Polyether sulfone containing side group as well as preparation method and application thereof in gas separation membrane
A technology of gas separation membrane and polyethersulfone, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of unsatisfactory, low permeability of separation membrane, etc., and achieve high thermal stability, high The effect of heat resistance
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Embodiment 1
[0031] 10.8065g (0.05mol) of 3-methoxyphenylhydroquinone, 14.3580g (0.05mol) of 4,4'-dichlorodiphenylmethyl sulfone and 7.59g of anhydrous potassium carbonate, 100ml sulfolane, 40ml toluene Put it into a three-neck flask equipped with mechanical stirring and a water dispenser, raise the temperature to the reflux of the azeotropic dehydrating agent under the protection of nitrogen, react for 2.5 hours, remove toluene, and raise the temperature to 210-220°C to continue the reaction for 4 hours. The obtained polymer was precipitated in deionized water, pulverized, washed, and dried to obtain a white powder of polyethersulfone containing methoxy side groups. The glass transition temperature measured by DSC is 168°C, and the initial decomposition temperature measured by TGA is 452°C. The polymer structure is shown in the figure below:
[0032]
[0033] n=10-200.
[0034] The polyethersulfone polymer containing methoxyl side groups is paved into a dense membrane, and the membra...
Embodiment 2
[0036] Add 15 g of polyethersulfone containing methoxy side groups prepared by the method in Example 1 into the pyridine hydrochloride solution prepared from 360 ml of pyridine and 400 ml of concentrated hydrochloric acid, and react at 170° C. for 12 hours under nitrogen protection. The obtained polymer was precipitated in a large amount of ice water, filtered, washed and dried. An off-white polyethersulfone powder containing hydroxyl side groups was obtained. The glass transition temperature is 209°C, and the initial decomposition temperature measured by TGA is 480°C. The structure is as follows:
[0037]
[0038] Wherein n=10~180.
[0039] The polyethersulfone polymer containing hydroxyl side groups is paved into a dense membrane, and the membrane permeability P(O 2 ) = 0barrer, P(N 2 )=0.015barrer, selectivity α(O 2 / N 2 )=0.
Embodiment 3
[0041] By the polyethersulfone 1g (2.4012mmol) that contains hydroxyl side group that makes in the embodiment 2, the anhydrous potassium carbonate of 0.1657g, 2.7079g (12.006mmol) 2-chloro-5-nitrobenzotrifluorotoluene, 25ml N , N-dimethylacetamide (DMAc), 15ml toluene is put into the 100ml there-necked bottle that is equipped with mechanical stirring and belt water device, is heated up to azeotropic dehydrating agent reflux under nitrogen protection, reacts for 2 hours, gets rid of azeotropic dehydrating agent , and the temperature was raised to 160° C. to continue the reaction for 4 hours. The obtained polymer was precipitated in de-ethanol, pulverized, washed, and dried to obtain a white polyethersulfone powder containing trifluoromethyl side groups. The glass transition temperature was 171°C as measured by DSC, and the initial decomposition temperature as measured by TGA was 420°C. The polymer structure is shown in the figure below:
[0042]
[0043] n=10-160.
[0044...
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