PREPARATION OF POROUS ORGANIC POLYMERIC FILMS

摘要

Porous organic polymeric films having multiple discrete cavities can be prepared by applying a water-in-oil emulsion that includes a cavity stabilizing hydrocolloid on the inner walls of the multiple discrete cavities to a substrate. The multiple discrete cavities can also include organic catalytic materials for various catalytic reactions, markers materials for security applications, or the multiple discrete cavities can be used to increase opacity, hydrophobicity, or other desirable properties compared to nonporous organic polymeric films composed of the composition and dry thickness. Water and oil from the applied water-in-oil emulsion can be removed by evaporation in a suitable process, and the applied porous organic polymeric film can be provided as a uniform material or in a patternwise fashion.

主权项

1. A method for preparing a porous organic polymeric film, the method comprising:
providing: (a) an aqueous phase comprising a cavity stabilizing hydrocolloid, and (b) an oil phase comprising a water-insoluble polymer or polymer precursor and an organic solvent, dispersing the aqueous phase in the oil phase to form a water-in-oil emulsion, applying the water-in-oil emulsion to a substrate to form a wet coating containing droplets of the aqueous phase in the oil phase, and removing the organic solvent from the oil phase by evaporation, removing water from the aqueous phase by evaporation, and polymerizing the polymer precursor if present, to form a porous organic polymeric film comprising a continuous polymeric solid phase, and multiple discrete cavities having inner walls and that are uniformly dispersed within the continuous polymeric solid phase,
wherein the porous organic polymeric film further comprises the cavity stabilizing hydrocolloid on the inner walls of the multiple discrete cavities.