Donghua University has researched nano-fiber membrane, which is waterproof, breathable and thermally conductive.

Release time:

2020-08-29

The team of Yu Jianyong of Donghua University has developed a nano-fiber membrane, which not only has good waterproof and moisture permeability, but also has excellent air permeability and thermal conductivity. It is made of a unique polymer matrix (polyurethane), hydrophobic fluorinated polyurethane and high thermal conductivity BN nanosheets mixed and electrospun. Researchers have obtained mutual penetration by controlling the loading rate of BN nanosheets and the relative humidity (RH) of the environment. The good BN network, and the porous structure of the BN network lays a good foundation for the air permeability and thermal conductivity of this film. At the same time, the synergistic effect of the hydrophobic polymer matrix and the improvement of the surface roughness of the membrane make this membrane also have good resistance to water permeability and superhydrophobicity.

The specific manufacturing process of this membrane is to prepare a spinning dope by dissolving FPU and DMAc and dispersing BN nanosheets at the same time, and then prepare an FPU /BNx membrane by electrostatic spinning after ultrasonic treatment (x is the concentration of BN nanosheets). The concentration of FPU was 6%, where the mass ratio of fluorinated polyurethane/polyurethane was 1/8, and the mass fractions of BN nanosheets were 0%, 6%, 12%, 18% and 24%, respectively.

The study was published in the journal ACS Applied Materials and Interfaces on June 19 this year.

1. Thermal conductivity test

The film has been tested to have an ultra-high in-plane thermal conductivity of 17.9 W/m-K, a transverse thermal conductivity of 0.29 W/m-K, and a high water vapor transmission rate (WVT) of 11.6 kg/m.²· Day. Through the modeling and calculation of the highest temperature, it can be clearly seen that the difference in thermal conductivity of FPU / BN0 film, FPU / BN18-RH90 film and FPU / BN18-RH50 film:

2. Hydrophobicity test

The water contact angle of the film is 153 ° and the hydrostatic pressure is 32 kPa.

3. Air permeability test

This kind of nanofiber membrane can not only be used in sports clothing to help the human body achieve more comfortable body temperature management, but also can be used in building materials to reduce the total energy consumption of building space refrigeration by exerting its air permeability, heat conduction and waterproof properties, which is conducive to the sustainable development in the future.

(source: textile guide official micro)

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