| Summary: | 碩士 === 國立交通大學 === 應用化學系 === 87 === Nucleophilic aromatic substitution polymerization of type monomers 4-[2-(4-Flourophenyl)-5-(4-hydroxyphenyl)-1,3-oxazol-4-yl]phenol and 3-[2-(4-fluorophenyl)-4-(3-hydroxyphenyl)-1,3-oxazol-5-yl]phenol,using K2CO3 as reagent and DMPU(1,3-Dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone) as solvent yielded hyperhranched(aryl ether oxazole)s PAEO(Ⅰ) and PAEO(Ⅱ),respectively. The reactivity of two aryl fluoride mononers used in nucleophilic aromatic substitution polymerization was explored utilizing 19F-NMR experiments. The 19F shifts reflect the reactivity of the individual monomers examined. The hyperbranched marcomolecules contain a large number of chain end function groups, and the physical properties of the polymers such as thermal property and solubility depend on the nature of the chain ends. The degree of branching of PAEO(Ⅰ) was determined with the help of model compounds using 1H-NMR and was found to be near 52% ,similar to what has been observed in other hyperbranched polymer systems.
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