| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 94 === Two new diamines containing pyridine heterocyclic group and bulky pendent substituent units was synthesized by chichibabin reaction and used in a preparation of poly(pyridine-imide)s by direct polycondensation with 4,4'-hexafluoroisopropylidenediphathalic anhydride (6FDA) in N-methyl-2-pyrrolidinone (NMP). The poly(pyridine-imide)s derived from two diamines with bulky pendent substituent were soluble in solvents including tetrahydrofuran(THF), N-methyl-2-pyrrolidinone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), γ-butyrolactone, pyridine, dimethylsulfoxide (DMSO) and cyclohexanone at room temperature or upon heating. These poly(pyridine-imide)s were fairly stable up to a temperature above 450 ℃ and lost 10% weight temperature higher than 520 ℃ in air. The poly(pyridine-imide)s could be cast into film from DMAc solution and was thermally converted into tough and flexible polyimide film. The poly(pyridine-imide)s film had a tensile strength above 90 MPa and a tensile modulus higher the 1.8 GPa. The poly(pyridine-imide)s showed a pair of reversible oxidation redox couples around -1.2 V vs Ag/AgCl in DMF solution. The optical properties exhibited the UV-vis absorption bands at the region of 200－400 nm and possessed strong fluorescent after protonated with acid.
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