کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5181746 1380970 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intermolecular interactions of polyimides containing benzimidazole and benzoxazole moieties
ترجمه فارسی عنوان
تعاملات بین مولکولی پلی آمید ها حاوی بنزیمیدازول و بنزوکسازول
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

Thermal analysis and infrared spectroscopic studies were performed to investigate the strength of intermolecular interactions of the polyimides derived from 5,4′-diamino-2-phenyl benzimidazole (DAPBI) and 5,4′-diamino-2-phenyl benzoxazole (DAPBO). Polyimide films were prepared based on biphenyltetracarboxylic dianhydride (BPDA) isomers, difference of glass transition temperatures (ΔTg) between DAPBI and DAPBO type polyimides decreased consistently as the steric impedance increased, implying that polyimides containing benzimidazole group had higher degree of intermolecular interactions. Infrared spectra of polyimide films displayed that the imide carbonyl (CO) stretching band for DAPBI derived polyimides shifted to lower frequency compared to the DAPBO counterpart. In the IR spectra of the copolyimides based on DAPBI and DAPBO, significant red shift was observed for CO stretching band and Tg increased as a function of DAPBI content. This suggests the presence of strong intermolecular interactions due to the hydrogen bonding for the DAPBI based polyimides.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 54, Issue 9, 19 April 2013, Pages 2335-2340
نویسندگان
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