Intermolecular interactions of polyimides containing benzimidazole and benzoxazole moieties

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 biphenyltetra...

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Bibliographic Details
Published in:Polymer (Guilford) 2013-04, Vol.54 (9), p.2335-2340
Main Authors: Song, Guangliang, Zhang, Yu, Wang, Daming, Chen, Chunhai, Zhou, Hongwei, Zhao, Xiaogang, Dang, Guodong
Format: Article
Language:English
Subjects:
Applied sciences
benzimidazole
Exact sciences and technology
glass transition
Hydrogen bonding
impedance
Intermolecular interaction
isomers
Organic polymers
Physicochemistry of polymers
Polyimides
polymers
Properties and characterization
spectroscopy
Structure, morphology and analysis
temperature
thermal analysis
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Summary: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. [Display omitted]
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2013.02.051