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- Publisher
- Springer Journals
- Copyright
- Copyright © 2007 by Springer-Verlag
- Subject
- Chemistry; Polymer Sciences; Characterization and Evaluation of Materials; Soft Matter, Complex Fluids; Physical Chemistry
- ISSN
- 0170-0839
- eISSN
- 1436-2449
- DOI
- 10.1007/s00289-007-0818-1
- Publisher site
- See Article on Publisher Site
Abstract
Nanoscale blending of aromatic and aliphatic polyimides has been attempted by employing corresponding poly(amic acid) precursors in order to elucidate clues for achieving a semi-molecular composite film. Pyromellitic dianhydride (PMDA) and 4,4’-oxydianiline (ODA) were used to make the precursor polymer of aromatic polyimide (PMDA-ODA PI) as a semi-rigid rod-like component, whilst bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BOCA) and 4,4’-methylenebis(cyclohexylamine) (MCA) were used to prepare the precursor of aliphatic polyimide (BOCA-MCA PI) as a flexible coil-like component. The weight ratio of aromatic to aliphatic polyimides was varied from 100:0: to 0:100 by 10 wt % gap for monitoring the critical composition upon nanostructure changes. The micro/nanostructure of composite films was characterized by using small-angle X-ray scattering (SAXS) and X-ray diffraction (XRD), while the evolution and thermal property of semi-molecular composites were studied by using FT-IR spectroscopy and dynamic mechanical thermal analysis (DMTA). The result showed that the composite films exhibited a single glass transition behavior, which is ascribed to the molecular level mixing, in the presence of copolyimide fractions.
Journal
Polymer Bulletin – Springer Journals
Published: Aug 29, 2007