[confusedstud]

In addition polymerization of alkenes, must the monomers be the same or can there be more than 1 different ones?

As for condensation polymerization, must there be two monomers or can there just be one? In my textbook it's quite vague so I'm not very sure about it. They state that they are made by 2 monomers. But what are the requirements for condensation? Can there just be 2 different functional groups at the end for 1 monomer or must there be 2 or more monomers with the same functional group at each ends of the same type of monomer?

Lastly, when I write out the general formula for the polymer eg (-C2H4-)n, will the empirical formula be CH2 or will it be CH3? Because at the two ends there will be hydrogens bonded as well right?

Thanks!

[Hunter2]

Question 1. Of course there are polymeres made of different monomers  also called Copolymers.

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

Question2. Of course the Polymere can be made with one type of monomer. Example all Aminoacids , proteine,   Perlon,  Polyester made from Hydroxycarbon acids HO-R-COOH, etc.

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

https://www.google.com/search?q=Perlon&hl=de&client=firefox-beta&hs=aPO&rls=org.mozilla:de:official&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=gyD0T9TfFafA0QXxi72oBw&ved=0CGgQsAQ&biw=1044&bih=810

[confusedstud]

Question 1. Of course there are polymeres made of different monomers  also called Copolymers.

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

Question2. Of course the Polymere can be made with one type of monomer. Example all Aminoacids , proteine,   Perlon,  Polyester made from Hydroxycarbon acids HO-R-COOH, etc.

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

https://www.google.com/search?q=Perlon&hl=de&client=firefox-beta&hs=aPO&rls=org.mozilla:de:official&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=gyD0T9TfFafA0QXxi72oBw&ved=0CGgQsAQ&biw=1044&bih=810

Hi for question 1 I'm referring to addition polymerisation of alkenes only. Can 2 different alkenes form a polymer eg ethene and propene undergoes addition to form one polymer?

For question 2 I'm referring to condensation polymerisation. What are the specific conditions for condensation? Must the just be 2 or more functional groups at the ends of the monomer? And the monomer can either be 1 or more?

Thanks!

[Hunter2]

Question 1 Yes

http://www.azom.com/article.aspx?ArticleID=408

Question 2 If you have a x Monomer A-R-B  you can make A-(R-R-R-R-R)_x-B + (x-1) AB

If you have A-R-A and B-R-B you can make the same A-(R-R-R-R-R)_x-B + (x-1) AB
You need two different functional groups or two diferent molecules with different functional groups

Compare Nylon and Perlon

[confusedstud]

Question 1 Yes

http://www.azom.com/article.aspx?ArticleID=408

Question 2 If you have a x Monomer A-R-B  you can make A-(R-R-R-R-R)_x-B + (x-1) AB

If you have A-R-A and B-R-B you can make the same A-(R-R-R-R-R)_x-B + (x-1) AB
You need two different functional groups or two diferent molecules with different functional groups

Compare Nylon and Perlon

Oh I understand now. But also if I have a general formula (-C2H4-)n what will the empirical formula be? Because at the end there should be 2 Hydrgen as well so I'm not sure if I should add that in.

Thanks!

[Hunter2]

No

Please check how polymers will be made

Normally you use a starter molecule. R-O-O-R or similar, which brakes to 2 R-O-

Check also end reaction, brake ups, recombination reaction, etc.

You will not find H- there.

Ziegler-Natta reaction and more

[confusedstud]

No

Please check how polymers will be made

Normally you use a starter molecule. R-O-O-R or similar, which brakes to 2 R-O-

Check also end reaction, brake ups, recombination reaction, etc.

You will not find H- there.

Ziegler-Natta reaction and more

hi Hunter2, do you know where i can find good resources on the internet about the empirical formulas of polymers? I can't seem to find any of them.

Thanks!

[Hunter2]

Polymers have a molar mass deviation depending on reaction conditions:

http://www.ias.ac.in/initiat/sci_ed/resources/chemistry/MolWeight.pdf

There no only one moarmass.