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

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, 1 H NMR, 13 C 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 thermomechanical 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 1C to 95 1C, the water contact angle from 501 to 801 and reduces the corrosion rate from 9.2 Â 10 À3 to 5.29 Â 10 À5 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.

Synthesis and characterization of eco‐friendly siloxane‐semifluorinated polyurethane coatings for underwater application

“…The nonbonded CO peaks are observed at 1,727 cm −1 , and bonded CO peaks are observed at 1,632 cm −1. Further, as noticed in the case of APUS‐20% sample, the intensity of the bonded (bonded with hydrogen) CO slightly increases. This indicates that the hydrogen bonding formation could be enhanced at higher PDMS loading, through more urethane–urea linkage formation .…”

Nitrogen rich hyperbranched polyurethane‐carbon nanohorn composite: Implications on the development of multifunctional coatings

“…A carboxyl terminated precursor SA‐COOH was synthesized from SA and TEA, using the method described in our previous work . In a typical procedure, SA and TEA were taken in a three‐neck round‐bottom flask in 3:1 mole ratio.…”

“…Reports by Goswami and Singh and Kumar et al employed polycondensation technique to synthesize nitrogen‐doped polyester polyols for sorption of metals, improved anti‐corrosive and antimicrobial properties. Very recently our group has reported an A 3 + B 2 approach for developing nitrogen core hyperbranched polyester‐polyol based polyurethane coatings exhibiting high thermo‐mechanical and anti‐corrosive properties .…”

Recent developments of camphor based carbon nanomaterial: Their latent applications and future prospects

“…It was found that the combination of silica and carbon nanoparticles instilled shape recovery properties to the polymer along with the increase in other physic-chemical properties [65]. Pilla et al [66] prepared camphoric carbon nanoparticle loaded hyperbranched polyurethane hybrids for high performance coating application. A highly corrosion resistant hydrophobic coating with anti-microbial property was reported [66].…”

“…Pilla et al [66] prepared camphoric carbon nanoparticle loaded hyperbranched polyurethane hybrids for high performance coating application. A highly corrosion resistant hydrophobic coating with anti-microbial property was reported [66].…”