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Polyvinyl Alcohol-Graphene Oxide Nanocomposites: Evaluation of Flame-Retardancy, Thermal and Mechanical Properties Publisher



Zamani M1, 2 ; Gholibegloo E3 ; Aghajanzadeh M2 ; Salehian F3 ; Sadat Ebrahimi SE4 ; Ganjali MR5, 6 ; Mahdavi H1 ; Khoobi M3, 7
Authors
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Authors Affiliations
  1. 1. School of Chemistry, University College of Science, University of Tehran, Tehran, Iran
  2. 2. School of Pharmacy, Department of Pharmaceutical Biomaterials, Zanjan University of Medical Sciences, Zanjan, Iran
  3. 3. Biomaterials Group, The Institute of Pharmaceutical Sciences (TIPS), Tehran University of Medical Sciences, Tehran, Iran
  4. 4. School of Pharmacy, Department of Medical Chemistry, International Campus, Tehran University of Medical Science, Tehran, Iran
  5. 5. Faculty of Chemistry, Center of Excellence in Electrochemistry, University of Tehran, Tehran, Iran
  6. 6. Biosensor Research Center, Endocrinology & Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
  7. 7. Department of Pharmaceutical Biomaterials and Medical Biomaterials Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran

Source: Journal of Macromolecular Science# Part A: Pure and Applied Chemistry Published:2020


Abstract

The graphene-based additives containing polyethyleneimine (PEI) or hydroxyapatite (HAP) were synthesized and their effects on the flame retardancy, thermal, mechanical properties of polyvinyl alcohol (PVA) matrix were evaluated. Thermogravimetric analysis studies (TGA) and Scanning electron microscope (SEM) images were indicated that PEI and HAP have a strong influence on the fire behavior of the composites which might be explained by the forming of a uniform and compact char during combustion. The presence of nitrogen in PEI and phosphorus in HAP which are generated nonflammable gases and phosphoric radicals, respectively at combustion conditions could represent a significant role in the catalytic char residue formation, heat transfer limitation and then diminish or even stop the combustion reactions. The char yields of the 5 wt% PVA/GO-PEI nanocomposites were increased up to 22 folds without any significant change in mechanical properties; Moreover, the char yield of PVA/GO-HAP nanocomposites was more than pure PVA (24 folds) because of its thermal stability at high temperature. All these data demonstrated that not only did PVA/GO-PEI keep the mechanical properties nearly the same as in pure PVA but also improved flame retardancy. But, the PVA/GO-HAP has great potential as flame retardants between all obtained composites. © 2019, © 2019 Taylor & Francis Group, LLC.