On Mar 21, 6:33*pm, Pete Keillor wrote:
On Sun, 21 Mar 2010 17:16:00 -0400, I am Tosk

...

[The context here is epoxy and what happens if it is not quite
thoroughly mixed. -- FF]


I think I get it. In simple terms can I assume parts or molecules of
resin that are not activated by the correct molecules of activator, will
just stay resin and never really "harden" (for lack of a better term)?

Pretty much. *More likely, the molecule would be reacted on one end
and not the other. *Reaction kinetics will usually favor one end
reacting first. *The end result is lower crosslink density, unreacted
groups, and less than full development of cured properties.


Thanks.

The late Peter Van Dine worked almost exclusively with polyester
resin. One of the reasons he stated for his preference was that
that, in contrast to the situation described above for epoxy, once
the crosslinking was initiated it would eventually spread through
the entire matrix.

This is what led me to ask if the same was true for UV cured
polyesters.

So, I am now led to ask if he was correct.

And now we have come full circle.

--

FF