Preparation of Carbon Nanofiber Reinforced HDPE Using Dialkylimidazolium as a Dispersing Agent: Effect on Thermal and Rheological Properties

Authors: J. Samuel, S. Al-Enezi, A. Al-Banna

Abstract:

High-density polyethylene reinforced with carbon nanofibers (HDPE/CNF) have been prepared via melt processing using dialkylimidazolium tetrafluoroborate (ionic liquid) as a dispersion agent. The prepared samples were characterized by thermogravimetric (TGA) and differential scanning calorimetric (DSC) analyses. The samples blended with imidazolium ionic liquid exhibit higher thermal stability. DSC analysis showed clear miscibility of ionic liquid in the HDPE matrix and showed single endothermic peak. The melt rheological analysis of HDPE/CNF composites was performed using an oscillatory rheometer. The influence of CNF and ionic liquid concentration (ranging from 0, 0.5, and 1 wt%) on the viscoelastic parameters was investigated at 200 °C with an angular frequency range of 0.1 to 100 rad/s. The rheological analysis shows the shear-thinning behavior for the composites. An improvement in the viscoelastic properties was observed as the nanofiber concentration increases. The progress in the modulus values was attributed to the structural rigidity imparted by the high aspect ratio CNF. The modulus values and complex viscosity of the composites increased significantly at low frequencies. Composites blended with ionic liquid exhibit slightly lower values of complex viscosity and modulus over the corresponding HDPE/CNF compositions. Therefore, reduction in melt viscosity is an additional benefit for polymer composite processing as a result of wetting effect by polymer-ionic liquid combinations.

Keywords: HDPE, carbon nanofiber, ionic liquid, complex viscosity, modulus.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1474587

References:

[1] Fang-Chyou C. Poly(vinylidene fluoride)/polycarbonate blend-based nanocomposites with enhanced rigidity d Selective localization of carbon nano fillers and organo clay, Polymer Testing 2017, 62, 115-123.
[2] Kotal, M., Bhowmick, A.K. Polymer nanocomposites from modified clays: recent advances and challenges, Prog. Polym. Sci. 2015, 51, 127-187.
[3] 3. Bellayer, S.; Gilman, J. W.; Eidelmen, N.; Bourbigot, S.; Flambard, X.; Fox, D. M.; De long, H. C.; Trulove, P. C. 2005. Preparation of homogeneously dispersed multiwalled carbonnanotube/polystyrene nanocomposites via melt extrusion using trialkylimidazoliumcompatibilizer. Advanced Functional Materials 2005, 15, 910-916.
[4] Tatsuhiro, T.; Koichiro, Y.; Kiyohito, K.; Tokio, K. Polycarbonate Crystallization by Vapor-Grown Carbon Fiber with and without Magnetic Field, Macromolecular Rapid Communications 2003, 24, 763-767.
[5] Liwen, Z.; Xin, W.; Ru, L.; Qingwen, L.; Philip, D. B.; Yuntian, Z.. Microcombing enables high-performance carbon nanotube composites. Composites Science and Technology 2016, 123, 92-98.
[6] Mohammed, H. A. and Uttandaraman, S. A review of vapor grown carbon nanofiber/polymer conductive composites. Carbon 2009, 47, 2-22.
[7] Xiao, K.Q.; Zhang, L.C.; Zarudi I. Mechanical and rheological properties of carbon nanotube reinforced polyethylene composites, Composites Science and Technology. 2007, 67, 177–182.
[8] Hu, Y.; Liu, T.; Ding, J.L.; Zhong, W.H. Behavior of High Density Polyethylene and Nanocomposites under Static and Dynamic Compression Loadings. Polymer composites 2013, 34, 417-425.
[9] Gou, J.; O’Braint, S.; Gu, H.; Song, G. Damping Augmentation of Nanocomposites Using Carbon Nanofiber. Journal ofNanomaterials 2006, 32803,1-7.
[10] Li, B.; Wood, W.; Baker, L.; Sui, G.; Leer, C.; Zhong, W.H. 2010. Effectual dispersion of carbon nanofibers in polyetherimide composites and their mechanical and tribological properties. Polymer Engineering Science. 2010, 50, 1914–1922.
[11] Naohiro, T.; Kinji, A. High-performance polymer actuators based on an iridium oxide andvapor-grown carbon nanofibers combining electrostatic double-layer and faradaic capacitor mechanisms, Sensors and Actuators B: Chemical 2017, 240, 536-542.
[12] Fushan, G.; Anbao, Y.; Jiaqiang, X. Synthesis and electrochemical performance of a coaxial VGCF@ZnMnO3 nanocomposite as a high-capacity anode material for lithium- ion batteries. Electrochimica Acta 2016, 216, 376-385.
[13] Lozano, K. and Barrera, E. V. Nanofiber‐reinforced thermoplastic composites. I. Thermoanalytical and mechanical analyses. Journal of Applied Polymer Science 2001, 79, 125-133.
[14] Elena, I.; Igor, K.; Olga, M.; Vladimir, Y.; Jose, M. K. Structural aspects of mechanical properties of iPP-based composites. I. Composite iPP fibers with VGCF nanofiller. Journal of Applied Polymer Science 2015, 132, 41865- 41875.
[15] Jacob, S.; Hiroshi, A.; Tatsuhiro, T.; Koichiro, Y.; and Kiyohito, K. Dispersion of vapor-grown carbon fibers in ionic liquid. TANSO 2006, 223, 188-190.
[16] Micusik, M.; Omastova, M.; Pionteck, J.; Pandis, C.; Logakis, E.; Pissis, P. Influence of surface treatment of multiwall carbon nanotubes on the properties of polypropylene/carbonnanotubes nanocomposites. Polymers for Advanced Technologies 2011, 22, 38–47.
[17] Fukushima, T.; Kosaka, A.; Ishimura, Y.; Yamamoto, T.; Takigawa, T.; Ishii, N.; Aida, T. Molecular ordering of organic molten salts triggered by single-walled carbon nanotubes. Science 2003, 27, 2072- 2074.