Dear Virginie Dujols I don't know about the synthesis, but it what you're describing is poly(methacrylic acid). propylene: H2C=CH-CH3 --> PP: [-H2C-CH(CH3)-]n acrylic acid: H2C=CHCOOH --> PAA: [-H2C-CH(COOH)-]n methacrylate: H2C=C(CH3)COOCH3 --> PMMA: [-H2C-C(CH3)(COOCH3)-]n methacrylic acid: H2C=C(CH3)COOH --> PMAA: [-H2C-C(CH3)COOH)-]n Both the poly(acrylic acid) and the poly(methacrylic acid) have dangling COOH groups and are sold by Aldrich. The former is sold as a solid in various molecular weights and in aqueous solution (with a choice of acid, sodium, and potassium forms); the latter is sold as an aqueous sodium salt solution. Regards, Chris On Wednesday, August 28, 2002, at 06:53 am, Virginie Dujols wrote: > I need to either make -or buy- a PP film with its methyl groups being > converted into COOH groups. Maybe that would be a PMMA film? I am not > very > familiar with polymers! I am an organic chemist and can do traditional > organic chemistry. -- Christopher F. Blanford Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK Phone: (44)/(0)-1865-282603; Fax: (44)/(0)-1865-272690 PGP keyID: 8D830BC9 http://pgp.mit.edu/