Date: Thu Oct 29 16:41:25 2009 ** **Back to Contents ** ------------------------------------------------------------------------ **

Author: Zani, Gerald

Subject: Re: Sad & Happy balls

Post:

Why does do the increase in the crosslinks make the ball not bounce? - J

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Dale E. Stille
Sent: Thursday, October 29, 2009 4:28 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Sad & Happy balls

JZ,

They are also different polymers. The bouncy is usually just regular
neoprene rubber which has long chains, the non-bouncy is usually some
form of polynorbornene which has long chains with circular pentane
crosslink structures.

Dale

Zani, Gerald wrote:
> Folks,
>
> Why does one ball bounce and the other is "sad" and does not bounce?
>
> Is it due to the cross-links that the sad ball does not bounce?
>
> Why does more cross-links cause the sad ball to not bounce?
>
>
> Thanks,
> - JZ
>



From tap-l-owner@lists.ncsu.edu Thu Oct 29 16:41:25 2009
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