title: Radical Chain Polymerization Catalyzed by Graphene Oxide and Cooperative Hydrogen Bonding.
abstract: Graphene oxide (GO) is effective in catalyzing a wide variety of organic reactions and a few types of polymerization reactions. No radical chain polymerizations catalyzed by GO have been reported. In this article, we probe the catalytic role and acceleration effect of GO for self-initiated radical chain polymerizations of acrylic acid (AA) in the presence of GO and a pre-existing polymer, poly(N-vinylpyrrolidone) (PVP), from a calorimetric perspective. Gelation experiments and DSC studies show that GO can function as a catalyst to accelerate the radical chain polymerization of AA. Isothermal polymerization kinetic data shows that the addition of GO diminishes the induction periods and increases the polymerization rates, as indicated by the much enhanced overall kinetic rate constants and lowered activation energies. The catalytic effect of GO for the polymerization of AA is attributed to the acidity of GO and the hydrogen bonding interactions between GO and monomer molecules and/or polymers.
authors.affiliation: College of Chemistry, Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University, Beijing, 100875, P. R. China.
authors.forename: Zhongcheng
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: College of Chemistry, Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University, Beijing, 100875, P. R. China.
authors.forename: Shengjie
authors.initials: S
authors.lastname: Shi
authors.affiliation: College of Chemistry, Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University, Beijing, 100875, P. R. China.
authors.forename: Huiliang
authors.initials: H
authors.lastname: Wang
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D000180:Acrylic Resins / Q000138:chemical synthesis*; D002384:Catalysis; D005609:Free Radicals / Q000737:chemistry; D005782:Gels; D006108:Graphite / Q000737:chemistry*; D006860:Hydrogen Bonding; D007700:Kinetics; D010087:Oxides; D058105:Polymerization; D011205:Povidone / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics
chemical_list: D000179:Acrylates; D000180:Acrylic Resins; D005609:Free Radicals; D005782:Gels; D010087:Oxides; C006903:carbopol 940; D006108:Graphite; D011205:Povidone; C036658:acrylic acid
keywords: acrylic acid; free radical polymerization; graphene oxide