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題 名 | Synthesis and Characterization of Polyamides and Poly (Amide-Imide)s Based on Ether-Sulfone-Diamines |
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作 者 | Hisao,Sheng-huei; Yang,Chin-ping; Li,Chin-tang; | 書刊名 | Journal of Polymer Research |
卷 期 | 5:4 1998.10[民87.10] |
頁 次 | 頁243-248 |
分類號 | 346.84 |
關鍵詞 | Polyamides; Poly (amide-imide)s; Ether-sulfone-diamines; Methyl substituent; Solubility; T s; |
語 文 | 英文(English) |
英文摘要 | A series of polyamides and poly (amide-imide)s were prepared by the direct polycon-densation of 4,4'-〔sulfonylbis(1,4-phenyleneoxy)〕dianiline or 4,4'-〔sulfonylbis (2,6-dimethyl-1,4-phenyleneoxy)〕dianiline with aromatic dicarboxylic acids and phthalimide unit-bearing dicarboxylic acids in a N- methy1-2- pyrrolidone (NMP) solution containing dissolved calcium chloride using triphenyl phosphite and pyridine as condensing agents. The inherent viscosities of the resulting polymers were above 0.45 dL/g and up to 1.70 dL/g. Except for the polyamides derived from terephthalic acid and 4,4'- biphenyldicarobxylic acid, all the other polyamides and all poly (amide-imide)s were readily soluble in polar organic solvents such as NMP, N,N- dimethylacetamide(DMAc), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and mcresol, and afforded transparent and tough films by solution-casting. Most of the polymers showed distinct glass transtition on their differential scanning calorimetry (DSC) traces and their glass transition temperatures (Tg) stayed between 140∼264℃. The methyl-substituted polymers showed higher Tgs than the corresponding unsubstituted counterparts. The results of the thermogravimetry analysis (TGA) revealed that all the methy-substituted polymers showed lower initial decomposition temperatures than the unsubstituted ones. |
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