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发信人: haha (等待...), 信区: material
标 题: 材料的世界--Polytetrafluoroethylene (Teflon)
发信站: 听涛站 (Mon Dec 4 15:29:51 2000), 转信
※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: M2-225-12.MIT.E]
发信人: stranger (???), 信区: Materials
标 题: 材料的世界--Polytetrafluoroethylene (Teflon)
发信站: BBS 水木清华站 (Fri Jan 24 01:43:57 1997)
Polytetrafluoroethylene (Teflon)
Polytetrafluoroethylene, or Teflon, is a linear polymer like polyethylene,
the only difference being that instead of hydrogen atoms there are fluorine
atoms. It has a very high crystallinity as manufactured - about 90 percent.
Teflon is insoluble in most solvents, uniquely nonadhesive, and has low
friction properties. Teflon has constant electrical and mechanical
properties from 20 to about 250 degrees Celsius, and it has high impact
strength. Teflon is typically used as coatings for frying pans, for wire and
cable insulation, and insulation for motors and generators.
The repeating unit of Teflon is -CF2-CF2- and the structure of teflon:
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※ 来源:.听涛站 cces.net.[FROM: 匿名天使的家]
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