Re: [PSUBS-MAILIST] PSUB Fatalities...View Ports...Shatterproof

["Paul Suds" <paul_suds@hotmail.com>]

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
______________________________________________________
Get Your Private, Free Email at http://www.hotmail.com