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Topic: polymers  (Read 12468 times)

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Offline Dan

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Re: polymers
« Reply #15 on: February 22, 2007, 03:56:22 PM »
The bonds it that picture that are drawn like this: ___....___ between the repeating units should be solid bonds. Apart from that, fine.
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Offline iamthepolice

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Re: polymers
« Reply #16 on: February 23, 2007, 04:59:01 PM »
ahh thanks....

one more question, when you add benzoyl peroxide and methyl methacrylate what does it make?

can you briefly write the equation for me please..

Offline Borek

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Re: polymers
« Reply #17 on: February 23, 2007, 06:30:59 PM »
Take a look at the benzoyl peroxide structure. What happens is that the oxyngen-oxygen bond easily breaks and free radicals are generated. these free radicals attach themselves to the double bond carbon-carbon in your monomer starting chain reaction. Thus - assuming that initiator has formula A-A and your monomer is M what you will get is A-(M)n-A molecule.
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Offline iamthepolice

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Re: polymers
« Reply #18 on: February 24, 2007, 05:57:41 AM »
oky cool,

now i dont know which way to write this all down. because the question is asking: show using equations the reactions which occur?

does that mean i write it down in its structural form or the other way. (i dont know whats it called)

Offline Borek

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Re: polymers
« Reply #19 on: February 24, 2007, 06:09:43 AM »
There are three phases: inititaion, polymerization, ending. First one is two step (peroxide decomposition and attack on the first monomer). You should be able to write all reactions now.
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Offline iamthepolice

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Re: polymers
« Reply #20 on: February 24, 2007, 10:14:37 AM »
ohh i see, ive got an idea now:

so like the 1st step is initiation
2nd propagation
3rd termination

are these the three steps?

Offline Borek

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Re: polymers
« Reply #21 on: February 24, 2007, 12:59:16 PM »
Yes. Don't bother with my nomenclature :)
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Offline iamthepolice

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Re: polymers
« Reply #22 on: February 24, 2007, 03:29:45 PM »
oky, thanks 4 ya help..

ive got another question....

Q- give 2 reasons why suspension polymerisation is used instead of bulk polymerisation?

ive looked in the book that ive got, but its not in there...

Offline DrCMS

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Re: polymers
« Reply #23 on: February 26, 2007, 10:13:45 AM »
Think about the heat of reaction and what might happen.

Offline iamthepolice

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Re: polymers
« Reply #24 on: February 26, 2007, 06:01:34 PM »
erm will it get extremely hot?

i was thinking in the lines of it being:

-cheaper
-environmentally friendly
-more active sites available therefore the reagent made more efficiently due to it increasing the rate of reaction....

i duno if thats correct...

Offline Borek

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Re: polymers
« Reply #25 on: February 26, 2007, 06:35:31 PM »
Is reaction kinetic temperature dependent?
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