Microcapillary films and foams suitable for capillary action fluid transport

Microcapillary films and foams suitable for capillary action fluid transport

  • CN 104,245,290 B
  • Filed: 12/21/2012
  • Issued: 05/08/2020
  • Est. Priority Date: 12/22/2011
  • Status: Active Grant
First Claim
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1. A microcapillary film having a first end and a second end, wherein the film comprises:

  • (a) a matrix comprising a thermoplastic material, the matrix comprising a thermoplastic material,(b) one or more surface treated channels disposed in parallel in the matrix from the first end to the second end of the membrane, wherein the one or more surface treated channels are obtained by blowing a gas mixture into a capillary tube, the gas mixture comprising nitrogen and less than 1% by volume helium, and optionally up to 5% by volume hydrogen and/or ammonia, and then placing the capillary strip in a plasma zone for a fixed time, wherein the one or more surface treated channels are spaced at least 1 micron from each other, and wherein the one or more surface treated channels each have a diameter of at least 1 micron;

    wherein the microcapillary film comprises from 30% to 80% by volume of matrix, based on the total volume of the microcapillary film;

    wherein the microcapillary film comprises a void fraction of 30% to 60% by volume, based on the total volume of the microcapillary film;

    the thickness of the microcapillary film is 200-600 microns;

    wherein the one or more channels have a diameter of 5-10 microns;

    treating the microcapillary channels and optionally the microcapillary membrane surface with an atmospheric or low pressure plasma comprising a dielectrically impeded discharge of atomized functional molecules to change the surface energy;

    provided that the sum of the volume% of the matrix and the void fraction is 100%, based on the total volume of the microcapillary film.

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