Gas separation membrane having shape memory property

A gas separation membrane, memory technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., to achieve the effect of large specific surface area and good gas separation selectivity
CN106902652AActive Publication Date: 2017-06-30LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2017-06-30

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Abstract

The invention discloses a gas separation membrane having a shape memory property; the gas separation membrane is prepared by the steps: firstly, forming a copolymerized linear oligomer from dianhydride 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, diamine 4,4'-diaminodiphenyl ether and 2-(4-aminophenyl)-5-aminobenzoxazole, then carrying out a reaction of the copolymerized linear oligomer with 2,4,6-triaminopyrimidine gradually to form hyperbranched macromolecules, and finally, carrying out thermal imidization to obtain a hyperbranched polyimide membrane. The hyperbranched polyimide membrane has large specific surface area and can achieve gas adsorption; by adjusting the stiffness and flexibility of a structure of polyimide, the hyperbranched polyimide membrane has different adsorption characteristics on different gases, so as to achieve gas separation characteristics. In addition, the hyperbranched polyimide has obvious glass transition temperature, the transition can be used as a shape memory reversible phase, mutual entanglement of macromolecular chains and intermolecular strong interaction force in the polyimide structure can be used as a stationary phase, and thus the hyperbranched polyimide is endowed with the shape memory property.
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Description

technical field

[0001] The invention relates to a gas separation membrane with shape memory performance. The gas separation membrane has good shape memory performance, gas separation and thermal stability. Background technique

[0002] Shape memory polymer (SMP) is a class of smart materials that can fix a temporary shape under certain external conditions and return to the original shape when external stimuli such as heat, light, electricity, magnetism, etc. are applied again. SMP has broad application prospects in the fields of flexible electronic devices, biomedicine, and aerospace. The most common type of SMP is thermotropic SMP, including: polyurethane, polystyrene, epoxy resin and other SMP materials. But the glass transition temperature (T g ) are mostly lower than 120 °C, thus limiting the application of shape memory polymer materials in harsh environments, such as aerospace. In order to broaden the application of shape memory polymers in complex environments, the ...

Claims

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