alinazubairx
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hi, q's on polymerisation of alkenes-
would a high temp and high pressure result on a high yield of polymer? if so why?
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Tolgash
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This sounds like a question that involves equilibrium. Does it?
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alinazubairx
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(Original post by Tolgarda)
This sounds like a question that involves equilibrium. Does it?
nope. just addition polymerisation.
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Tolgash
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(Original post by alinazubairx)
nope. just addition polymerisation.
Well, if my memory serves me correctly, logic would dictate that a high temperature and high pressure would increase the rate of reaction, thereby producing a greater yield. So, yes, an addition reaction would have a higher yield with those conditions.

However, just in case I am wrong (which wouldn't surprise me, if I'm being honest), I'll tag the experts: Pigster and MexicanKeith.
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Pigster
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(Original post by Tolgarda)
Well, if my memory serves me correctly, logic would dictate that a high temperature and high pressure would increase the rate of reaction, thereby producing a greater yield. So, yes, an addition reaction would have a higher yield with those conditions.

However, just in case I am wrong (which wouldn't surprise me, if I'm being honest), I'll tag the experts: Pigster and MexicanKeith.
me = expert - you iz havin a jeraaaarf

Polymers aren't my forte, but two thoughts - all reactions are equilibria, so inc. P will help yield, inc. T will hinder (I don't know of any equilibrium where inc. both T and P inc. yield). The other would be a delta G based thought - DS is very -ve (for addition polymerisation), so there will be a maximum feasible T, but this also means that as we approach DG = 0, then the yield will be affected (which confirms my thought that inc. T would hinder).

Inc. T and P will only increase yield (as you suggest) if you don't allow the reaction to go to completion i.e. you stop the reaction early, e.g. you don't allow it to reach dynamic equilibrium / allow one reagent to be used up.

But, a proper chemist might come along soon. If we're lucky.
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Tolgash
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(Original post by Pigster)
me = expert - you iz havin a jeraaaarf

Polymers aren't my forte, but two thoughts - all reactions are equilibria, so inc. P will help yield, inc. T will hinder (I don't know of any equilibrium where inc. both T and P inc. yield). The other would be a delta G based thought - DS is very -ve (for addition polymerisation), so there will be a maximum feasible T, but this also means that as we approach DG = 0, then the yield will be affected (which confirms my thought that inc. T would hinder).

Inc. T and P will only increase yield (as you suggest) if you don't allow the reaction to go to completion i.e. you stop the reaction early, e.g. you don't allow it to reach dynamic equilibrium / allow one reagent to be used up.

But, a proper chemist might come along soon. If we're lucky.
Thanks for educating me here haha.
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alinazubairx
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(Original post by Tolgarda)
Well, if my memory serves me correctly, logic would dictate that a high temperature and high pressure would increase the rate of reaction, thereby producing a greater yield. So, yes, an addition reaction would have a higher yield with those conditions.

However, just in case I am wrong (which wouldn't surprise me, if I'm being honest), I'll tag the experts: Pigster and MexicanKeith.
thank you very much!
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alinazubairx
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(Original post by Pigster)
me = expert - you iz havin a jeraaaarf

Polymers aren't my forte, but two thoughts - all reactions are equilibria, so inc. P will help yield, inc. T will hinder (I don't know of any equilibrium where inc. both T and P inc. yield). The other would be a delta G based thought - DS is very -ve (for addition polymerisation), so there will be a maximum feasible T, but this also means that as we approach DG = 0, then the yield will be affected (which confirms my thought that inc. T would hinder).

Inc. T and P will only increase yield (as you suggest) if you don't allow the reaction to go to completion i.e. you stop the reaction early, e.g. you don't allow it to reach dynamic equilibrium / allow one reagent to be used up.

But, a proper chemist might come along soon. If we're lucky.
thank you!
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