کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5191265 | 1381228 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and properties of polyimides from isomeric bis(dicarboxylphenylthio)diphenyl sulfone dianhydrides
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
4,4â²-Bis(3,4-dicarboxyphenylthio)diphenyl sulfone dianhydride(4,4â²-PTPSDA) and 4,4â²-bis(2,3-dicarboxyphenylthio)diphenyl sulfone dianhydride(3,3â²-PTPSDA) were synthesized from chlorophthalic anhydrides and bis(4-mercaptophenyl)sulfone. Their structures were determined via IR spectra, 1H NMR and elemental analysis. A series of polyimides were prepared from isomeric PTPSDAs and aromatic diamines in 1-methyl-2-pyrrolidinone (NMP) via the conventional two-step method. Polyimides based on 4,4â²-PTPSDA and 3,3â²-PTPSDA have good solubility in polar aprotic solvents and phenols. The 5% weight-loss temperatures of isomeric polyimides were near 500 °C in N2. DMTA and DSC analyses indicated that the glass-transition temperatures of polyimides from 3,3â²-PTPSDA are higher than those of polyimides from 4,4â²-PTPSDA. The wide-angle X-ray diffraction showed that all polyimides are amorphous. The polyimides from 3,3â²-PTPSDA showed higher permeability but lower permselectivity compared with those from 4,4â²-PTPSDA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 18, 23 August 2005, Pages 7678-7683
Journal: Polymer - Volume 46, Issue 18, 23 August 2005, Pages 7678-7683
نویسندگان
Jingling Yan, Zhen Wang, Lianxun Gao, Mengxian Ding,