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Polyurethane/amino‐grafted multiwalled carbon nanotube nanocomposites: Microstructure, thermal, mechanical, and rheological properties
Author(s) -
Askari Fahimeh,
Barikani Mehdi,
Barmar Mohammad,
Shokrollahi Parvin
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44411
Subject(s) - dynamic mechanical analysis , materials science , thermogravimetric analysis , nanocomposite , glass transition , polyurethane , fourier transform infrared spectroscopy , composite material , thermal stability , polymer chemistry , chemical engineering , polymer , engineering
A mixture of two different polyols, (polytetramethylene ether glycol and polydimethylsiloxane), were employed to synthesize a new structure of polyurethane (PU) with methylene diphenyl diisocyanate (MDI) and 1,4‐butanediol as chain extender. PU nanocomposites containing variable amount (0.3, 0.5, 1, and 3 wt %) of amino‐grafted multiwalled carbon nanotubes (NH 2 ‐MWNT) were prepared via in situ polymerization. The dispersion of NH 2 ‐MWNT into polymer matrix was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Fourier transform infrared spectroscopy (FT‐IR) confirmed the urethane‐urea chemical bonding between the PU chains and the NH 2 ‐MWNT. Thermal stabilities of the nanocomposites were examined with thermogravimetric analysis (TGA) and the results indicated a remarkable improvement with increasing NH 2 ‐MWNT contents. The results of dynamic mechanical thermal analysis (DMTA) including storage modulus ( E ′) and glass transition temperature ( T g ), as well as tensile properties demonstrated that the yield strength, strain‐at‐break, and young modulus were enhanced by increasing NH 2 ‐MWNT content. Rheological behavior including complex viscosity and storage and loss moduli of the PU nanocomposites improved with increasing NH 2 ‐MWNT loading, as well. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44411.