NDLI: Biosourced graphitic nanoparticle loaded hyperbranched polyurethane composites – application as multifunctional high-performance coatings

Content Provider	Royal Society of Chemistry (RSC)
Author	Rao, Chepuri R. K. Raju, K. V. S. N. Pilla, Srinivasarao Gaddam, Rohit Ranganathan Narayan, Ramanuj
Copyright Year	2015
Abstract	The present work reports the development of a novel nitrogen rich hyperbranched polyurethane-urea nanocomposite using bio-sourced graphitic nanoparticles as an effective filler. Initially, a nitrogen rich hyperbranched polyol is obtained by a two step polycondensation reaction between castor oil derived sebacic acid and triethanolamine. The formation of the hyperbranched polyol was confirmed by using various spectroscopic techniques like FTIR, 1H NMR, 13C NMR and ESI-MS. The resulting hyperbranched polyol with 80% degree of branching was further reacted with carboxyl terminated graphitic nanoparticles in different weight percentages (0, 0.1 and 0.5% with respect to polyol weight) along with a diisocyanate (maintaining an OH : NCO ratio of 1 : 1.2) in order to get polyurethane-urea graphitic nanoparticle hybrid nanocomposites. The results suggest that the incorporation of graphitic nanoparticles improves the thermo-mechanical properties, hydrophobic nature, and bacterial and corrosion resistance of the polyurethane nanocomposite. It is seen that a minuscule incorporation of 0.5% graphitic nanoparticles into the polyurethane matrix improves the storage modulus from 365 to 996 MPa, the glass transition temperature from 67 °C to 95 °C, the water contact angle from 50° to 80° and reduces the corrosion rate from 9.2 × 10−3 to 5.29 × 10−5 mm per year in comparison with neat polyurethane. All these improvements in properties are accredited to the covalent linkage, geometry and uniform distribution of graphitic nanoparticles with the polyurethane matrix. In addition, all the polyurethane hybrids show good stability against various bacterial stains.
Starting Page	7219
Ending Page	7226
Page Count	8
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	9
Journal	New Journal of Chemistry
DOI	10.1039/c5nj01649e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Nanoparticle Hydrophobe Nitrogen Composite material Molecular geometry Glass transition Water contact Letter case Corrosion Castor oil Isocyanate Discrete uniform distribution Polyurethane Covalent bond Triethanolamine Nanocomposite NCO Polyol Condensation polymer Nuclear magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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