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Topic: polymers  (Read 12469 times)

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Offline iamthepolice

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polymers
« on: February 21, 2007, 09:20:30 AM »
im stuck! i need help. i really dont understand how to answer this question?  well firstly i did an experiment about a polymerization of methyl methacrylate.
i'll just quickly show what i carried out:
1. i got polyvinly alcohol dissolved it in water and heated it, its under reflux
2. dissolved benzoyl peroxide in a monomer (methyl methacryalte)
3. added it to the polyvinyl alcohol drop by drop.
4. then once it was heated for some time i took it all out an placed it into a beaker
5. filtered the solution using a buchner funnel and dryed it.

for the result i should have got some yellowy spherical entities..  but i didnt.

now for the questions...grrrr

i dont know how to do the equations for the reaction which occurs in this experiment.
please help

Offline iamthepolice

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Re: polymers
« Reply #1 on: February 21, 2007, 06:48:11 PM »
omg i thought this is a chemistry help forum!  :-[
i honestly need help i dont know how to do chemical equations.
at least start me off and point me in the correct direction..

Offline Mitch

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Re: polymers
« Reply #2 on: February 21, 2007, 04:37:13 PM »
You have yet to ask a question.

This is a Chemistry Help Forum, but you can't expect us to be here all the time. If you have something due right away, it is your own responsibility to of started it earlier.
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1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
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Offline iamthepolice

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Re: polymers
« Reply #3 on: February 22, 2007, 10:39:49 AM »
lol its not in till 2 weeks...

i understand that you wont be here all the time, but im just asking for help...
the question is:
show using equations the reactions which occur?

now i really dont know where and how to start....

Offline Borek

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Re: polymers
« Reply #4 on: February 22, 2007, 10:56:31 AM »
Somehow I find it hard to believe that you were not told or pointed to to the necessary information.

What is your monomer?

What is polymerisation? What happens to monomer during polymerisation?

What role benzoyl peroxide plays?
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Offline iamthepolice

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Re: polymers
« Reply #5 on: February 22, 2007, 11:05:24 AM »
What is your monomer? = methyl methacrylate

What is polymerisation? = when polymer chains react with each other.. to be honest i dont know
What happens to monomer during polymerisation? = i really dont have a clue

What role benzoyl peroxide plays? the initiator...

Offline Borek

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Re: polymers
« Reply #6 on: February 22, 2007, 11:08:04 AM »
http://en.wikipedia.org/wiki/Polymerisation

Look at your monomer structure and think, how can it polymerise.
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Offline iamthepolice

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Re: polymers
« Reply #7 on: February 22, 2007, 11:17:07 AM »
well methyl methacrylate is a CC(=C)C(=O)OC is that how u write it?
 
how does it polymeralise...erm does it like attach it to benzoyl peroxide (C6H5CO)2O2
but how does it become as one?

Offline Borek

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Re: polymers
« Reply #8 on: February 22, 2007, 11:36:51 AM »
well methyl methacrylate is a CC(=C)C(=O)OC is that how u write it?

SMILES is one of the notations, I am asking about the structure. It should look similar to the strcutures shown in wikipedia article about polymerization. Draw all atoms and all bonds. As long as you have no idea how it looks alike you have no chances of understanding what is going on.
 
Quote
how does it polymeralise...erm does it like attach it to benzoyl peroxide (C6H5CO)2O2
but how does it become as one?

Looks like you have no idea what polymerization is. Look at the first picture in wikipedia article. Do you see what happens to the monomers? Look slightly below at picture signed Fig. 1 - do you see what is hapening? Now try to imagine what will happen to your monomer during polymerization. Don't bother with initiator for now.
« Last Edit: February 22, 2007, 12:22:34 PM by Borek »
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Offline iamthepolice

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Re: polymers
« Reply #9 on: February 22, 2007, 11:54:17 AM »
it breaks! the long chains break

Offline Borek

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Re: polymers
« Reply #10 on: February 22, 2007, 12:21:57 PM »
Quite the opposite.
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Offline iamthepolice

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Re: polymers
« Reply #11 on: February 22, 2007, 12:45:59 PM »
oky now im confussed, the chains join together but where? i just cant stick it anywhere lol...

so its:
benzoyl peroxide + methyl methacrylate = ??

Offline Borek

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Re: polymers
« Reply #12 on: February 22, 2007, 01:05:06 PM »
I told you - don't bother with initiator for now. Try to find out how your monomer and your polymer look alike, no matter what happens at the chain ends.
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Offline Dan

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Re: polymers
« Reply #13 on: February 22, 2007, 01:09:16 PM »
Here is an example, the polymerisation of styrene: http://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Styren.png/400px-Styren.png

As Borek has said, apply what happens in the polymerisation of styrene to that of methyl acrylate.
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Offline iamthepolice

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Re: polymers
« Reply #14 on: February 22, 2007, 03:21:19 PM »
oh i see....so does that mean it will look like this: ive put it on the attachments...hope it shows up

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