Review Article Volume 10:4, 2021 Journal of Material Sciences & Engineering Novel Approach for Obtaining Nanocomposites with a High Percentage of Mwcnts Reinforcement and Elastomeric Materials PU/MWCNT Khaled Chawraba 1,2 , Abdallah Nassereddine 3 , Hareth Sleiman 1 , Joumana Toufaily 1 , Jacques Lalevée 2,4 and Tayssir Hamieh 1* 1 Laboratory of Materials, Catalysis, Environment and Analytical Methods (MCEMA) and LEADDER Laboratory, Faculty of Sciences and EDST, Lebanese University, Hariri Campus, Hadath, Beirut, Lebanon 2 CNRS, IS2M UMR 7361, Université de Haute-Alsace, F-68100 Mulhouse, France 3 Department of sciences, Paris-Diderot University, Paris, France 4 Université de Strasbourg, 67081 Strasbourg, France Introduction Polyurethane (PU) is one of the most interesting synthetic elastomers [1]. Due to its unique properties, the linear structure of segmented PU appears in the form of (AB) n. The flexible segment B is normally formed of a polyester or a polyether macromolecular molecular weight between 1000 and 3000, and the hard segment A consists of a diisocyanate. Because of the difference in chemical structure, micro-Areas forming between the soft segments and the hard segments and joined by a resulting mutual attraction of intermolecular hydrogen bonds. The incorporation of nanoparticles can considerably improve the properties of the polymer nanocomposite [2-4]. Carbon nanotubes (CNT) as an interesting additive due to their superior properties such as electrical, thermal, and mechanical and high length/ diameter ratio, low density, and strength make them favorable additives for reinforcement. To fabricate CNT nanocomposites with effective reinforcement a good dispersion is needed, and formation of a strong covalent and noncovalent interaction with the matrix [2,5-7]. the choice of polyurethanes (PU) to preparation of nanocomposites with carbon nanotubes (CNTs), because is having special properties such as high resistance to abrasion, hardness, elastic modulus, tensile strength, and elongation at break, among others [8,9]. These properties promote the choice of this composites to be used in a large variety of fields such as aerospace, automotive, electronics, medical, oil and gas, mining and construction [10,11]. Since their discovery in 1991 by Iijima [12], unique and novel properties of carbon nanotubes (CNTs) and technological possibilities, offering the polymer-CNT composites, such as improved mechanical, electrical and thermal properties, continue to draw the attention of global research. To date, literature studies have been converged on the methods of distribution and dispersion of carbon nanotubes in the polymer matrix and, on the interaction aspects of the polymer chains and carbon nanotubes can be promoted. Many researchers have studied different PU types reinforced multiwalled carbon nanotubes (MWCNTs) [13,14]. CNTs are most widely used in composites, not only for improving mechanical properties, but also for enhancing electrical, [15] thermal, and electromagnetic interference shielding properties [13]. Novel carbon nanotube-polymer composites open opportunities for new multi-functional materials with broad commercial and defense applications. The big challenges encountered in making such a composite are the uniform dispersion of carbon nanotubes in a polymer matrix without agglomerates and entanglements, and the improved nanotubes-resin interface adhesion. The dispersion of the nanotubes in the PU matrix was always a key issue. The functionalization of the nanotubes leads to a better dispersion of high carbon contents. Buffa and Resasco [16] used the functionalized nanotubes which contain hydroxyl groups to improve the interaction with the urethane groups via hydrogen bonding. The study of composite structure shows that carbon nanotubes can be dispersed in the matrix of polyurethane. Another group of researchers [17] managed to fix on the nanotube carboxylic group- COOH by oxidation reaction, thus, chemical bonding of carbon nanotubes in the matrix of the polyurethane was confirmed by infrared spectra Fourier transform (FTIR). *Address for Correspondence: Tayssir Hamieh, Laboratory of Materials, Catalysis, Environment and Analytical Methods (MCEMA) and LEADDER Laboratory, Faculty of Sciences and EDST, Lebanese University, Hariri Campus, Hadath, Beirut, Lebanon, Email: tayssir.hamieh@ ul.edu.lb Copyright: © 2021 Khaled Chawraba, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Received date: 19 March, 2021; Accepted date: 5 April, 2021; Published date: 12 April, 2021 ISSN: 2169-0022 Open Access Abstract Novel nanocomposites based on polyurethane/carbon nanotube and incorporation of functional groups (hydroquinone and citric acid) were prepared by “solution casting method”. In this work, a high percentage of carbon-nanotubes (CNTs) was introduced successfully into the polyurethane. The samples were characterized by scanning electron microscopy (SEM); the results obtained showed a high dispersion of CNTs on polymer. Then, the thermal stability of the nanocomposites was evaluated by thermal gravimetric analysis (TGA), and the mechanical properties were evaluated by tensile test. Compared to pure polyurethane, the nanocomposites, with high loading of CNTs, displayed better thermal stability and mechanical properties (high elongation at break-1000%). Keywords: Dispersion • Elastomers • Mechanical properties • Nanocomposites • Polyurethanes`