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

Author: Zani, Gerald

Subject: Re: Sad & Happy balls


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

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


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.


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 Thu Oct 29 16:41:25 2009