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An investigation of TiO 2 nanoparticles effect on morphology, thermal, and mechanical properties of epoxy/silica composites
Author(s) -
Bayani Maryam,
Ehsani Morteza,
Khonakdar Hossein Ali,
Seyfi Javad,
HosseinAbadiGhaeni Mojtaba Hassani
Publication year - 2017
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.21558
Subject(s) - materials science , nanocomposite , dynamic mechanical analysis , composite material , nanoparticle , flexural strength , epoxy , scanning electron microscope , dispersion (optics) , thermal stability , chemical engineering , polymer , nanotechnology , physics , engineering , optics
The objective of this study was to investigate the influence of titanium oxide (TiO 2 ) nanoparticles on properties of epoxy/silica flour systems. To this end, nanocomposites containing different amounts of TiO 2 were prepared by a casting method. Thermal and mechanical properties of the nanocomposites were investigated using dynamic mechanical thermal analysis (DMTA), thermo‐gravimetrical analysis (TGA) and flexural test. Morphology of the nanocomposites i.e., dispersion and distribution of nanoparticles within the matrix was studied by scanning electron microscopy (SEM) and energy dispersive X‐ray (EDX). Based on EDX results, it was found that nanoparticles' dispersion was rather good once very low content (1 wt%) of nanoparticles was added to the system. Conversely, poor dispersion was attained in high loadings of TiO 2 due to the agglomeration of nanoparticles. SEM micrographs confirmed a brittle mode of failure for the nanocomposites by incorporation of nano TiO 2. The TGA results indicated that the thermal stability of epoxy/silica flour system in the temperature range of 300–600°C was enhanced by addition of 1 wt% TiO 2 nanoparticles while no significant improvement was observed upon further increment in the nanoparticle content. The DMTA results also exhibited that storage modulus was increased with increasing TiO 2 content, and tan δ peak shifted to higher temperatures upon addition of 5% nanoparticles. The highest flexural strength was achieved by incorporation of 5 wt% of TiO 2 ; however, beyond this limit, no further enhancement was observed in mechanical properties of the system due to the poor dispersion of nano TiO 2 within the epoxy matrix. J. VINYL ADDIT. TECHNOL., 23:E216–E221, 2017. © 2016 Society of Plastics Engineers