Interaction of SWCNT and PPTA with sulfuric acid—Compatibilization of two materials in a common solvent |
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| Authors: | Daniel P N Vlasveld Hartmut R Fischer Erik Swierenga Stephen J Picken |
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| Institution: | 1. NanoStructured Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands;2. Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands;3. TNO Industrie en Techniek, P.O. Box 6235, 5600 HE Eindhoven, The Netherlands;4. Teijin Twaron BV Research Institute, P.O. Box 9600, 6800 TC Arnhem, The Netherlands |
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| Abstract: | The results of a calorimetric study on the melting and crystallization behavior of concentrated sulfuric acid containing dispersed single wall carbon nanotubes (SWCNT), dissolved water, and dissolved poly‐p‐phenyleneterphthalate (PPTA) polymer are presented. The measured reduction of the heat of crystallization is caused by the build‐up of an associated layer of structured acid molecules around SWCNT and PPTA. The freezing point depression is related to the number of dissolved species such as ions. It is shown that this theory accurately describes the experimental data for dissolved water and sulfur trioxide, but not for large molecules such as SWCNT. A mechanism for the interaction between sulfuric acid and SWCNT is proposed, based on preferred adsorption of sulfur trioxide and dissociation of sulfuric acid, leading to an increased number of dissolved low‐molecular‐weight species. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 1914–1922, 2008 |
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| Keywords: | DSC PPTA single wall carbon nanotubes sulfuric acid |
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