Unraveling the Molecular Weight Dependence of Interfacial Interactions in Poly(2-vinylpyridine)/Silica Nanocomposites.

Autor: Voylov DN; Department of Chemistry and ‡Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and ∥Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Holt AP; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Doughty B; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Bocharova V; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Meyer HM 3rd; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Cheng S; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Martin H; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Dadmun M; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Kisliuk A; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States., Sokolov AP; Department of Chemistry and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37916-1600, United States.; Chemical Sciences Division and Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States.
Jazyk: angličtina
Zdroj: ACS macro letters [ACS Macro Lett] 2017 Feb 21; Vol. 6 (2), pp. 68-72. Date of Electronic Publication: 2017 Jan 10.
DOI: 10.1021/acsmacrolett.6b00915
Abstrakt: The structure and polymer-nanoparticle interactions among physically adsorbed poly(2-vinylpyridine) chains on the surface of silica nanoparticles (NPs) were systematically studied as a function of molecular weight (MW) by sum frequency generation (SFG) and X-ray photoelectron (XPS) spectroscopies. Analysis of XPS data identified hydrogen bonds between the polymer and NPs, while SFG evaluated the change in the number of free OH sites on the NP's surface. Our data revealed that the hydrogen bonds and amount of the free -OH sites have a significant dependence on the polymer's MW. These results provide clear experimental evidence that the interaction of physically adsorbed chains with nanoparticles is strongly MW dependent and aids in unraveling the microscopic mechanism responsible for the strong MW dependence of dynamics of the interfacial layer in polymer nanocomposites.
Databáze: MEDLINE