在线词典,在线翻译

特氟隆为何如此滑

所属:听力板块 来源:voa 阅读:2367 次 评论:0 条 [我要评论]  [+我要收藏]

小编摘要:1954年,法国工程师马克·格雷瓜尔的妻子柯莱特(Colette)突发奇想,觉得丈夫用来涂在钓鱼线上防止打结的不粘材料特氟龙(Teflon)如果可以用在煎锅上,效果一定不错。拯救了无数现代家庭主妇的“不粘锅”由此诞生。

 Why Teflon Is Slippery?


Teflon is the trademark name for PTFE, a type of plastic.

If you own any non stick cookware, then you probably use PTFE on a daily basis. You might not realize, as you fry your morning eggs, that PTFE is one of the most slippery materials that can be manufactured. It’s about as slippery as wet ice.

What makes Teflon so slippery?

Teflon is chemically similar to another, more common plastic: polyethylene, the material used to make plastic bags and other plastic containers.

Chemically, polyethylene is made from long chains of carbon atoms with hydrogen atoms bonded to the sides of the chains. To make Teflon, the hydrogen atoms of polyethylene are replaced by fluorine atoms.

Fluorine Atoms

It’s the fluorine atoms that give Teflon its slipperiness. Fluorine atoms are physically bigger than hydrogen atoms. Their large size makes them huddle around the central carbon chains in a much tighter formation.

This tight formation works like a kind of chemical armor, protecting the carbon atoms which in turn hold the molecule together.

Chemical Teamwork

This chemical teamwork between carbon and fluorine makes Teflon extremely chemically stable, and it’s this chemical stability that makes Teflon so slippery.

Foreign substances, like a frying egg, can find no chemical foothold on the fluorine armor, so they simply slide away.

Never Sticky

Getting this slippery substance to stick to a frying pan is a bit of a trick.

Teflon is broken into a fine powder and suspended in water. The pan is then thoroughly cleaned, then roughened by sand-blasting. The Teflon is sprayed onto the pan and baked, causing it to fuse together and lock onto the roughened surface of the pan.

As long as you don’t scratch this protective coating, years worth of fried eggs, melted cheese, burned milk even toffee will slide away effortlessly.

标签:听力文摘
1
2012-01-11 16:55 编辑:pliny
分享到:
关注海词微博:
发表评论:
表达一些您的想法吧!已有0条评论>>
登录,再发表评论
文明上网,理性发言!
您可能还感兴趣的文章:
  • [听力板块]利刃特别在何处

    大家都知道锋利的刀刃的切割性能胜过钝刀,但您知道确切原因吗?刀刃的作用就是把人们用在刀把上的力集中起来。
  • [听力板块]岩石怎么会出现在你的花园?

    我好奇有多少人在刚刚过去的春天修整了花园,准备大干一场,自以为去年早已清理干净了所有石块。看看花园角落里那一大堆战利品!现在所有石块肯定都被清理出来了。
>>精华推荐阅读
热门评论文章