Abstract
Mesoporous diatomite nanoplatelets were used for in situ polymerization of methyl methacrylate via activators generated by electron transfer for atom transfer radical polymerization to synthesize well-defined poly (methyl methacrylate) nanocomposites. X-ray fluorescence, FTIR spectroscopy and thermogravimetric analysis (TGA) were employed for evaluating some inherent properties of pristine diatomite nanoplatelets. In addition, structural and morphological studies were also performed by nitrogen adsorption/desorption isotherm, SEM and TEM. Conversion and molecular weight determinations were carried out using gas and size exclusion chromatography respectively. Addition of 3 wt% mesoporous diatomite leads to increase of conversion from 75 to 91%. Molecular weight of PMMA chains increases from 7213 to 9878 g.mol−1 by addition of 3 wt% mesoporous diatomite; however, polydispersity index values increases from 1.15 to 1.43. Increasing thermal stability of the nanocomposites is demonstrated by TGA. Differential scanning calorimetry shows an increase in glass transition temperature from 77.3 to 82.4 °C by adding 3 wt% of mesoporous diatomite nanoplatelets.
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Fazli, Y., Khezri, K. Well-defined PMMA/diatomite nanocomposites by in situ AGET ATRP: diatomite as an appropriate replacement for clay. J Polym Res 25, 9 (2018). https://doi.org/10.1007/s10965-017-1405-2
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DOI: https://doi.org/10.1007/s10965-017-1405-2