نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد، دانشکده شیمی کاربردی، دانشگاه تهران، تهران، ایران

2 دانشیار، صنایع پلیمر، دانشگاه تهران، تهران ، ایران

3 کارشناس ، دانشکده مهندسی شیمی، دانشگاه تهران، تهران، ایران

چکیده

پلی‌آنیلین به‌روش شیمیایی توسط اکسید کننده آمونیوم پرسولفات در محیط اسیدی آبی سنتز شد. نانو کامپوزیت‌های پلی‌آنیلین با افزودن مقادیر مختلف از نانوذرات اکسیدروی (5-1 درصد) به‌روش ریخته‌گری تهیه شد. با تبخیر حلال، فیلم‌های پلی‌آنیلین و نانو‌کامپوزیت‌های مربوطه به‌دست آمد. ترکیب، مورفولوژی (شکل شناسی) و ساختار پلی‌آنیلین و نانو‌کامپوزیت‌های آن به‌وسیله طیف‌سنجی FTIR، میکروسکوپ الکترونی روبشی (SEM) و الگوهای پراش اشعه–X XRD)) مورد بررسی قرار گرفت. همچنین از آزمون تجزیه گرما وزنی (TGA) برای بررسی پایداری حرارتی و آزمون کشش برای بررسی خواص مکانیکی محصولات استفاده شد و رسانایی پلی‌آنیلین و نانو‌کامپوزیت‌های حاصل نیز به‌روش چهار نقطه‌ای اندازه‌گیری شد. در طیف FTIR پیک‌های شاخص پلی‌آنیلین در نتیجه پیوند هیدروژنی به‌سمت اعداد موجی پایین‌تر جابه‌جا شدند. نتایج حاصل از الگوهای XRD بیانگر افزایش درصد بلورینگی نانو‌کامپوزیت در مقایسه با پلیمر خالص است. همچنین شدت پیک‌ها نیز در حضور نانو ذرات اکسید‌روی افزایش یافته است. نتایج TGA نیز بیانگر کاهش تخریب پلیمراست. بررسی خواص مکانیکی نیز نشان دهنده افزایش مدول یانگ و استحکام در نقطه شکست نانو‌کامپوزیت است. به‌علاوه رسانایی نانو‌کامپوزیت‌ها نسبت به پلیمر خالص کاهش پیدا کرد

کلیدواژه‌ها

عنوان مقاله [English]

Preparation and properties investigation of conductive Polyaniline-Zinc Oxide nanocomposites

نویسندگان [English]

  • Hamid Gholami 1
  • Alireza Shakeri 2
  • Seyed Hesam Moosavi 3

1 Department of Chemistry, University of Tehran, Tehran, Iran

2 Department of chemical Engineering, Tehran University, Tehran, Iran

3 Department of chemical Engineering, Tehran University, Tehran, Iran

چکیده [English]

Polyaniline was synthesized chemically in acidic medium in the presence of ammonium peroxydisulphate (APS) as oxidizing agent. PANI-ZnO nanocomposites prepared in the presence of various amount of nano ZnO (from 1 to 5 wt.%) by solution casting method, free standing film of polyaniline and its nano-composites was obtain by vaporization of solvent content. The composition, morphology and structure of the polymer and the nanocomposites were characterized by Fourier transform infrared spectroscopy FT-IR spectra, scanning electron microscopy (SEM) image and XRD pattern also thermal stability was studied by TGA analysis, electrical conductivity was measured by four point probe technique and mechanical properties were studied by tensile strength. The characteristic FTIR peaks of PANI were found to shift to lower number in nanocomposites due to formation of H-bonding. XRD results revealed that the crystallinity of PANI was more pronounced after addition of nano ZnO, while the intensity of the peaks increased by addition of ZnO nanoparticles. Also, TGA results showed that the decomposition of the nanocomposite was less than that of pure polyaniline which confirms the successful fabrication of products. Young’s modulus and strength at break point was increased in case of Nanocomposite, Addition electrical conductivity of the PANI–ZnO nanocomposite film was found to be smaller than that of the PANI film.

کلیدواژه‌ها [English]

  • Conductive polymer
  • Polyaniline based
  • nanocomposite properties
  • Nano ZnO

[1] Soundararajah, Q. Y. Karunaratne, B. .S .B. and Rajapakse, R. .M .G.,       “Montmorillonite polyaniline nanocomposites: Preparation, characterization and investigation of mechanical properties”, Materials Chemistry and Physics, Vol. 113, pp. 850–855, 2009.

[2] Alexandre, M. and Dubois, P., “Polymer-layered silicate nanocomposites: preparation, properties and uses of a new class of materials”, Materials Science and Engineering, Vol. 28, pp. 1–63, 2000.

[3] Eren, B. Aydin, R. and Eren, E., “Morphology and thermal characterization of montmorillonite/ polybenzimidazole nanocomposite”, Journal of Thermal Analysis and Calorimetry, Vol. 15, pp. 1525-1531, 2014.

[4] Olad, A. Barati, M. and Behboudi, S., “Preparation of PANI/epoxy/Zn nanocomposite using Zn nanoparticles and epoxy resin as additives and investigation of its corrosion protection behavior on iron”, Progress in Organic Coatings, Vol. 74, pp. 221– 227, 2012.

[5] Ansari, M. O. and Mohammad, F., “Thermal stability and electrical properties of dodecyl benzene sulfonic acid doped nanocomposites of polyaniline and multi-walled carbon nanotubes”, Composites: Part B, Vol. 43, pp. 3541–3548, 2012.

[6] Shirakawa, H. Louis, E. J. MacDiarmid, A. G. and Chiang, C. K., “Synthesis of electrically conducting organic polymers: halogen derivatives of poly(acetylene), (CH)x, Journal of the Chemical Society”, Chemical Communications, Vol. 16, pp. 578–9, 1977.

[7] Wang, Y. Tran, H. D. Liao, L. Duan, X. and Kaner, R. B., “Nanoscale morphology, dimensional control, and electrical properties of oligoanilines”, Journal of the American Chemical Society, Vol. 132, pp. 10365–73, 2010.

[8] Kim, S. Ko, J. M. and Chung, I. J., “Electrical conductivity change ofpolyaniline–dodecyl benzene sulfonic acid complex with temperature”, Polymers for Advanced Technologies, Vol. 7, pp. 599–603, 1996.

[9] Niziol, J. Sniechowski, M. and Pielichowski, J., “Alternative oxidizers in polyaniline synthesis”, Polymer Bulletin, Vol. 66, pp. 761–70, 2011.

[10] Olad, A. and Rashidzadeh, A., “Preparation and anticorrosive properties of PANI/Na-MMT and PANI/O-MMT nanocomposites”, Progress in Organic Coatings, Vol. 62, pp. 293–298, 2008.

[11] Ryu, K. S. Kim, K. M. Kang, S. G. Lee, G. L. Joo, J. and Chang, S. H., “Electrochemical and physical characterizationof lithium ionic salt doped polyaniline as a polymer electrode of lithium secondary battery”, Synthetic Metals, Vol. 110, pp. 213–17, 2010.

[12] Nakajima, T. and Kawagoe, T., “Polyaniline: structural analysis and application for battery”, Synthetic Metals, Vol. 28, pp. 629–38, 1998.

[13] Qiao, Y. Li, C. M. Bao, S. J. and Bao, Q. L., “Carbon nanotube/polyaniline composite as anode material for microbial fuel cells”, Journal of Power Sources, Vol. 170, pp. 79–84, 2007.

[14] Chen, J. Li, B. Zheng, J. Zhao, J. Jing, H. and Zhu, Z., “Polyaniline nanofiber/carbon film as flexible counter electrodes in platinum free dye sensitized solar cells”, Electrochimica Acta, Vol. 56, pp. 4624–30, 2011.

[15] Olad, A. Barati, M. and Shirmohammadi, H., “Conductivity and anticorrosion performance of polyaniline/zinc composites: Investigation of zinc particle size and distribution effect”, Progress in Organic Coatings, Vol. 72, pp. 599– 604, 2011.

[16] Lin, P. and Yan, F., “Organic thin film transistors for chemical and biological sensing”, Advanced Materials, Vol. 24, pp. 34–51, 2012.

[17] Jaymand, M., “Recent progress in chemical modification of polyaniline”, Progress in Polymer Science, Vol. 38, pp. 1287– 1306, 2013.

[18] Lotfi. R., “Investigation of the effect of annealing on the photoluminescence properties of ZnO nanoparticles, synthesized at low temperature”, Optical Materials, Vol. 35, pp. 657-660, 2013.

[19] He, Y., “A novel emulsion route to sub-micrometer polyaniline/nano-ZnO composite fibers”, Applied Surface Science, Vol. 249, pp. 1–6, 2005.

[20] Mostafaeia, A. Zolriasatein, A., “Synthesis and characterization of conducting polyaniline nanocomposites containing ZnO nanorods”, Progress in Natural Science, Materials International, Vol. 22, pp. 273–280, 2012.

[21] Shi, L., Wang, X. Lu, L. Yang, X. and Wu, X., “Preparation of TiO2/ polyaniline Nanocomposite from alyo tropic liquid crystalline solution”, Synthetic Metals, Vol. 159, pp. 2525–2529, 2009.