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Topic: Why does the benzene ring in the structure of P.E.T cause chain stiffness??  (Read 3266 times)

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Offline Doze

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Why does the benzene ring in the structure of P.E.T cause chain stiffness??
« on: October 23, 2011, 09:51:22 PM »
This is really bothering me, since I have to relate this to one of its properties.


Help would be much appreciated.
 
Thank you.
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Offline fledarmus

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Re: Why does the benzene ring in the structure of P.E.T cause chain stiffness??
« Reply #1 on: October 24, 2011, 07:29:03 AM »
compared to what?
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Offline Honclbrif

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Re: Why does the benzene ring in the structure of P.E.T cause chain stiffness??
« Reply #2 on: October 24, 2011, 09:57:06 AM »
Think about the bonding in benzene compared to, say, an aliphatic chain.
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Offline fledarmus

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Re: Why does the benzene ring in the structure of P.E.T cause chain stiffness??
« Reply #3 on: October 24, 2011, 10:45:26 AM »
Quote from: Honclbrif on October 24, 2011, 09:57:06 AM
Think about the bonding in benzene compared to, say, an aliphatic chain.

Or better yet, build a model of the repeat group in PET and of an alkyl chain of the same length. See which one is more flexible.
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Offline Kadabrium

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Re: Why does the benzene ring in the structure of P.E.T cause chain stiffness??
« Reply #4 on: October 25, 2011, 03:48:20 AM »
maybe π-πinteraction between chains constricted them
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