Annealing Polycarbonate
Annealing Polycarbonate
(OP)
My question is in relation to annealing. Would excessive annealing cause degradation provide the temperature is kept 30C below the glass transition temperature Tg?
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RE: Annealing Polycarbonate
You can get hydrolysis when heated in the presence of water.
You can get oxidation when heated in the presence of air.
Regards
Pat
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RE: Annealing Polycarbonate
RE: Annealing Polycarbonate
page 538, Chapter 20, Polycarbonates:
"In general, moulding strain will be reduced by using high melt temperatures, preplasticing machines, high injection rates, hot moulds (around 100C) and, where used, inserts should be hot. Annealing at up to 125C for up to 24 hrs will be of some value."
Cheers
Harry
RE: Annealing Polycarbonate
RE: Annealing Polycarbonate
Hi Demon3,
Indeed. I though it a rather odd question so looked it up the old fashioned way!
Brydson was Head of Department at the (as was) North London polytechnic when my wife did her whatever it was there a few years ago (must have been late 70's.) Crap lecturer apparently... Haven't bothered with a later version as they're all the same as far as I can make out!
Harry
RE: Annealing Polycarbonate
My answer on how to do it once would have been read the manufacturers literature. I know both GE and Bayer had good literature on this. I can't be bothered checking their current names as a simple google search by the OP would have answered that question.
By the way I agree completely with both Demon3 and Puds answers.
Regards
Pat
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RE: Annealing Polycarbonate
Hey Pat,
You're right! A "proper" read after your comment makes the post have a very different perspective on the question!
I bet you're great on conspiracy theories! (joke) Or are you just a cynic? Strange application if so - perhaps the op might like to elucidate on the application?
(Deafening silence ensues...)
Cheers
Harry
RE: Annealing Polycarbonate
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers for professional engineers