International Research Journal of Engineering and Technology (IRJET) E-ISSN: 2395-0056 Volume: 07, Special Issue | June 2020 Www.Irjet.Net P-ISSN: 2395-0072 International Conference on Recent Trends in Science & Technology-2020 (ICRTST - 2020) Organised by: ATME College of Engineering, Mysuru, INDIA © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 143 Determination of Structural and Mechanical Property of MCU-5 Cotton Fiber Manju V V 1 , Divakara S 2 , Vinayakprasanna N Hegde 3 Department of Physics, Vidyavardhaka College of Engineering, Visvesvaraya Technological University Gokulam, III Stage, Mysuru, India R Somashekar 4 Centre for material science, University of Mysore, Vijnana Bhavan, Mysuru, India -------------------------------------------------------------------------------***-------------------------------------------------------------------------- Abstract. The present study illustrates the structural properties of MCU-5 cotton using Linked atom least square (LALS) method. Also, we have computed the Mechanical properties of MCU-5 cotton fiber using X-ray diffraction data.Voigt approximation is used to determine the Bulk (K), Young’s (Y), Shear (n), Poisson’s ratio (σ) and linear tensor moduli and the 3-dimensional variations of these elastic constants are shown.Using the Peakfit ® program, 13reflections are identified and Full Width Half Maxima (FWHM) of these reflections (hkl) are used to compute the shape of ordered region along [hkl] directions. From these data, for the first time we have computed 3-dimensional image of ordered region. Keywords: Elastic constants, WAXS, LALS. ELATE. 1. INTRODUCTION Cotton fibers are used for more than 3000 years, it provides fibers for the textile industry and also oil can be extracted from its seeds[1]. Many researchers around the globe are studying the structural modifications of cotton fiber [2-6]. It belongs to the family of Gossypium [7-8]. It is purely cellulose and its structural formula is (C6H10O5)a polysaccharide. The anhydroglucose units are linked together as β-cellobiose. The number of repeating units linked together to form the cellulose polymer is called degree of polymerization. In this study, we have considered MCU-5 cotton fiber and used its X- ray diffraction (XRD) data and mathematical programs to simulate the experimental intensity profiles. To find the crystal structure parameters, we have used the LALS program which is developed in the Linux operating system. PLATON ® [9] software is used to project a polymer chain in the unit cell along different axes and using Voigt approximation we have calculated various elastic moduli and their variation along 3-dimensional axis is shown. Also, we have made an attempt to compute the shape of the crystallite region using XRD data and in-house mathematical programs. 2. EXPERIMENTAL A.Collection of samples MCU-5 is a crossbreed of Sea Island, 542, MCU-1, MCU-2 and Gatooma. It is grown from mid-August to September and ready for picking in the month of February to April. It is a major crop in the states of Andra Pradesh, Tamilnadu, Odisha, Maharashtra and Karnataka. We have collected a fresh MCU-5 cotton fiberand used it for the study after repining. The cotton buds are separated and taken for ginning, separation of cotton fiber from its seeds is called ginning. After ginning we have taken it for baling till it becomes lint. B.X-ray diffraction studies The XRD studies were conducted for the small bundles of the samples. Here the sample holder was fixed to the goniometer in such a way that the axis of rotation was parallel to axis of the sample and perpendicular to the beam of X- rays. The axis of rotation was moved parallel to imaging plate. The XRD pattern of the sample were recorded using imaging plate (DIP-3200 with dimensions 440 x 240 mm 2 ). The used X-ray target was Mo with the X-ray beam wavelength 0.71073Å. The generator settings were kept at 50 kV and 32 mA. The exposure time was 400s. The Weissenberg geometry [10] image of the sample is given in Fig. 1.