Curing is usually performed under a certain tension to ensure pore formation and dimensional stability of the film.
Curing temperature has a great impact on the pore size and porosity of the film.
PTFE waterproof and breathable membrane has excellent breathability, corrosion resistance, aging resistance, high temperature resistance and other properties.
According to the usage requirements, the pore diameter can be between 0.1-10um, the thickness can be between 2-100um, the porosity can reach 50%–80%, and there are up to hundreds of millions of micropores per square centimeter.
? As the curing temperature increases, the pore size and porosity of the PTFE waterproof breathable membrane increase, but the number of pores decreases. The reason may be that the temperature increases, the crystallinity of the film decreases, and the amorphous area increases.
The pore formation of the film occurs in the amorphous region. The increase in the amorphous region provides space for the development of pore diameter. From the scanning electron microscope photos, the film cured at a higher temperature has large nodes and large gaps between the nodes. The distance between the nodes is wide, and the nodes are connected to each other by fibrils in the membrane. The gaps between the fibrils are holes. The final film pore size is the result of the crisscross superposition of the fibrils. The gaps between the fibrils Size determines the size of the aperture.
The number of nodes per unit volume is small, the gaps between fibrils are large, and the pore size will inevitably increase.
High-temperature curing may also cause some fibrils to break, further increasing the pore diameter and reducing the number of pores.
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