Positive charged organic-inorganic hybrid membrane preparing method
A technology of positively charged and hybrid membranes, which is applied in the field of preparing positively charged organic-inorganic hybrid membranes, can solve the problems of high toxicity of TDI and limited sources of raw materials, and achieve good compatibility, good flexibility, and low organic content. high effect
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Embodiment 1
[0019] Using a 250ml four-neck bottle reaction kettle equipped with a magnetic stirrer, a nitrogen inlet and a dropping funnel, add a solution of polymethyl acrylate (Mn=8360) in dimethyl sulfoxide (DMSO), and add N-β dropwise under stirring. -Aminoethyl-γ-aminopropyltrimethoxysilane (A-1120), stirred and reacted at 60°C. The molar ratio of each component is polymethyl acrylate (calculated based on the content of ester groups): A-1120: DMSO = 1: 10: 10. Sampling at any time for infrared testing, ~1735cm -1 The absorption peak of the ester group gradually decreases, ~1640cm -1 With ~ 1570cm -1 The amide peak gradually strengthened, indicating that the aminolysis reaction proceeded smoothly. Stop the reaction when the ester group peak disappears substantially.
[0020] Precipitate the mixed liquid in the reactor with 2 / 1 (volume ratio) ethyl acetate and petroleum ether, wash several times, dry, take 5.0g (calculated as 0.018mol based on silicon content) and dissolve it in 15...
Embodiment 2
[0028] Using the same device and operating process as in Example 1, polymethyl methacrylate (Mn=9600) was used instead of polymethyl acrylate to obtain a positively charged organic-inorganic hybrid membrane with an anion exchange capacity of 1.0×10 -4 mol / g.
Embodiment 3
[0030] Using the same device and operating process as in Example 1, methyl methacrylate-methyl acrylate copolymer (Mn=11000, methyl acrylate content 35%) was used instead of polymethyl acrylate to obtain a positively charged organic-inorganic hetero Chemical membrane with anion exchange capacity of 1.5×10 -4 mol / g.
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