Effect of acrylic copolymer and terpolymer composition on the properties of in-situ polymer/silica hybrid nanocomposites |
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Authors: | S Patel A Bandyopadhyay V Vijayabaskar Anil K Bhowmick |
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Affiliation: | (1) Rubber Technology Centre, Indian Institute of Technology, Kharagpur, 721302, India;(2) Present address: Department of Polymer Science & Technology, University of Calcutta, 92, A.P.C. Road, Calcutta, 700009, India |
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Abstract: | Acrylic copolymer- and 5% acrylic acid (AA) modified terpolymer-silica hybrid nanocomposites were synthesized by free radical
bulk polymerization of ethyl acrylate (EA), butyl acrylate (BA) and acrylic acid (AA) with simultaneous generation of silica
from tetraethoxysilane by sol-gel reaction. The pure polymers were analyzed by using Fourier Transform infrared (FTIR) spectroscopy
and solid state nuclear magnetic resonance (NMR) spectroscopy. The hybrid samples were characterized by scanning electron
microscopy (SEM), FTIR spectroscopy, NMR spectroscopy, dynamic mechanical, mechanical and thermal properties. SEM images confirmed
the presence of nanosilica particles within the polymer matrices, whose dispersion and particle size distribution and visual
appearance were dependent on the relative polarity (hydrophilicity) of the polymer matrices and the concentration of the filler.
There was no evidence of strong chemical interaction between the polymers and the dispersed silica phase, as confirmed from
the FTIR results. Terpolymer-silica hybrids demonstrated superior mechanical properties compared to the copolymer-silica hybrids.
They also showed higher dynamic storage modulus and positive shift in the loss tangent peaks. The thermal stability of the
nanocomposites was marginally higher which was possibly due to the dipolar interaction at the organic-inorganic interface. |
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