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DOI: 10.5593/SGEM2016/HB63/S09.058

GREEN GRAFTED PREVULCANISED NATURAL RUBBER LATEX TUNED FOR PHOTONIC APPLICATION

R. Mohamed, H. A. H. Shaari, M. S. Ab-Rahman
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-79-7 / ISSN 1314-2704, 2 - 5 November, 2016, Book 6 Vol. 3, 449-456pp, DOI: 10.5593/SGEM2016/HB63/S09.058

ABSTRACT
Natural Rubber had been exploited in various applications for tires in automobile industry, as rubber strips and sheets for sealants and etc. However the use of natural rubber in other specialised application such as photonic and optical devices have not been extensively explored. Green natural rubber can infect be tuned as photonic crystal arrays due to the ability of the unique ability of natural rubber to undergo strain crystallisation upon stretching. Due to diffraction of light to selective wavelength, structural colour of natural rubber photonic crystal can be reversibly tuned under strain condition. This paper describes characterization of natural rubber sheet with reversible tuning structural colour. Natural rubber sheet produced by grafting co-monomer into pre-vulcanized latex (PVL) had been fabricated. Refractive index and the thickness of the grafted PVL sheet fabricated in our studies at 632nmTE were found to have n=1.6065 and 3.64 μm thickness. Characterization was performed using Fourier Electron Scanning Electron Microscopy (FESEM), Polarized Optical Microscope (POM) and X-Ray Diffractometer (XRD). Surface morphological of investigated using FESEM and POM shows that sheet has a thin layer of grafted monomer particles embedded in pre-vulcanized natural rubber latex (PVL). POM showed stretched spots of crystal orientation upon stretching as compared to un-stretched rubber which shows discontinuous alignment. For XRD analysis, strong peaks of co-monomer and natural rubber crystal located at 2θ values around 13° to 29° can be identified. Transmission spectra of a natural rubber film in initial, stretched and recovery state from spectrophotometer installed with photomultiplier were obtained with wavelength shifts for stretched and reversible state. Optical and mechanical properties of the natural rubber photonic crystal can be used as strain imaging and smart sensing in photonic devices.

Keywords: photonic crystal, natural rubber, strain deformation, strain crystallisation

PAPER DOI: 10.5593/SGEM2016/HB63/S09.058, GREEN GRAFTED PREVULCANISED NATURAL RUBBER LATEX TUNED FOR PHOTONIC APPLICATION

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