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Guru

Join Date: Feb 2007
Location: Israel
Posts: 2968
Good Answers: 24

Color-Changing polymers

02/27/2007 4:13 AM

Can someone explain the workings of polymers changing their apparent color, by minute changes of temperature?

I once obtained those from Edmund's and was amazed. I was only told that the color is related to the energy-level of the outer-rim electrons.

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Guru
United States - Member - Engineering Consultant Popular Science - Evolution - Understanding

Join Date: Nov 2006
Location: Bay Shore, NY
Posts: 715
#1

Re: Color-Changing polymers

02/28/2007 8:22 AM

Hi Yuval,

(Am I safe in assuming this is not some AI implementation that has stolen your identity? )

There are many color changing polymers, that react to a variety of "stimulants": electrical, mechanical, temperature, etc.

Simply put, the polymers alter their molecular structure in response to the appropriate stimuli, changes in mechanical stress, tempertaure, etc, and in doing so the relative absorption and reflectance of various wavelengths of light is affected. In other words the color changes.

A few links:

http://www.uri.edu/news/releases/index.php?id=3277

http://pubs.acs.org/cen/topstory/8151/8151notw3.html

http://news.nationalgeographic.com/news/2006/04/0411_060411_thread_color.html

Regards, Greg

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Guru

Join Date: Feb 2007
Location: Israel
Posts: 2968
Good Answers: 24
#2
In reply to #1

Re: Color-Changing polymers

02/28/2007 8:30 PM

Yeah... I must be a Cyborg then...

Say,

...changes in mechanical stress, tempertaure, etc..

Like Piezo Compounds (isotropic/anisotropic lattice geometry)?

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Guru

Join Date: Feb 2007
Location: Israel
Posts: 2968
Good Answers: 24
#3
In reply to #1

Re: Color-Changing polymers

02/28/2007 8:40 PM

Or LCD come to think about it.

?

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