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

Enhancement of thermal stability

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Abstract

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.

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Authors and Affiliations

  1. Young Researchers and Elite Club, Central Tehran Branch, Islamic Azad University, Tehran, Iran

    Khezrollah Khezri

  2. Department of Chemistry, Amirkabir University of Technology, Tehran, Iran

    Hassan Alijani

  3. Department of Chemistry, Faculty of Science, Arak Branch, Islamic Azad University, Arak, Iran

    Yousef Fazli

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  1. Khezrollah Khezri
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  2. Hassan Alijani
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  3. Yousef Fazli
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Correspondence to Yousef Fazli.

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Khezri, K., Alijani, H. & Fazli, Y. Preparation of PMMA/mesoporous diatomite nanocomposites by in situ SR&NI ATRP. J Therm Anal Calorim 132, 937–945 (2018). https://doi.org/10.1007/s10973-018-7011-7

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  • DOI: https://doi.org/10.1007/s10973-018-7011-7

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