Preparation of Monoepoxy-terminated Polysiloxane Modified Gelatin Amphiphile by Solvent Precipitation
A solvent precipitation method and single epoxy sealing technology, applied in the field of amphiphilic membranes, can solve the problems of poor water resistance and corrosion resistance, strong plastic feeling, affecting membrane structure, membrane performance and membrane application, etc., to achieve good weather resistance and surface Low tension and good thermal stability
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Embodiment 1
[0026] Add 0.3g of surfactant and 95g of deionized water into a three-neck reaction flask equipped with a thermometer socket, a sampling port, and a condenser socket, stir and heat to 50°C, and after the surfactant is completely dissolved, add 0.65mL of 2 mol / L sodium hydroxide, adjust the reaction pH to be 10.0, add 5g gelatin (accounting for 5% of the total mass of the solution), continue to stir until the gelatin is completely dissolved, and then add monoepoxy-terminated polydimethylsiloxane continuously or in batches ( Mw=1000), the consumption of single epoxy-terminated polydimethylsiloxane is 0.8 times of the primary amino molar weight in the gelatin molecule, and the reaction starts, and the primary amino content in the reaction system no longer changes in 24 hours, stops Stir and heat to obtain a single epoxy-terminated polydimethylsiloxane modified gelatin solution.
[0027] Infrared spectrum of single epoxy-terminated polydimethylsiloxane modified gelatin ( figure ...
Embodiment 2
[0030] The described method is consistent with Example 1, the only difference is that the volume ratio of ethanol to the mixed solution is 2:1.
[0031] Measure 0.5 ml of the mixed solution and drop it on the polytetrafluoroethylene substrate, let it stand for 12 to 18 hours, and dry it in a normal pressure oven at 45°C to obtain a modified film. The gas-liquid surface contact angle is 97°±2, and the solid-liquid surface contact angle is 83°±2. One side of the membrane is hydrophilic and the other side is hydrophobic.
Embodiment 3
[0033] The described method is consistent with Example 1, the only difference is that the volume ratio of ethanol to the mixed solution is 3:1.
[0034] Measure 0.5ml of the mixed solution and drop it on the polytetrafluoroethylene substrate, let it stand for 12 to 18 hours, and dry it in a normal pressure oven at 45°C to obtain a modified film. The gas-liquid surface contact angle is 123°±2, and the solid-liquid surface contact angle is 78°±2. One side of the membrane is hydrophilic and the other side is strongly hydrophobic.
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