Besides the strength and skills of the anticipants themselves, outdoor sports also require the outdoor sportswear manage to adapt to bad weather and complex geographical conditions in order to protect the personal safety of their owner. By virtue of the factors of sports and outdoors, the requirements for outside sportswear are comparatively more strict. In outdoor exercises, there is much more heat and sweat produced, so the clothes must have good heat dissipation and drinking water vapor permeability; there will be rainy, windy, snowy or foggy days in the open air, so the clothes must remain water resistant.
The ability to resist h2o and to dissipate heat created by the body in the same time is hard to be obtained. Luckily, the sweat maded by human body is water vapor of single molecule state, while the rain and snow is liquid water drops in the state of aggregation. Volume of these two forms of h2o differs a lot. Besides, liquid water has a characteristic called rod mill which can be the characteristic to aggregate itself in volume. If you mix a drop of detergent with a water drop, the water drop will scatter flatly immediately because the detergent can lower its surface tension.
Sportswear of water resistant ability and drinking water vapor permeability perfectly makes use of this characteristic of water, surface tension. It applies PTFE (same chemical component but different physical structure with Polytetrafluor ethylene, PTFE, best corrosion resistance) coating on the surface of the fabric to raise the surface tension of the fabric in order that the water drops keep themselves together instead of scattering and infiltrating into the surface. In this way, h2o drops will not have the know-how to move through the clothes. Meanwhile, this PTFE coating is porous so the h2o vapor of single molecule state can with success go through the tiny holes in the fabric and be dissipated to the surface of the clothes.
After large level of movement, if we stop to rest in the rod mill, there may be drinking water drops inside our clothes since it's cold exterior and the sweat cannot be dissipated in time. It will make us feel not so comfortable. There is a kind of film of polyurethane (PU) and nano-ceramic powder which may be coated on the surface of the fabric so to absorb the sweat vapor when we are sweating. This coating will prevent the water vapor inside the clothes from turning into h2o drops because the drinking water vapor has surpassed the saturated vapor pressure.
Besides this characteristic, PTFE has other special functions. To illustrate, since PTFE has low-loss and small dielectric constant, PTFE film is becoming the perfect insulation material to make capacitors, insulated cables and transformers. PTFE film is also one of several indispensible materials of making electronic components in aviation and space industry, etc. Many characteristics of PTFE make PTFE be broadly applied in lots of fields like chemical engineering, petroleum, medicine, electronics and machinery.
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