Conductive fibers from enzymatically synthesized polyaniline |
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| Affiliation: | 1. Department of Chemistry and Center for Advanced Materials, University of Massachusetts Lowell, 1 University Avenue, Lowell, MA 01854, USA;2. Natick Soldier Center, U.S. Army Soldier and Biological Chemical Command, Natick, MA 01760, USA;1. Institute of Chemistry, Federal University of Uberlândia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil;2. Department of Physics, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil;3. LIEC, Department of Chemistry, Federal University of São Carlos, 13565-905, São Carlos, SP, Brazil;1. Polymers and Pigments Department, National Research Centre, 33 El Bohouth St. Dokki, Giza, P. O. 12622, Egypt;2. Spectroscopy Department, Physics Division, National Research Centre, 33 El Bohouth St. Dokki, Giza, P. O. 12622, Egypt;1. Department of Health Administration and Policy, George Mason University, Fairfax, Virginia;2. Department of Public Health and Center for Obesity Research and Education, Temple University, Philadelphia, Pennsylvania;1. Lab. of Adhesion & Bio-Composites, Program in Environmental Materials Science, Seoul National University, Seoul 151-921, Republic of Korea;2. Department of Biosystems and Biomaterials Science and Engineering, Seoul National University, Seoul 151-921, Republic of Korea;1. Biomanufacturing Center Dept. of Mechanical Engineering, Tsinghua University, Haidian District, Beijing, 100084, China;2. Institute of Industrial Science, University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8505, Japan;3. Graduate School of Engineering, Shibaura Institute of Technology, Shibaura 3-9-14, Minato-ku, Tokyo, 108-8548, Japan;4. Department of Mechanical Engineering, Graduate School of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-033, Japan;5. Department of Chemical System Engineering, Graduate School of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-033, Japan |
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| Abstract: | Conducting polyaniline (PANI) fibers have been spun from a water-soluble form of PANI which was enzymatically synthesized. The enzyme, horseradish peroxidase (HRP) was used to polymerize aniline in the presence of sulfonated polystyrene (SPS) to directly form a water-soluble, conducting, PANI/SPS complex which combines moderate electrical conductivity with appreciable processability. The PANI/SPS complex was spun into fibers from aqueous solution using a dry-spinning technique. Thermal studies which included thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and DMA show that the complex has very good thermal stability and a Tg at 150°C. Mechanical properties of the fibers show a tenacity of 0.34 cN/dtex for the as-spun fibers with an increase to 0.56 cN/dtex after thermal stretch alignment. Wide angle X-Ray diffraction shows the presence of two weak peaks at d values of 4.16 Å and 2.95 Å for the drawn fibers, while no crystalline reflections were observed for cast films. The drawn fibers also show an order of magnitude improvement in conductivity. These results show that some degree of fiber orientation and crystallinity may be induced during processing. |
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