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Vegetable Oil-Based Hyperbranched Thermosetting Polyurethane/Clay Nanocomposites

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Author(s): Deka Harekrishna | Karak Niranjan

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 4;
Issue: 7;
Start page: 758;
Date: 2009;
Original page

Keywords: Vegetable oil | Mesua ferreaL. seed oil | Nanocomposites | Hyperbranched polyurethane | Mechanical properties | Thermal properties

ABSTRACT
Abstract The highly branched polyurethanes and vegetable oil-based polymer nanocomposites have been showing fruitful advantages across a spectrum of potential field of applications.Mesua ferreaL. seed oil-based hyperbranched polyurethane (HBPU)/clay nanocomposites were prepared at different dose levels by in situ polymerization technique. The performances of epoxy-cured thermosetting nanocomposites are reported for the first time. The partially exfoliated structure of clay layers was confirmed by XRD and TEM. FTIR spectra indicate the presence of H bonding between nanoclay and the polymer matrix. The present investigation outlines the significant improvement of tensile strength, scratch hardness, thermostability, water vapor permeability, and adhesive strength without much influencing impact resistance, bending, and elongation at break of the nanocomposites compared to pristine HBPU thermoset. An increment of two times the tensile strength, 6 °C of melting point, and 111 °C of thermo-stability were achieved by the formation of nanocomposites. An excellent shape recovery of about 96–99% was observed for the nanocomposites. Thus, the formation of partially exfoliated clay/vegetable oil-based hyperbranched polyurethane nanocomposites significantly improved the performance.

Tango Jona
Tangokurs Rapperswil-Jona

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