Synthesis and characterizations of polyvinyl alcohol-graphite electrospun nanofibers

Sedighin, Hanieh; Enayati, Mohammad Hossein

Synthesis and characterizations of polyvinyl alcohol-graphite electrospun nanofibers

Document Type : Original Research

Authors

H. sedighin ¹

M. H. Enayati ²

¹ Naghshejahan Esfahan Institute of Higher Education

² Recherch Institute for Nanotechnology and Advanced Materials, Isfahan University of Technology

Abstract

Research subject: Polymer nanofibers have attracted much industrial interest over the past decade. In general, these fibers are suitable for a variety of applications including medical applications, insulation, capacitors, advanced aerospace technologies, and so on. Specifically in aerospace technology, the used materials must be thermally stable with suitable electrical conductivity. However, many of these polymer nanofibers suffer from low temperature degradation and low electrical conductivity, limiting their use in many potential applications. Graphite has unique properties such as high conductivity and high thermal stability. This exceptional material can be included as a nanoparticle in polymer nanofibers to modify electrical and thermal properties.The aim of this research was to investigate the effect of addition of graphite nanoparticle on thermal and electrical propertiesof polymer fibers.

Research approach: For this purpose, polyvinyl alcohol 72000 (PVA) as a non-conductive polymer and graphite nanoparticles were used. Polyvinyl alcohol-graphite nanofibers were synthesized method by electrospinning technique under optimized parameters. The optimum conditions for the electrospinning process were: PVA concentration of 8%, applied voltage of 22 Kv, flow rate of 10 ml and tip/collector distance of 20 cm.

Main results: Scanning electron microscopy (SEM) studies showed that produced PVA fibers were smooth, continuous without any bead, with a diameter of about 350 nm. The PVA / graphite nanofibers were also smooth but much thinner (about 200 nm) than PVA fibers at the same processing parameters. Moreover, X-ray patterns of PVA/graphite nanofibers include peaks of graphite particles in the structure and slso the suppression of crystallinity. According to the results of 4 point probe teste, by increasing weight percentage of graphite in the fibers, electrical conductivity increased up to 0.5 . The thermal behavior of PVA nanofibers after mixing with graphite was also investigated by differential calorimetry analysis (DSC) and TGA. It was demonstrated that PVA / graphite nanofibers are thermally stable up to 300 ° C.

Keywords

Electrospinning

Graphite

Nanofiber

poly vinyl alcohol/ graphite

conductivity

Thermal stability

Subjects

nano-composite

Kausar.A، Ullah-Shah .M, M., An Investigation on Novel Poly(Thioureaamide)Based Nanocomposites Reinforced with Silica Nanotubes, Polym.-Plast. Technol. Eng, 53,pp. 223-228, 2014.
Gao,J. Shen,K. Bao,F. Yin,J. Wang,D. Zhang,X., Preparation and Characterization of a Graphene Oxide Film Modified by the Covalent Attachment of Polysiloxane, Polym. Plast. Tech. Eng، pp. 553-557، 2013.
Kausar.A, Ashraf.R., Polymer-Nanodiamond Composites in Li-ion Batteries: A Review, Polym.-Plast Technol. Eng , 53، pp. 1-14، 2014.
Kausar,A، S. Hussain,S., Novel Hybrids Derived from Poly(Thiourea-Amide)- Epoxy and Carbon Nanotubes, Polym.-Plast. Technol. Eng, 52,، pp. 1169-1174، 2013.
Naz,A .Kausar ,A., Fabrication and Properties of Novel Polyaniline/Poly(Styrene-Co-Maleic anhydride) Cumene Terminated/4, 4-Oxydianiline/ Graphite-Based Nanocomposites via Layered Polymerization, Polym.-Plast. Technol. Eng., DOI: 10.1080، 2014.
Krupa,I، Cecen,V., Mechanical Properties and Morphology of Composites Based on the EVA Copolymer Filled With Expanded Graphite, Polym. Plast. Tech. Eng. 51، pp. 1388-1393، 2012.
Amara,N، Ayesha,K ., Polymer/Graphite Nanocomposites: Physical Features, Fabrication and Current Relevance, Polym. Plast. Tech. Eng , 51، pp. 3-14، 2015.
Montagna.L, Fim.F, Galland.G , Basso.N., Synthesis of Poly(propylene)/ Graphite Nanocomposites by in Situ Polymerization, Macromolecular Symposia، pp. 48-56. 299-300، 2011.
Chen,G. Wu,C . Weng, W., Preparation of Polystyrene/Graphite Nanosheet Composite, Polymer, 44، pp. 1781-1784، 2003.
Krupa,I.، I. Novák و I. Chodák., Electrically and Thermally Conductive Polyethylene/Graphite Composites and Their Mechanical Properties, Synth. Metals , 145، pp. 245-252، 2004.
Uleanya, K., Eboatu, A.N., Comparative Studies of the Effects of Doping on the Electrical and Thermal Conductivities of Polystyrene, Pacif. J. Sci. Technol. 15,200-205, 2014.
Tantis, I.; Psarras.G., Functionalized Graphene–Poly(vinyl alcohol) Nanocomposites: Physical and Dielectric Properties, Exp. Polym. Lett., 6, 283-292, 2012.
Wang ,W., Preparation and Characterization of Polystyrene/Graphite Composite Prepared by Cationic Grafting Polymerization, Polymer, 45, 3987-3995, 2004.
Galpaya,D، M. Liu., Recent Advances in Fabrication and Characterization of Graphene-Polymer Nanocomposites , Graphene , 1، pp. 30-49، 2012.
Joachim,T. C. Drawing a Single Nanofiber over Hundreds of Microns, Europhysice Letters, Vol.42, pp.215-220.1998.
Gharehaghaji.A ,A.R , Principles and Technilogies of Nanofibrous Structures Production(presian), Jahad daneshgahi- Isfahan, 2010.
Koysuren.O., Preparation and Characterization of Polyvinyl Alcohol/Carbon Nanotube (PVA/CNT) Conductive Nanofibers, Polymer Eng; 32: PP.407–413, 2012.
Frank.K. Ko, Y. Wan., Introduction to Nanofiber Materials, Cambridge University Press,2014.
Uhlir,A., The Potentials of Infinite Systems of Sources and Numerical Solutions of Problems in Semiconductor Engineering, Bell Syst. Tech. J. 34 (1955) 105–128.
Gupta,S,A,A,T., Composition Dependent Structural Modulations in Transparent Poly(vinyl alcohol) Hydrogels, ISIJ, Biointerfaces 74, pp. 186–190, 2009.
Haider, A. K., A Comprehensive Review Summarizing the Effect of Electrospinning Parameters and Potential Applications of Nanofibers in Biomedical and Biotechnology, Arabian Journal of Chemistry 11, no. 8 ، pp. 1165-118، 2018.
Tao.J, Shivkumar,S., Molecular Weight Dependent Structure Regimes During the Electrospining of PVA, Materials Letters, Vol 61, pp 2325-2328,2007.
Park.Y, Myungil.Y., Thermal Conductivity Enhancement in Electrospun Poly(vinyl alcohol) and Poly(vinyl alcohol)/Cellulose Nanocrystal Composite Nanofibers, Scientific Reports, 2019.