Advances in Chemical and Biological Engineering
Volume 1 | Issue 2 | Pages 01-12
In-Situ polymerization and characterization of polyurethane-urea/diamond nanocomposites
Meisam Barikani 1, Mohammad Reza Kalaee 1, Saeedeh Mazinani 2, Mehdi Barikani 1, 3
1Department of Polymer Engineering, Tehran South Branch, Islamic Azad University, Tehran, Iran.
2Amirkabir Nano Technology Research Institute, Amirkabir University of Technology, Tehran, Iran.
3Department of Polyurethane, Faculty of Science. Iran Polymer and Petrochemical Institute, Tehran, Iran.
Nanodiamond as a nanoparticle has been widely used in different applications including polymer nanocomposites due to its excellent properties. For this purpose it is utilized to apply and study the effect of nanodiamond in polyurethane–urea matrix. Polyurethane-urea/diamond nanocomposites were prepared using polycaprolactone diol, 4, 4′-methylene bis (cyclohexyl) diisocyanate, methylene ortochloroaniline and diamond nanoparticles. The molecular structure of the polymer nanocomposites and dispersion of nanodiamonds were characterized and studied by FTIR and, 1HNMR spectroscopy, X-ray diffraction, Scanning electron microscopy, and Transmission electron microscopy. Disappearance of isocyanate NCO peak measured by FTIR spectroscopy and formation of NH bond measured by NMR spectroscopy confirmed completion of the reaction and polymer formation. Micrographs of scanning and transmission electron microscopy showed reasonable dispersion of nanoparticles throughout the polymer matrix, especially in lower percentage of nanodiamond particles. This may beexplained by evidenceoffunctional groups on the surface of nanodiamond which suggests good interaction with polymer matrix. Agglomeration of nanodiamond particles is also observed by scanning and transmission electron microscope which is ascribed to the high surface free energy of nanodiamond particles. This is more obvious by the increasing amount of nanodiamond in polyurethane-urea matrix. Results of differential scanning calorimetry and thermal gravimetric analysis also showed improvement in thermal properties of prepared polymers.
Keywords: Polyurethane-urea, Nanodiamond, Nanocomposite, Synthesis, Characterization