Dissertation > Excellent graduate degree dissertation topics show

Study on HPLC Stationary Phase of PAH/Derivatives of PEMA Multilayers

Author: WangNanNan
Tutor: JiangXiuMing
School: Henan University of Technology
Course: Analytical Chemistry
Keywords: Layer-by-layer self assembly poly(ethylene-alt-maleic anhydride) phenylethylamine derivative of poly(ethylene-alt-maleic acid) phenylalanine derivative ofpoly(ethylene-alt-maleic acid) high-performance liquid chromatography stationary phase
CLC: O657.7
Type: Master's thesis
Year: 2012
Downloads: 26
Quote: 0
Read: Download Dissertation

Abstract


A phenylethylamine derivative (PEMAPEA) and a phenylalanine derivative (PEMAPHE)of poly (ethylene-alt-maleic acid) were synthesized from poly (ethylene-alt-maleic anhydride)and were characterized with FT-IR,1H NMR. The poly(allylamine hydrochloride)(PAH)/PEMAPEA multilayer was fabricated on the quartz slide by using the layer-by-layertechinque and the growth of the multilayer was monitored with a UV-Vis spectrophotometry.Influences of the concentration of polyelectrolytes and the concentration of NaCl added in thepolyelectrolyte solutions were studied. The results show the absorbance of thePAH/PEMAPEA multilayer increasing regularly with the number of the bilayers. At low(<0.4mmol·L-1) or high (4.0>mmol·L-1) polyelectrolyte concentration the films grow slowlyand linearly with the number of deposition cycles. When the polyelectrolyte concentration isin the range of0.4to4.0mmol·L-1, the multilayers grow rapidly and linearly after the initialnonlinear deposition stages. The growth rate of the multilayers increase with theconcentration of NaCl added in PAH solution. But the deposition amounts of the films hardlyvary as the NaCl concentration added in PEMAPEA solution increasing when the NaCladded in the PAHsolution is constant. These indicate the addition of NaCl in polymer solutionchanges only the deposition of PAH on the surface of PAH/PEMAPEA multilayer film.The PAH/PEMAPEA multilayer film was fabricated on the surface of porous sphericalsilica gel by using the layer-by-layer technique to build high performance liquidchromatography stationary phase. Infrared spectroscopy and Elemental analyses resultsconfirmed the existence of the organic polymer on the silica gel surface. Under reversedphase conditions, the chromatographic performance and retention mechanism of thePAH/PEMAPEA multilayer film stationary phase were evaluated by using different soluteincluding aromatic compounds, carbamate pesticides, organophosphorus pesticides andorganochlorine pesticide. When the alkyl chain of alkylbenzene was longer or the number ofpolycyclic aromatic hydrocarbons’aromatic ring increased, the analyte retention values wereincreased on multilayer film stationary phase, in addition, when the polarity of mobile phaseincreased, the capacity factor of analyte increased, which showed that hydrophobic and π-π interactions were existing between the PAH/PEMAPEA multilayer film stationary phase andanalytes.The PAH/PEMAPHE multilayer film stationary phase was fabricated on the surface ofporous spherical silica gel by using the layer-by-layer technique. Under reversed phaseconditions, the chromatographic performance and retention mechanism of the stationaryphase were evaluated by using different analysisc including aromatic compounds, anilines,organophosphorus pesticides, carbamate pesticides, and benzene drugs, and the resultindicated that there were hydrophobic and π-π interaction between the PAH/PEMAPHEmultilayer film stationary phase and analysis including, which was similar to thePAH/PEMAPEA multilayer film stationary phase.

Related Dissertations

  1. Fabrication and Property of Films Based on Polyoxometalates and Dyes,O611.3
  2. The Preparation and Performance of Funcational Materials Based on Polymer,TB34
  3. Fabrication and Characterization of Nano-scare TiO2/PE Multilayers,TB383.1
  4. Layer-By-Layer Assembly and Property Studies on Ultrathin Films of LDH/Protein and LDH/Europium(Ⅲ)-Containing Polyoxometalate,TB383.2
  5. Preparation of Molecularly Imprinted Polymers and Application in Pharmaceutical Detection,R927.2
  6. Study on the Preparation and Properties of Layer-By-Layer Self-Assembled LDHs/Polyelectrolyte Composite Films,TB383.2
  7. Poly(dimethylsiloxane) Elastomeric Microspheres: Controllable Synthesis and Surface Winkling,TB383.4
  8. Using the layer by layer self-assembly of new functional ultra- thin films and surface modification,TB383.2
  9. Preparation and Application of Novel Ultrasound Contrast Agents,R445.1
  10. Research and analysis of application of the graphite electrode surface fixed ferricyanide,O646.54
  11. Layer-by-layer Assembled Chiral Polyelectrollyte Multilayer Films,O631.3
  12. Construction of Free-standing Film with Double Network Structure by Layer-by-layer Self Assembly,TB383.2
  13. Preparation of TiO2 Nanorods Array on Ti Substrate and the Study of Morphology of Osteoblasts Adhered on Different Nanostructured TiO2 Surfaces,TB383.1
  14. Sduties on the Modification of Elastin via Layer-By-Layer Self-Assembly,Q51
  15. Pilot Study on a Novel Formulation for Controlled Insulin Release,R944
  16. Preparation of Water-Soluble CdSe and CdTe Quantum Dots and Their Film Deposition,O614.242
  17. Preparation and Protection of Magnetic Polymer Microspheres with Fluorescence,TB324
  18. Preparation of self-assembled layers of manganese oxide / graphite oxide thin film materials,TB383.1
  19. Interfacial Interaction and Properties of Multi-walled Carbon Nanotubes/Polyvinyl Alcohol Membranes,TB383.1
  20. Fabrication and Characterization of NaCS/Chitosan Layer-by-Layer Self Assembly Complex Membrane & Microcapsules,TB383.2
  21. Selective Adsorption and Separation of Protein by Chitosan and Its Derivative,Q51

CLC: > Mathematical sciences and chemical > Chemistry > Analytical Chemistry > Instrument analysis ( physics and physical chemistry ) > Chromatographic analysis
© 2012 www.DissertationTopic.Net  Mobile