Hydrophilizing PTFE membranes
A PTFE, hydrophilic technology, applied in membrane, membrane technology, semi-permeable membrane separation, etc., can solve the problem of time-consuming
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Embodiment 1
[0045] This example demonstrates a method for producing films using gas plasmas according to an embodiment of the invention.
[0046] A commercially available PTFE membrane (Sumitomo Electric Fine Polymer, Inc., nominal pore size 50 nm) was treated with argon / methane gas plasma at a gas flow rate of 15–20 ml / min for 30 min.
[0047] Membranes were placed in isopropanol (IPA) for 30 seconds and washed with deionized (DI) water for 1-2 minutes.
[0048] The membrane was placed in a 10% solution of polystyrene sulfonic acid (PSSA) or styrene sulfonic acid (SsA) for 30 min at room temperature.
[0049] The membrane was washed with deionized water for 16 h, oven-dried at 65 °C for 10 min, and the contact angle was measured with water.
[0050] At room temperature, using H 2 SO 4 (exposed to H at room temperature 2 SO 4 12 hours) and sulfuric acid peroxide mixture (SPM) solution to challenge the membrane for 16 hours. Before each challenge, the membrane was placed in IPA for 30...
Embodiment 2
[0058] This example demonstrates the use of broadband UV to prepare films according to one embodiment of the invention.
[0059] Prepare the dopamine solution as follows:
[0060] Tris-HCl buffer preparation: Mix 15 mmol of Tris-HCl buffer into one liter of DI-H 2 In O. pH ~ 5. Add 1N NaOH dropwise to raise to pH 8.8. Store buffer in an airtight container.
[0061]Dopamine preparation (prepared fresh at the time of coating): Add 0.1 g (2000 ppm) of dopamine-HCl powder at pH = 8.8 to a numbered 50 mL centrifuge tube containing Tris buffer and then cap again. Label Actual mass of dopamine added and correlating it to numbered centrifuge tubes. A color change from colorless to pale orange will occur as the dopamine dissolves.
[0062] Commercially available PTFE membranes (Sumitomo Electric Fine Polymer, Inc., nominal pore size 50nm) were pre-wetted with IPA, immersed in deionized water for 10-15 seconds, thereby replacing IPA with deionized water, and immersed in 0.15M sodium ...
Embodiment 3
[0070] This example demonstrates the use of broadband UV and thermal grafting to prepare films according to one embodiment of the invention.
[0071] Prepare the initiator (for thermal grafting) as follows: Dissolve 1.5 g of AIBN in 100 ml of water (solution A).
[0072] The grafting solution was prepared as follows: 10.0 g of monomeric 4-styrenesulfonic acid was dissolved in 100 ml of water (solution B).
[0073] A commercially available PTFE membrane (Sumitomo Electric Fine Polymer, Inc., nominal pore size 50 nm) was pre-wetted with IPA, immersed in deionized water for 10-15 seconds to replace IPA with deionized water, and immersed in 0.1 M sodium sulfite 10-15 seconds to replace the deionized water and soak the wells with sodium sulfite.
[0074] Expose the film to broadband UV (power = 200 mW / cm 2 ).
[0075] Control (native) and UV-treated membranes were coated as follows:
[0076] Place a 4 x 4' sized piece of BBUV-treated PTFE in Solution A (under nitrogen) for 1 h ...
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