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Author: Subject: Plastics
chrisg

posted on 21/11/08 at 07:58 PM Reply With Quote
Plastics

Whats the name given to plastics that melt when heated but return to their former state when cooled?

And an example type would be nice

Thanks

Chris





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clairetoo

posted on 21/11/08 at 08:04 PM Reply With Quote
Thermoplastic's
Dunno what your looking for by way of an example though





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Peteff

posted on 21/11/08 at 08:06 PM Reply With Quote
I hate it when we get homework





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blakep82

posted on 21/11/08 at 08:10 PM Reply With Quote
perspex is a plastic which melts when heated but only to the point where its bendy and stuff, but it can only be heated once from what i remember at school





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blakep82

posted on 21/11/08 at 08:10 PM Reply With Quote
perspex is a plastic which melts when heated but only to the point where its bendy and stuff, but it can only be heated once from what i remember at school

http://en.wikipedia.org/wiki/Thermoplastic





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IDONTBELEIVEIT

posted on 21/11/08 at 08:11 PM Reply With Quote
These Bad Boy's





Are We There Yet, Are We There Yet!!!!

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chrisg

posted on 21/11/08 at 08:15 PM Reply With Quote
After my extensive research (on google) thermoplastics are set by heat but don't then melt again.

Ffrench, see me at break

Cheers

Chris





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chrisg

posted on 21/11/08 at 08:15 PM Reply With Quote
oops double post!

[Edited on 21/11/08 by chrisg]





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Volvorsport

posted on 21/11/08 at 08:15 PM Reply With Quote
thermoplastic

polypropylene , ABS , Polycarbonate , PVC , can all be melted then formed into shapes and then set when cooled - if your asking for something thats got a memory after all that has happened , please give it to me - i wouldnt mind winning the nobel peace prize for science





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getting dirty under a bus

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Bigheppy

posted on 21/11/08 at 08:23 PM Reply With Quote
My credit card
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chrisg

posted on 21/11/08 at 08:24 PM Reply With Quote
So nothing exists that can be melted, made into, say, a cup and then re-melted and made into a saucer?

Interesting

Cheers

Chris





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Hellfire

posted on 21/11/08 at 08:34 PM Reply With Quote
What about this stuff? Is it something like this you're after?

Phil






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chrisg

posted on 21/11/08 at 08:43 PM Reply With Quote
That's interesting Phil, I could with finding out the chemical name is.

Thanks All

Cheers

Chris





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blakep82

posted on 21/11/08 at 08:43 PM Reply With Quote
so basically you're after a plastic with the properties of wax, for example?





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chrisg

posted on 21/11/08 at 08:48 PM Reply With Quote
yes

In a word.

Cheers

Chris





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wicket

posted on 21/11/08 at 08:51 PM Reply With Quote
Thermoplastics, eg ABS (Acrylonitrile butadiene styrene), can be ground up and reused to make other item.

The difference between thermoplastics and thermosetting plastics is that thermoplastics become soft, remoldable and weldable when heat is added. Thermosetting plastics however, when heated, will chemically decompose, so they can not be welded or remolded. On the other hand, once a thermosetting is cured it tends to be stronger than a thermoplastic.

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Hellfire

posted on 21/11/08 at 08:51 PM Reply With Quote
Some more info

Phil






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Alan B

posted on 21/11/08 at 08:57 PM Reply With Quote
AFAIK thermoplastics can be melted and re-melted although there is some loss of properties.

Thermosetting plastics can not be re-melted.

Could be wrong of course.

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chrisg

posted on 21/11/08 at 09:16 PM Reply With Quote
Thanks for that chaps, at last I'm getting somewhere, this place is the best!

I'll email those companies, see if that stuff is suitable for what I want.

Cheers

Chris





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blakep82

posted on 21/11/08 at 09:31 PM Reply With Quote
what do you actually want it for?





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chrisg

posted on 21/11/08 at 09:36 PM Reply With Quote
I could tell you, but I'd have to kill you!

It's for a recycling project, a study into using more re usable products in car body panels.

Cheers

Chris





Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!

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blakep82

posted on 21/11/08 at 09:43 PM Reply With Quote
does that mean i have to be killed now?
i didn't even get the choice!





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chrisg

posted on 21/11/08 at 09:46 PM Reply With Quote
Nah, you're safe enough.

(foir now)

Cheers

Chris





Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!

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BenB

posted on 21/11/08 at 09:46 PM Reply With Quote
I thought it was thermoplastics (like yoghurt pots)....
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Richard Quinn

posted on 21/11/08 at 09:59 PM Reply With Quote
quote:
Originally posted by chrisg
I could tell you, but I'd have to kill you!

It's for a recycling project, a study into using more re usable products in car body panels.

Cheers

Chris
Would you have to park in the shade in the summer (assuming we have one!)

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