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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/037/05/1113-1121

    • Keywords

       

      Differential scanning calorimeter; non-isothermal crystallization kinetics; nanocomposites; polymer.

    • Abstract

       

      Non-isothermal crystallization kinetics of pure medium density polyethylene (MDPE) and MDPE–clay nanocomposites have been investigated by differential scanning calorimeter. The modified Avrami, Ozawa, Liu and Ziabicki equations have been applied to describe non-isothermal crystallization process. The results of Avrami analysis showed a very complicated crystallization mechanism. Although, Ozawa equation failed to provide an adequate description for non-isothermal crystallization process, Liu equation could describe it well. The data showed the crystallization rate of MDPE and nanocomposites raises with increasing cooling rate and the crystallization rate of nanocomposite is faster than that of MDPE at a given cooling rate. Ziabicki’s kinetic crystallizability index showed that clay can increase the ability of MDPE to crystallize, when it is cooled at unit cooling rate. The activation energy of samples has been evaluated by Kissinger method. The results showed that the activation energy of nanocomposite was lower than that of MDPE.

    • Author Affiliations

       

      Maryam Abareshi1 Seyed Mojtaba Zebarjad2 Elaheh K Goharshadi3 4

      1. Chemistry Department, Payame Noor University, 19395-3697 Tehran, Iran
      2. Department of Materials Science and Engineering, Engineering Faculty, Shiraz University, Shiraz, Iran
      3. Center of Nano Research, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran
      4. Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad 91775-1436, Iran

    • Dates

       
      Published
      August 2014
      Manuscript received
      11 June 2013
      Manuscript revised
      4 October 2013

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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