????1. Strength (high strength-to-weight ratio) 2. Chemical inertness 3. Biological adaptability 4. High thermal resistance 5. High chemical resistance in harsh environments 6. Low flammability 7. Low friction coefficient 8 .Low dielectric constant 9. Low water absorption 10. Good weathering properties Detailed introduction: PTFE bubble point membrane is a polymer of tetrafluoroethylene.
The English abbreviation is PTFE.
The trade name is “Teflon”.
It is known as the “King of Plastics”.
The basic structure of polytetrafluoroethylene is.-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-CF2-. Polytetrafluoroethylene is widely used in various applications that require resistance to acids, alkalis and organic solvents. Yes, it itself is not toxic to humans, but one of the raw materials used in the production process, perfluorooctanoate (PFOA), is considered to be potentially carcinogenic.
The relative molecular weight of PTFE bubble point membrane is relatively large, ranging from hundreds of thousands to more than 10 million, and generally millions (the degree of polymerization is on the order of 104, while polyethylene is only 103).
Generally, the crystallinity is 90~95%, and the melting temperature is 327~342℃.
The CF2 units in the PTFE bubble point membrane molecules are arranged in a zigzag shape. Since the radius of the fluorine atom is slightly larger than that of hydrogen, the adjacent CF2 units cannot be completely trans-cross-oriented, but form a spiral twisted chain. Atoms cover almost the entire surface of the polymer chain.
This molecular structure explains the various properties of PTFE bubble point membrane.
When the temperature is lower than 19°C, a 13/6 helix is formed; at 19°C, a phase change occurs, and the molecule unwinds slightly to form a 15/7 helix.
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