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Re: [PSUBS-MAILIST] PSUB Fatalities...View Ports...Shatterproof
Paul the explanation wasnt boring, I cannot say the same for the joke...
there is any table wich i can look some testing on pressure cycles and the
effect on plastics.
thanks.
----- Original Message -----
From: Paul Suds <paul_suds@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, March 09, 2000 11:25 PM
Subject: Re: [PSUBS-MAILIST] PSUB Fatalities...View Ports...Shatterproof
> Polycarbonate are formed from complex monomers like benzene rings
(aromatic)
> which are incorpoarted into the chain links. In comparison to polyethylene
> which uses just plain old Carbon monomer (Carbon molecule), the
> Polycarbonate chains use benze carbon and oxygen, thus the "complex" part.
> Because the bonding in the polycarbonate are stronger (remember the double
> bonds of benzene in organic chemistry). plus the double (covalent) bond of
> oxygen with carbon, versus single with hydrogen, rotating and sliding of
the
> chains is more difficult (than say polyethylene), leading to higher
> strengths, higher stiffnesss, and higher melting points than simpler
> polymers. It's amazing to me the impact strength of polycarbonate compared
> to acrylic (16 vs 2.6 ftlb/inch). Additionally, Polycarbonate has
extremely
> high creep resistance for a thermoplastic. I don't have my creep curves so
I
> can't give you specifics, but it's better than rigid PVC, for example .
> Finally, polycarbonate is considered an engineering plastic. That means
that
> it has various properties that are superior to many commodity and
> intermediate plastic groups.
> If this was boring, it wasn't meant to be. I should have included some
humor
> to break it up a little. Did you hear the one about the guy that walked
into
> the bar? He hurt himself!!
> Suds
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