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Optimization of Nanostructure, Mechanical Properties and Flammability of Polypropylene/Nanoclay/Flame Retardant Additive Ternary Compounds

Beyk Khorasani, Mahsa | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51296 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Bagheri, Reza
  7. Abstract:
  8. Today, in many industries polypropylene is used as a polyolefin with favorable properties such as chemical resistance, fatigue strength, electrical insulation, as well as good mechanical properties such as high Yang modulus, good toughness, and so on. On the other hand, polyolefins have poor thermal resistance and high flammability. Over the years, many researchers have been working to reduce their flammability through different methods and increase their thermal resistance. Among these methods, adding materials that delayed flammability or stoped it, can be noted. In the industry, these anti-flammable additives are called flame retardants. Flame retardant additives should be selected to improve not only the anti-inflammatory properties but also to not degrade or undermine other properties of the base polymer. In this study, a mixture of two type of polypropylene with business name Z30S and 440L with a 1: 1 ratio was prepared. Then the flame retardant additives with commercial names DBDPO and EPFR100D and also clay were added to the mixture. The specimens were prepared by using a twin extruder and injection machine, and their thermal, mechanical, flammability and microstructure properties, and the effect of nanoclay on the function of flame retardants in polypropylene were investigated. Improvement of anti-inflammatory properties and increase of thermal resistance were confirmed by the addition of these materials by TGA, DSC, UL94V and LOI tests. Mechanical tests also showed an increase in the Young's modulus about 50% and a reduction in impact strength about 40%. Phases were analyzed by SEM images. The XRD analysis was performed to determine the distribution of nanoclay in the samples and increase in interlayer spacing of silicate layers about 10% was seen, and finally it was concluded that the nanoclay had a better impact on the flame retardant which act in gas phase
  9. Keywords:
  10. Mechanical Properties ; Microstructure ; Polypropylene ; Polymer Composites ; Flammability

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