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Oregon State University Ecampus Online Chemistry Lecture - Polymer Strands

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Oh hi, I'd like to show you a little trinket involving polymers. The polymer here is polyvinyl propylene and polyvinyl propylene is sometimes used as a light adhesive. So there is gluing agents inside of hair gel. Now hair gel is water and this polymer. So we have here a little picture up on the board showing polymer strands that are interlocked. You can think of this as being some type of a matrix here. And so when somebody takes some and puts it on their hair these strands are coating the hairs, locking them into shape and so you hair has this shape for several hours, maybe all day. Now I am going to take a little bit of this, as some people do, and put it inside of a beaker. I guess so people put it on their hair. Let say you have a friend and they wear some hair gel in their hair. You might have a little falling out or be irritated because they have said something rude. You can destroy their hair for the day. They have their hair all gelled and we're going to put some salt, just regular table salt, sodium chloride, just a little bit...just a little bit in there. Now you can go ahead and just take some and sprinkle it on their hair. Now the sodium chloride is going to dissolve. It is going to break up this matrix. Na+ Cl- are going to interfere with these strands and we are going to end up with strands that are no longer interlinked. And so what we are going to get is something that is far far more liquid like and so they will have droopy hair for the day. So we've broken up the polymer matrix. Many times this is not desirable. Usually we like to make polymers, and something instead of be destructive. There is something else going on, and you have no opportunity to experience this on the video but many of these hair products have perfumes. Large perfume or cologne molecules inside of there. So think of these cologne molecules as being trapped inside the polymer strands of the matrix Well I just went ahead and busted it up and can tell you the smell is really great now because these have been released. When the polymer strands went straight...off go the perfumes. And so there's quite an odor here that's not unpleasant but just in high concentration.

Video Details

Duration: 2 minutes and 11 seconds
Country: United States
Language: English
Genre: None
Views: 112
Posted by: umarket on Sep 23, 2009

Video taken from an Online Chemistry course provided by Ecampus at Oregon State University. The topic of this lecture is on Polymer Strands by Dr. Richard Nafshun.

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