Journal of Thermal Analysis and Calorimetry

, Volume 132, Issue 2, pp 937–945 | Cite as

Preparation of PMMA/mesoporous diatomite nanocomposites by in situ SR&NI ATRP

Enhancement of thermal stability
  • Khezrollah Khezri
  • Hassan Alijani
  • Yousef Fazli


Tailor-made poly(methyl methacrylate)/mesoporous diatomite nanocomposites were synthesized by in situ simultaneous reverse and normal initiation technique for atom transfer radical polymerization (SR&NI ATRP). Inherent characteristics of diatomite platelets were evaluated by using FTIR spectroscopy and nitrogen adsorption/desorption isotherm. Moreover, evaluation of pore size distribution and morphological studies were also performed by scanning and transmission electron microscopy. Conversion and molecular mass determinations were carried out using gas and size exclusion chromatography, respectively. Addition of 3 wt% pristine mesoporous diatomite leads to increase in conversion from 76 to 90%. Molecular mass of poly(methyl methacrylate) chains increases from 16,484 to 19,472 g mol−1 by addition of 3 wt% pristine mesoporous diatomite; however, polydispersity index values increase from 1.18 to 1.48. Appropriate agreement between theoretical and experimental molecular mass in combination with low PDI values can appropriately demonstrate the living nature of the polymerization. Increasing thermal stability of the nanocomposites is demonstrated by TGA. Differential scanning calorimetry shows an increase in glass transition temperature from 80.6 to 85.9 °C by adding 3 wt% of mesoporous diatomite platelets.


Nanocomposite PMMA Mesoporous diatomite platelets In situ SR&NI ATRP 


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Khezrollah Khezri
    • 1
  • Hassan Alijani
    • 2
  • Yousef Fazli
    • 3
  1. 1.Young Researchers and Elite Club, Central Tehran BranchIslamic Azad UniversityTehranIran
  2. 2.Department of ChemistryAmirkabir University of TechnologyTehranIran
  3. 3.Department of Chemistry, Faculty of Science, Arak BranchIslamic Azad UniversityArakIran

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