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Molecular composites by incorporation of a rod-like polymer into a functionalized high-performance polymer, and their conversion into microcellular foams

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Abstract

Molecular composites were prepared from sulfonated modifications of polysulfone and polyphenylsulfone by incorporating relatively stiff polybenzimidazole (PBI) chains into them. The composites were characterized by Fourier-transform infrared (FT-IR) spectroscopy, differential scanning calorimetry (DSC), thermal mechanical analysis (TMA), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The FT-IR results demonstrated strong specific interactions between the sulfonated polymers and the PBI, which was presumed to be the reason for the enhanced miscibility observed. Miscibility was also indicated in the DSC and TMA results, by the presence of a single glass transition temperature (which was composition dependent), although there did appear to be a small degree of phase separation. TGA results showed improvements in the thermal stability of the polymer matrix because of the incorporation of PBI. Results from SEM were also consistent with considerable miscibility. Microcellular foams processed from these molecular composites had partial open-cell cell structures, with average cell sizes ranging from 0.2 to 5 μm, in unusual bimodal cell-size distributions.

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Acknowledgements

It is a pleasure to acknowledge the financial support provided by the Air Force Office of Scientific Research (Directorate of Chemistry and Materials Science) through grant F49620-98-1-0319.

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Authors and Affiliations

  1. Department of Chemistry and the Polymer Research Center, The University of Cincinnati, , Cincinnati, OH, 45221-0172, USA

    H. Sun & J. E. Mark

  2. University of Dayton Research Institute, 300 College Park Drive, Dayton, OH, 45469, USA

    N. Venkatasubramanian & M. D. Houtz

  3. 1187 Richfield Center, Wright Materials Research Co., Beavercreek, OH, 45430, USA

    S. C. Tan

  4. Polymer Branch, AFRL/MLBP, Wright-Patterson Air Force Base, Dayton, OH, 45433-7750, USA

    F. E. Arnold

  5. Directorate of Chemistry and Life Sciences, AFOSR/NL, Arlington, VA, 22203-1977, USA

    C. Y-C. Lee

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  1. H. Sun
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  2. N. Venkatasubramanian
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  3. M. D. Houtz
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  4. J. E. Mark
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  5. S. C. Tan
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  6. F. E. Arnold
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  7. C. Y-C. Lee
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Correspondence to J. E. Mark.

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Sun, H., Venkatasubramanian, N., Houtz, M.D. et al. Molecular composites by incorporation of a rod-like polymer into a functionalized high-performance polymer, and their conversion into microcellular foams. Colloid Polym Sci 282, 502–510 (2004). https://doi.org/10.1007/s00396-003-0974-2

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  • DOI: https://doi.org/10.1007/s00396-003-0974-2

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