Zyane A.,University of Quebec at Trois - Rivieres |
Zyane A.,Laboratoire Of Chimie Bioorganique Et Macromoleculaire Lcbm |
Belfkira A.,Laboratoire Of Chimie Bioorganique Et Macromoleculaire Lcbm |
Brouillette F.,University of Quebec at Trois - Rivieres |
And 2 more authors.
Journal of Applied Polymer Science | Year: 2016
An economic and environment friendly process was adapted to synthesize new dielectric composite materials. Using ethylene vinyl acetate (EVA)/vinyl ester of versatic acid (VeoVa) terpolymer as an aqueous emulsion provides a homogenous dispersion of BaTiO3 (BT) particles, due to the high viscosity and polarity of the vinyl resin (VR). Composites films were obtained from these dispersions by water evaporation. The evolution of the dielectric properties as a function of the BaTiO3 content, was correctly fitted by a Maxwell-Garnett model. This fitting of the experimental curve shows a good dispersion of filler in the vinyl resin and the particles separation by a layer of resin as expected for the preparation method used in this study. The VR/BT composites show good synergy between the dielectric properties of the different phases of the composites due to the formation of macrodipoles and to the strong interactions between polar EVA/VeoVa groups and the BaTiO3 particles surface. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 44333. © 2016 Wiley Periodicals, Inc.
Dahmane E.M.,Laboratoire Of Chimie Bioorganique Et Macromoleculaire Lcbm |
Taourirte M.,Laboratoire Of Chimie Bioorganique Et Macromoleculaire Lcbm |
Eladlani N.,Laboratoire Of Chimie Bioorganique Et Macromoleculaire Lcbm |
Rhazi M.,Mohammed V University
International Journal of Polymer Analysis and Characterization | Year: 2014
The contents of the exoskeleton of Parapenaeus longirostris from Moroccan local sources were analyzed and the percentages of inorganic salt, protein, lipid, and chitin were determined. Chitin in the α form was extracted from Parapenaeus longirostris shells by 0.25 M HCl and 1 M NaOH treatment for demineralization and deproteinization, respectively. The obtained chitin was converted into the more useful soluble chitosan. The chemical structure and physico-chemical properties of chitin and chitosan were characterized using Fourier transform-infrared (FT-IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, X-ray diffractometry (XRD), and scanning electron microscopy (SEM). The molecular weight (MW) of chitosan was determined by viscometric methods. The degree of acetylation (DA) of chitin and chitosan was determined by the 1H NMR technique. To the best of our knowledge this is the first report on the extraction and characterization of chitin and chitosan from Parapenaeus longirostris. © 2014 Copyright Taylor & Francis Group, LLC.