Experiments found that heat setting temperatures below 300°C will not significantly improve stability, while temperatures above 400°C will severely reduce the crystallinity, which will affect the pore structure of the ptfe waterproof and breathable membrane and seriously affect the mechanical properties.
The higher the heat setting temperature, the larger the average pore size of the PTFE waterproof breathable membrane. This is due to the increase in temperature, the decrease in crystallinity of the film, and the increase in the amorphous area.
The film pore formation occurs in the amorphous region, and the increase in the amorphous region provides space for the development of pore diameter.
Films set at higher temperatures have larger nodes and wider distances between nodes.
The nodes are connected to each other by microfibers in the membrane. The gaps between the microfibers are holes. The final pore size of the ptfe waterproof and breathable membrane is the result of the crisscross superposition of the microfibers. The size of the voids determines the size of the aperture.
?The number of nodes per unit volume is small, the gaps between microfibers are large, and the pore size must be large.
At the same time, experiments also found that as the heat setting temperature increases, the pore size distribution width increases and the pore size uniformity becomes worse.
As the heat setting temperature increases, the heat shrinkage rate decreases significantly.
This is because during the heat setting stage, the higher the temperature, the greater the thermal shrinkage of the film, and the more stable the size of the resulting film is.
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