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- Title
Grafting of Chitosan with Styrene and Maleic Anhydride via Nitroxide-Mediated Radical Polymerization in Supercritical Carbon Dioxide.
- Authors
García‐Valdez, Omar; Ramírez‐Wong, Diana Guadalupe; Saldívar‐Guerra, Enrique; Luna‐Bárcenas, Gabriel
- Abstract
A novel synthesis route is used to produce chitosan-graft-poly(styrene-maleic anhydride)-OH-TEMPO (CTS-g-PSMA-T). A three-step reaction scheme is proposed: 1) bromine 4-OH-TEMPO oxoammonium salt is synthesized. 2) Hydroxyl-targeted groups in the CTS molecule are reacted with the synthesized salt in aqueous acid solution. A functionalization of 18.9% is achieved. 3) Graft copolymerization of styrene and maleic anhydride is done via NMRP by a unimolecular initiation system. The reaction is run in a dispersion in supercritical carbon dioxide (scCO2) in the presence of camphorsulfonic acid (CSA) to avoid autopolymerization. A modified CTS with a graft content of 68% in weight is obtained.
- Subjects
POLYMERIZATION; CHEMICAL reactions; CHITOSAN; STYRENE; MALEIC anhydride; NITROXIDES; ACID solutions
- Publication
Macromolecular Chemistry & Physics, 2013, Vol 214, Issue 12, p1396
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300014