of 0.2-0.3 mm on the surface of structural matrix elements. The technical result is increasing heat resistance of the modified porous plastic 2-3-fold to 250-300°C (Vicat softening point); uniaxial compression strength of the modified material is significantly greater than that of the initial material ( 2 times greater); resistance of the modified porous plastic to solvents increases since the modifying coating dissolves at high temperature only in very strong solvents.

EFFECT: method significantly supplements the range of porous materials for various purposes.

2 cl, 3 dwg