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Mechanical and Dynamic Mechanical Studies on Epoxy-Cobaltous Sulfate Polymer Hybrids

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Abstract

Cobaltous sulfate heptahydrate (CoSO4·7H2O) was incorporated as filler into diglycidyl ether of bisphenol A (DGEBA) based epoxy resin system, to prepare organic-inorganic polymer hybrid materials. Mechanical tensile studies and dynamic mechanical analysis (DMA) were carried out in order to study the static and dynamic mechanical properties of the prepared hybrid films. Mechanical tensile studies were carried out at room temperature, at a test speed of 30 mm/min. Highest tensile strength of 24.74±2.42 MPa was achieved for 4.44 wt% filler level (FL), along with an increase in the value of Young’s modulus. Storage modulus (E′), loss modulus (E″), damping factor (tan δ) were obtained by DMA studies. Glass transition temperature (Tg) was obtained for pure epoxy and filled epoxy, for various FLs varying from 0.28 wt% to 5.00 wt%. Pure epoxy showed highest Tg value compared to filled epoxy hybrids. Highest storage modulus of 9.5 GPa was obtained for 2.22 wt% FL, which also showed highest loss modulus peak. Parameters like effectiveness coefficient (C) and crosslink density were calculated from the storage modulus data. Loss modulus and tan δ curves were analyzed to study the energy dissipation properties of prepared hybrid films. Activation energy (Ea) value for glass transition was obtained from damping factor (tan δ), which showed highest Ea value of 630.5 kJmol-1, for 4.44 wt% FL. DMA studies for various FLs were carried out at different test frequencies in order to study the changes in dynamic mechanical properties of the prepared hybrid materials with respect to frequency

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Authors and Affiliations

  1. Department of Physics, Karnatak University’s Karnatak Science College, Dharwad, Karnataka, 580001, India

    Shruti S. Devangamath & Blaise Lobo

  2. Department of Chemistry, Karnatak University’s Karnatak Science College, Dharwad, Karnataka, 580001, India

    Saraswati P. Masti & Shivayogi Narasagoudr

Authors
  1. Shruti S. Devangamath
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  2. Blaise Lobo
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  3. Saraswati P. Masti
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  4. Shivayogi Narasagoudr
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Correspondence to Blaise Lobo.

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Devangamath, S.S., Lobo, B., Masti, S.P. et al. Mechanical and Dynamic Mechanical Studies on Epoxy-Cobaltous Sulfate Polymer Hybrids. Fibers Polym 19, 1490–1499 (2018). https://doi.org/10.1007/s12221-018-8031-4

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