The pH sensitive film with polyvinylidene fluoride/polyurethane mixture film as base film and its prepn process
A polyvinylidene fluoride and preparation process technology, applied in the field of polymer film material preparation, can solve problems such as poor biocompatibility of pH-sensitive membranes
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[0021] (2) The steps of the photografting preparation method of the pH sensitive film are as follows:
[0022] 1) Immerse the polyvinylidene fluoride / polyurethane blend base film in absolute ethanol for 1-2 hours.
[0023] 2) Then put the basement membrane into a Soxhlet extractor and extract it with absolute ethanol for 12-15 hours to remove the residual solvent and additives in the basement membrane.
[0024] 3) Prepare the grafting liquid according to the proportioning of the above-mentioned grafting liquid.
[0025] 4) Continuously feed nitrogen into the grafting liquid to remove oxygen, and make the grafting liquid bubble.
[0026] 5) Immerse the base film in the grafting solution so that the liquid level just covers the surface of the film, and take out the film after irradiating ultraviolet light for 100-200 seconds in a nitrogen atmosphere.
[0027] 6) Rinse the grafted membrane with a water bath at 40-60°C for 5-7 hours
[0028] The present invention is described i...
Embodiment 1
[0030] Prepare membrane solution : 12.6% of polyvinylidene fluoride, 1.4% of polyurethane, 7.5% of polyethylene glycol, and 78.5% of N,N-dimethylacetamide in the film-forming solution. Stir at 58°C. After the polymer is completely dissolved, continue to maintain the temperature and stir for another 10 minutes to form a homogeneous film-forming solution. The membrane-forming solution was left to stand at 58° C. for 24 hours.
[0031] film making : The film-making liquid adopts the salivation method to scrape the nascent film on a clean glass plate. The nascent film evaporates in the air for 65s. Then the glass plate and the nascent film on it were immersed in deionized water, and the gel solidified to obtain the base film.
[0032] surface photografting : (1) Pretreatment of the basement membrane: Blot the surface moisture of the basement membrane and put it into absolute ethanol, extract with a Soxhlet extractor for 11 hours to remove the residual solvent and additives...
Embodiment 2
[0035] Prepare membrane solution : 10% of polyvinylidene fluoride, 4% of polyurethane, 7.5% of polyethylene glycol, and 78.5% of N,N-dimethylacetamide in the film-forming solution. Stir at 60°C. After the polymer is completely dissolved, continue to maintain the temperature and stir for another 10 minutes to form a homogeneous film-forming solution. The membrane-forming solution was left to stand at 60° C. for 25 hours.
[0036] film making : The film-making liquid adopts the salivation method to scrape the nascent film on a clean glass plate. The nascent film evaporates in the air for 60s. Then the glass plate and the nascent film on it were immersed in deionized water, and the gel solidified to obtain the base film.
[0037] surface photografting : (1) Pretreatment of the basement membrane: after absorbing the surface moisture of the basement membrane, put it into absolute ethanol, extract with a Soxhlet extractor for 12 hours to remove the residual solvent and addit...
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