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托福听力练习-科学美国人60秒:聚合涂层

2017-05-07 09:11:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：聚合涂层

　　科学美国人60秒听力练习：聚合涂层

　　科学美国人60秒英文文本

　　Are your car’s bumpers riddled with scars fromencounters with tight parking spaces? Did thefurniture movers scratch your floor? Wouldn’t it begreat if those marks could just disappear? Well, thanks to the magic of chemistry, maybe such nicks will soon be nipped. Because scientistshave produced a material that can actually heal itself, work published in the journal Nature. [Mark Burnworth et al., "Optically Healable Supramolecular Polymers"]

　　The paint on your car, the varnish on your floor, even the nylon in your panty hose are allpolymers—extremely long chains of molecules held together by strong chemical bonds. Butthis new material isn’t like any old polymer. It’s a supramolecular polymer, made of smallermolecules held together by weak interactions with metals, which act like a kind of molecularVelcro.

　　When this polymeric material is torn, exposing it to an intense beam of UV radiation breaksthe weak bonds in and around the tear. That disruption allows the material to flow like aliquid, which then heals the wound. When the light is switched off the polymer resolidifies, leaving the surface as good as new. Which would be good news for your bumpers. And for yourteenager, who won’t have to explain the ding on your car.

　　—Karen Hopkin

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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