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Sono-synthesized sword-like zinc oxide and its use as a filler in polyurethane composites

C. PHOLNAK1, C. SIRISATHITKUL1,* , S. DANWORAPHONG1, D. J. HARDING1

Affiliation

  1. Molecular Technology Research Unit, School of Science, Walailak University, Nakhon Si Thammarat, 80161 Thailand

Abstract

Zinc oxide (ZnO) particles with sword-like morphology were sonochemically synthesized from Zn(NO3)2−C6H12N4 aqueous vsolutions at 90°C. After the crystal growth, the ultrasonic irradiation facilitates the erosion process at the ends of hexagonal ZnO rods resulting in a sword-like morphology and reduces the overall crystal size. Increasing the ratio of C6H12N4 to Zn(NO3)2 from 1:2 to 5:1 increases the density of sword-like ZnO clusters. An extra absorption peak in the ultraviolet (UV) regime is observed in commercial polyurethane loaded with the surface modified ZnO. The dispersion of 15 wt% ZnO gives rise to a stronger UV absorption than that by 5 wt% ZnO..

Keywords

Sonochemical synthesis, Zinc oxide, Polyurethane composites, Ultraviolet absorption.

Submitted at: March 17, 2012
Accepted at: June 6, 2012

Citation

C. PHOLNAK, C. SIRISATHITKUL, S. DANWORAPHONG, D. J. HARDING, Sono-synthesized sword-like zinc oxide and its use as a filler in polyurethane composites, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 5-6, pp. 441-447 (2012)