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Thermal, mechanical and γ‐ray shielding properties of micro‐ and nano‐Ta 2 O 5 loaded DGEBA epoxy resin composites
Author(s) -
Prabhu Srilakshmi,
Bubbly S. G.,
Gudennavar Shivappa B.
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51289
Subject(s) - materials science , composite material , epoxy , nanocomposite , ultimate tensile strength , thermal stability , composite number , volume fraction , nano , mass fraction , dynamic mechanical analysis , izod impact strength test , electromagnetic shielding , polymer , chemical engineering , engineering
In this work, we have investigated the synergistic effect of micro‐ and nano‐Ta 2 O 5 fillers in the epoxy matrix on the thermal, mechanical, and radioprotective properties of the composites. Morphological analysis revealed uniform dispersion of fillers in the matrix. Both the thermal stability and tensile properties of matrices have enhanced in the presence of fillers. Although the nanocomposites showed significantly higher tensile strength and Youngs modulus compared to micro‐composites, the enhancement in these properties was predominant at low loadings. Dynamic mechanical analysis indicated good interfacial adhesion and positive reinforcing effect on the matrix even at higher loading (30 wt%) of nano‐Ta 2 O 5 . γ‐Ray attenuation studies performed in the energy range of 0.356–1.332 MeV revealed better γ‐ray shielding ability of nanocomposites compared to microcomposites at same weight fraction of fillers. In particular, γ‐ray attenuation at 0.356 MeV for 30 wt% nano‐Ta 2 O 5 loaded epoxy composite was enhanced by around 13% compared to the microcomposite at the same loading. Increased surface‐to‐volume ratio of nanofillers and consequent increase in matrix‐filler adhesion and radiation‐matter interaction have manifested in an overall enhancement in the thermal, mechanical, dynamic mechanical, and radiation shielding characteristics of nano‐Ta 2 O 5 /epoxy composites, proving them as promising γ‐ray shields.