A method for preparing a flexible porous membrane capable of identifying polar and non-polar gases and applications thereof

CN121537672BActive Publication Date: 2026-06-26DALIAN MARITIME UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN MARITIME UNIVERSITY
Filing Date
2026-01-16
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing gas-sensitive materials have poor flexibility, complicated preparation steps, and difficulty in effectively identifying multiple polar and non-polar gases in complex gas environments. Traditional devices have complex structures and cannot work independently.

Method used

Composite carbon powder PDMS substrates with different pore sizes were synthesized using the sacrificial template method. Flexible porous membranes were formed through self-assembly, and F/H-containing molecular chains were inlaid on the membrane surface to identify gases by utilizing electronegativity differences.

Benefits of technology

It improves the specific surface area and gas recognition capability of the material, enabling the recognition of multiple polar and non-polar gases, simplifying the device structure and providing self-powered capability.

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Abstract

The application discloses a preparation method and application of a flexible porous membrane capable of identifying polar and nonpolar gases, and comprises the following steps: step 1, stirring and uniformly mixing a prepolymer with a curing agent, adding a mixture of carbon black and a sacrificial template, uniformly mixing by ultrasonic, vacuumizing to remove bubbles, and heating and curing to obtain a composite of the membrane and the sacrificial template; step 2, removing the sacrificial template in the composite by using a template removing agent, cleaning and drying by using a cleaning agent to obtain a flexible porous PDMS base; and step 3, placing the flexible porous PDMS base in a radio frequency of a plasma cleaner, placing the flexible porous PDMS base after radio frequency in a solvent containing a crosslinking agent, avoiding light, standing, cleaning and drying to obtain the flexible porous membrane. The preparation method introduces carbon powder to enhance the electric signal after contacting with the gas, and the F / H-containing molecular chain is connected in the surface and the hole of the membrane through self-assembly, and due to the difference in electronegativity of F / H, corresponding electric signals of different polar gas molecules are presented to distinguish the gas.
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