| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 90 === Abstract
A series of polyimides containing pendent benzothiazole groups were synthesized from two new diamines. The diamines(3a,3b) were derived by a nucleophilic substitution of the bisphenol
(hydroquinone and 2-tert-butyl hydroquinone ) with 3-(2-benzothiazole)-4- chloronitrobenzene in presence of
K2CO3 and then were reduced. The diamines 3a and 3b were polymerized with aromatic dianhydrides in refluxing m-cresol containing isoquinoline to afford two new series of poly(ether-imide)s(7,8) with benzothiazole pendent groups. The poly(amic-acid)s had inherent viscosities of 0.7~0.88 dL/g. The soluble polyimides had inherent viscosities of 0.62~1.2 dL/g。The polyimide 8 containing pendent groups( tert-butyl and benzothiazole) showed good solubilities in common solvents such as 1-methy-2-pyrrolidinone(NMP), N,N-dimethylacetamide, chloroform, THF ,and Cyclehexanone. The polyimide 8a derived from pyromellitic dianhydride(PMDA) was even soluble in NMP. They can form tough and transparent films. The films have tensile strength of 82~133 Mpa, and elongaton to break of 4~34 %. Differential scanning calorimetry(DSC) and dynamic mechanical analysis(DMA) reveal their glass transition temperatures were found to be 279~343℃ and 294~352℃, respectively. Thermogravimetric analyses demonstrated that all polymers were stable up to 450℃, and the 10% mass loss temperatures were recorded in the range of 510~582℃ in nitrogen atmosphere.
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