頁籤選單縮合
題 名 | Alternate Poly (Amide-Imide)s Based on 1,4-and 1,3-Bis (4-Trimellitimido) Benzene and Their Mixtures |
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作 者 | Chen,Ruei-shin; Yang,Chin-ping; | 書刊名 | Journal of Polymer Research |
卷 期 | 5:4 1998.10[民87.10] |
頁 次 | 頁233-241 |
分類號 | 346.84 |
關鍵詞 | Poly (amide-imide)s; p-Phenylenediamine; m-Phenylenediamine; Trimellitic anhydride; |
語 文 | 英文(English) |
英文摘要 | Several series of alternate poly(amide-imide)s〔P(A-alt-I)s〕were synthesized by aromatic dicarboxylic acid(I-p or I-m), which was prepared by the condensation of p-phenylenediamine (or m-phenylenediamine), trimellitic anhydride, and various aromatic diamines by means of direct polycondensation. A diimide-diacid (I-p) with a p-phenylene group was used to synthesize P(A-alt-I)s Ⅲ, and P(A-alt-I)s Ⅳ were synthesized by a diimide-diacid (I-m) prepared from m-phenylenediamine. Another series of P(A-alt-I)s Ⅴ was synthesized from both I-p and I-m (1/1 mole) with various diamines. Polymers of series Ⅲ have low inherent viscosities and limited solubility, but polymers of serier Ⅳ have high degrees of polymerization. Series Ⅴ copolycondensated from I-p and I-m has improved solubility and degrees of polymerization relative to series Ⅲ. The degree of crystallinity was found to be Ⅲ>Ⅴ>Ⅳ. Glass transition temperatures for most of series Ⅲ were not observed below 400℃, and those of series Ⅳ and Ⅴ were in the range of 238∼325℃ and 262∼328℃, respectively. The 10% weihgt loss temperatures in nitrogen or in air of these three series are all in the range of 482∼582℃. Because series Ⅴ has limited solubility for casting into films from DMAc solutions, two diamines were selected to synthesize series Ⅵ by changing the I-p/I-m ratio. Solubility was improved when the content of I-p in dimmide-diacid was less than 15%, and the degree of crystallinity reduced as the content of I-p in diimide-diacid decreased. Polymers containing a few I-p showed an increase in the initial modulus. |
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