Does anyone know any the procedure a copolymer molecular weight is about 200,000.
Acrylicamid/acrylic acid weight ratio is betwen (40/60, 50/50, 60/40, 70/30) in the polymer.
Hello dear it can be obtained by solution polymerization by using high initiator concentration.
I used high initiator concentration, but the polimer molecular weight sudenly increased.
Could you suggest me a procedure, article or patent
Dear Huseyin,
I have made good experience with using sodium formate as a chain-transfer agent for molecular weight control in aqueous solution polymerization of acrylamide [Macromol. Chem. Phys. 2007, 208, 1744–1752.] and N-isopropylacrylamide [Soft Matter 2010, 6, 3184–3190], inspired by the work of Fevola, Hester, and McCormick [J. Polym. Sci. A: Polym. Chem. 2003, 41, 560–568]. According to my memory, polymerization at a molar concentration of 0.25 mol/L should give a polymer with molar mass of around 200,000 g/mol if a molar concentration of sodium formate of 0.25 g/L is used as well (that is, an equimolar amount of the chain-transfer agent rel. to the monomer). I hope this information will be useful for your given case of copolymerization with acrylic acid.
Greetings to you,
Sebastian Seiffert
Polymerisation of acrylic acid and acrylamide is rather easy in solution. 200K dalton is a medium to high Mw so using a typical sodium persulfate / sodium bisulfite system should work just fine, in water with polymeriztion temperatures around 80 - 90°C. You should not need an additional transfer agent for such high Mw, Bisulfite in itself will play that role. Many old patent exist that describe the conditions and the amounts of initiator needed, look for old patents from Rohm and Haas.
Best Regards
Yves Kensicher
Thank you so much for your suggestions.
I will try your recommendation.
Firstly, I would like to thank you for all your contributions
I produced the polymer which molecular weight is around 200 000, now there is another problem.
How can I separate copolymer from homopolymers(polyacrylic acid and polyacrylamide)
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