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Strain rate sensitivity of toughened epoxy

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Abstract

The high strain rate behaviour of toughened epoxy is explored under compressive loadings. A cycloaliphatic epoxy was toughened using different types of preformed fillers: epoxy-coated elastomeric poly(dimethylsiloxane) (CSR) and thermoplastic polystyrene microspheres. The toughening ability of the fillers was quantified in terms of improvement in izod impact strength. Our studies revealed that the disadvantages associated with liquid rubber toughening, especially lowering of the glass transition temperature (T g) and storage modulus, could be overcome by using poly(dimethylsiloxane) (PDMS) microspheres. The izod impact strength increased by 33 % upon addition of 3 % w/w amino-polystyrene microspheres, and ~125 % upon introduction of CSR (5 % w/w). High strain rate studies performed using split Hopkinson pressure bar revealed that the compressive strength of epoxy and the toughened compositions were significantly enhanced at high strain rates (~103 s−1) compared with that at quasi-static loading conditions (~10−1 s−1). The effect of filler type on the strain rate sensitivity of the base polymer was established by comparing the property enhancement factor (PEF). Although introduction of elastomeric microspheres led to a lower compressive strength of epoxy, the PEF associated with the rubber-toughened composites was substantially higher than that with the thermoplastic-toughened analogous compositions, which was attributed to the viscous energy absorption in PDMS resulting from the dynamic rubber to glass transition at high strain rates.

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Acknowledgments

The authors are thankful to the Director, CFEES, and the Director, TBRL, for taking keen interest and providing the laboratory facilities.

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Authors and Affiliations

  1. Centre for Fire, Explosive and Environment Safety, DRDO, Timarpur, Delhi, 110054, India

    Saurabh Chaudhary & Prasun Kumar Roy

  2. Department of Applied Chemistry and Polymer Technology, Delhi Technological University, Delhi, 110042, India

    Saurabh Chaudhary, Nahid Iqbal & Devendra Kumar

  3. Terminal Ballistics Research Laboratory, DRDO, Chandigarh, 160 030, India

    Vikas Mangla

Authors
  1. Saurabh Chaudhary
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  2. Nahid Iqbal
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  3. Vikas Mangla
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  4. Devendra Kumar
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  5. Prasun Kumar Roy
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Correspondence to Prasun Kumar Roy.

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Chaudhary, S., Iqbal, N., Mangla, V. et al. Strain rate sensitivity of toughened epoxy. Iran Polym J 24, 871–881 (2015). https://doi.org/10.1007/s13726-015-0375-7

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  • DOI: https://doi.org/10.1007/s13726-015-0375-7

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