Ultraviolet activated substances

  • Thread starter Ez4u2cit
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  • #1
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Main Question or Discussion Point

I recently purchased a bonding agent that is activated by an ultraviolet light (provided as part of the package). After three seconds of exposure to the UV light, the liquid substance turns rock hard. I believe they use the same process with modern dental fillings. Can anyone explain what is the physics/chemistry involved in this reaction.
 

Answers and Replies

  • #3
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Thanks. I was looking for the actual mechanism whereby the UV light induces the polymerization.
 
  • #4
314
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The UV light creates a free radical. Then the monomers polymerize via free radical polymerization.
 
  • #5
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So why UV light? Is this strictly because it is short wavelength/high energy. In which case, would x-rays work?
 
  • #6
314
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No, the frequencies of X-rays are too high. The freqeuncy of the incident radiation has to be resonant with the electrons in the bond.
 

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