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  • 1
    Electronic Resource
    Electronic Resource
    Rotational diffusion measurements of suspended colloidal particles using two-dimensional exchange nuclear magnetic resonance (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 509-520 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present here an experimental and theoretical study of the application of two-dimensional exchange nuclear magnetic resonance spectroscopy (NMR) to the investigation of the rotational diffusion of colloidal particles. The theoretical discussion includes the nature of the NMR frequency time-correlation function where the NMR interaction is represented by the chemical shift anisotropy (CSA). Time-correlation functions for the isotropic rotational diffusion of a suspension of colloidal particles containing single and multiple sites are derived in addition to time-correlation functions for the rotational diffusion of a suspension of symmetric top particles containing an isotropic distribution of a single CSA interaction. Simulations of two-dimensional exchange spectra for particles undergoing isotropic rotational diffusion are presented. We performed two-dimensional exchange NMR experiments on a colloidal suspension of spherical poly(methyl methacrylate) (PMMA) particles which were synthesized with a 20% enrichment in 13C at the carbonyl site. Rotational diffusion time-correlation functions determined from the experimental exchange spectra are consistent with the composition of the colloidal suspension. Detailed explanations of the syntheses of the enriched methyl 13C-(carbonyl)-methacrylate monomer and the small quantities of 20% enriched 13C-(carbonyl)-poly(methyl methacrylate) microspheres used for this study are presented. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470847
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  • 2
    Electronic Resource
    Electronic Resource
    On-line detection of emulsion polymerization by solid-state NMR spectroscopy (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 356-361 
    Details
    ISSN: 1435-1536
    Keywords: Key words Emulsion polymerization ; solid-state NMR spectroscopy ; on-line detection ; poly(butyl acrylate)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The on-line detection of emulsion polymerization processes by means of solid-state NMR spectroscopy is demonstrated for the first time using poly(butyl acrylate) as a model system. Relatively short time intervals are accessible via 1H detection while the use of 13C NMR spectroscopy results in an increased spectral resolution. Details of sample preparation and experimental techniques are given, while remaining artifacts of the preliminary results will be addressed in further investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050251
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  • 3
    Electronic Resource
    Electronic Resource
    Different types of water in the film formation process of latex dispersions as detected by solid-state nuclear magnetic resonance spectroscopy (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 236-244 
    Details
    ISSN: 1435-1536
    Keywords: Key words Latex dispersions ; Film formation ; 1H and 2H solid-state nuclear magnetic resonance ; Water in polymer films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The properties of polymer films prepared from latex dispersions are influenced by the drying or film formation process. In order to investigate this process, various systems of aqueous latex dispersions were dried until a specific solid content was reached. The samples investigated were based on vinyl acetate, vinyl acetate/ethylene and pure acrylics employing different surfactants and polyelectrolytes as stabilisers of the dispersions. The role of water in these partially dried films was investigated using 1H and 2H solid-state NMR spectroscopy. Different types of water could be distinguished in the spectra. The drying latex films were found to contain interfacial external water, water at ionic and nonionic groups at surfactants in the polymer/water interface and also water inside the swollen polymer. These different types of water were examined separately using various NMR techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050037
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    Paper (German National Licenses)
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