| Summary: | 碩士 === 中原大學 === 化學研究所 === 103 === STOBA (self-terminated oligomers with hyper-branched architecture) is a smart functional polymer, one of its use is as an additive safety of lithium-ion battery to avoid thermal explosion.
We use multi- nuclide and multi-dimensional NMR pulse sequences, sequential do NMR study of the following topics: (i) labeling and assigning the raw material of STOBA: BMI2300, the derivatives of BMI1000 (4,4''-Bismaleimidodi-phenylmethane), BTA (Barbituric Acid) and solvent NMP (N-Methyl-2-pyrrolidone) to confirm the purity of reactants and analysis quantitatively during the reaction.(ii) using the one-dimensional 1H NMR spectrum of each raw material at 130 ºC self-reaction, and based on its integral ratio to quantitative calculation in the polymerization reaction of self-reactive reactant consumption situation and qualitative confirm the location of the reactants active group.(iii) surmising the possible reaction mechanism and the bonding of reactants in STOBA synthesis reaction in chemical kinetics in order to surmise STOBA molecular structure and the safety mechanism actuation behavior when STOBA as an additive safety of lithium-ion battery.
According to NMR and SAXS, SEM, GPC supplemented, we confirmed that STOBA synthesis of the main reaction mechanism consists of two kinds: Michael addition reaction and homopolymerization radical reaction.Two reaction mechanisms competing under different reaction temperature. With the evolution of time, the product will be sequentially from the oligomers, the primary structure, and then gathered into a practical STOBA spherical-like dendrimer secondary structure.
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