NMR Study on the Synthesis and Optimization of BTA and BMI in Solvent DMF
| Autor: | Shan-Yuan Yang, 楊善淵 |
|---|---|
| Rok vydání: | 2012 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 100 Nuclear magnetic resonance technology can confirm the thermodynamics molecular structure of the sample by chemical shift, J-coupling, quantitative integration, and diffusion coefficient. Liquid nuclear magnetic resonance has following characteristics: high resolution( 1 cm-1 equals to 3*1010 Hz in resolution,) mixture compounds identification( by using COSY or Diffusion coefficient experiments,) simultaneous qualitative and quantitative analysis, and diversified pulse sequence( 1D and 2D homonuclear and 2D heteronuclear pluse sequence.) Therefore, NMR is important to the molecular-level identification. Beside the identification of the molecular structures, NMR can be used in dynamic study of possible reaction mechanisms by analyzing the spectrums of reactant active sites and structures of products. In this study, we proposed possible mechanisms of the polymerization in which BMI( 4,4'-Bismaleimidodi-phenylmethane) reacted with BTA ( Barbituric acid) at 90°C in DMF( N,N-Dimethylformamide) solvent system. The polymerization reaction of the structural identification, by changing the different (a) magnetic field, (b) temperature of the NMR experiments, (c) the proportion of reactants, (d) the product of dynamics, in order to parse out the products structures. Traditionally, polymer chemists focus on the behaviors and utility functions of polymers, which does not have deep discussion to its molecular structure. In this paper we identified the structures of BMI-BTA polymer by mainly NMR technology and some complementary measurements. It is our wish to improve reaction efficiency, to fine tune the modification of BMI-BTA polymer in the future and hopefully applied this technique to different domains. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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