کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5191111 | 1381225 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ortho alkyl substituents effect on solubility and thermal properties of fluorenyl cardo polyimides
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Ortho alkyl substituents effect on solubility and thermal properties of fluorenyl cardo polyimides Ortho alkyl substituents effect on solubility and thermal properties of fluorenyl cardo polyimides](/preview/png/5191111.png)
چکیده انگلیسی
Five fluorenyl cardo diamines containing different alkyl substituents were synthesized and characterized. A series of fluorenyl cardo polyimides were prepared by polycondensation of these cardo diamines with 4,4â²-oxydiphthalic anhydride (ODPA), 3,3â²,4,4â²-benzophenonetetracarboxylic dianhydride (BTDA), 3,3â²,4,4â²-biphenyl tetracarboylic dianhydride (BPDA) and pyromellitic dianhydride (PMDA). Most of fluorenyl cardo polyimides exhibited excellent solubility in common organic solvents such as m-cresol, chloroform, tetrahydrofuran (THF), N-methyl-2-pyrrolidinone (NMP), N,N-dimethylacetamide (DMAC) etc. and intrinsic viscosity in N,N-dimethylacetamide (DMAC) ranged from 0.31 to 0.92Â dl/g. Tg of polyimides based on ODPA decrease with the number and size of alkyl substituents on fluorenyl cardo diamine. The results show that the incorporation of noncoplanar structure led by the introducing alkyl substituents on fluorenyl cardo diamines improves the solubility of cardo polyimides in organic solvents without sacrificing thermal properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 14, 27 June 2005, Pages 5278-5283
Journal: Polymer - Volume 46, Issue 14, 27 June 2005, Pages 5278-5283
نویسندگان
Zhiqiang Hu, Minghai Wang, Shanjun Li, Xiaoyun Liu, Jianhua Wu,