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Issue 3, 2018
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High performing smart hyperbranched polyurethane nanocomposites with efficient self-healing, self-cleaning and photocatalytic attributes

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Abstract

The present work reports an in situ fabrication of hyperbranched polyurethane (HPU) nanocomposites with different weight percentages of reduced graphene oxide–silver–reduced carbon nanodot nanohybrids as a nano-reinforcing material. The nanohybrid preparation was performed by a single one pot facile hydrothermal process. The nanohybrid and its nanocomposites were assessed by UV-visible, FTIR, XRD, EDX, TEM and thermal studies. The optical band gaps of the individual nanomaterials RCD (3.18), RGO (3.68 eV) and AgNPs (4.33 eV) were found to be significantly reduced in the nanohybrid (2.78 eV). The HPU nanocomposite degraded 96% aniline, 95% ethyl paraoxon organophosphate and 93% rhodamine B upon exposure to sunlight for 4 h, 2 h and 1 h 10 min, respectively. These degradations followed the pseudo-first order kinetics model. The nanocomposites exhibited major improvement in their performance in terms of elongation (1.17 fold), tensile strength (2.1 fold), scratch hardness (1.5 fold), toughness (2.9 fold) and thermal stability (22 °C). They displayed outstanding non-contact triggered shape-recovery upon exposure to microwaves (99.8%) and sunlight (99.6%) within just 20 s and 60 s, respectively. They also demonstrated efficient repeatable self-healing abilities under exposure to 20 s of microwave (99.7%) power input (360 W) and under direct exposure to sunlight (99.5%) (105 lux) for 4 min. Thus, the present work proposes this multifaceted nanocomposite with photocatalytic activity as a potential high performing self-healing and self-cleaning material.

Graphical abstract: High performing smart hyperbranched polyurethane nanocomposites with efficient self-healing, self-cleaning and photocatalytic attributes

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Publication details

The article was received on 10 Oct 2017, accepted on 27 Dec 2017 and first published on 27 Dec 2017


Article type: Paper
DOI: 10.1039/C7NJ03889E
Citation: New J. Chem., 2018,42, 2167-2179
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    High performing smart hyperbranched polyurethane nanocomposites with efficient self-healing, self-cleaning and photocatalytic attributes

    R. Duarah and N. Karak, New J. Chem., 2018, 42, 2167
    DOI: 10.1039/C7NJ03889E

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