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Dynamic stress relaxation behavior of nanogel filled elastomers

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Abstract

Long-time stress relaxation behavior of virgin elastomers, chemically crosslinked nanogels and nanogel filled elastomers was studied with the help of a dynamic mechanical analyzer. Sulfur crosslinked natural rubber and styrene butadiene rubber nanogels and nanocomposite gels were prepared and characterized using different methods. These gels were added in to the virgin elastomer matrix at different concentrations. Presence of crosslinked gels in elastomer matrix greatly influenced its stress relaxation behavior. The effect of draw ratio, gel loading and temperature on the stress relaxation behavior of elastomers was investigated in detail. It was found that virgin elastomers displayed extremely long-term relaxation processes and the time required to achieve equilibrium dramatically decreased with the increase in crosslink density in the case of gels. Time-temperature superposition studies revealed that stress relaxation process was accelerated and relaxation time reduced with a rise in temperature. Finally, experimental stress relaxation data were fitted with the empirical Chasset and Thirion equation with good agreement. From the fitting parameters, the characteristic relaxation time and the material parameter were estimated in order to understand the mechanism of the relaxation processes in the gels and the gel filled elastomers.

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Acknowledgement

The authors would like to thank Mr. Kamal Hussain of Dept. of Physics, IIT Kharagpur for his help in curve fitting. Suman Mitra gratefully acknowledges the financial assistance provided by the Council of Scientific and Industrial Research (CSIR), India (Award No.: 9/81(715)/08-EMR-I dated 23.10.2008).

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Authors and Affiliations

  1. Rubber Technology Centre, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India

    Suman Mitra, Santanu Chattopadhyay & Anil K. Bhowmick

  2. Indian Institute of Technology Patna, Patna, 800013, India

    Anil K. Bhowmick

Authors
  1. Suman Mitra
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  2. Santanu Chattopadhyay
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  3. Anil K. Bhowmick
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Correspondence to Anil K. Bhowmick.

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Mitra, S., Chattopadhyay, S. & Bhowmick, A.K. Dynamic stress relaxation behavior of nanogel filled elastomers. J Polym Res 18, 489–497 (2011). https://doi.org/10.1007/s10965-010-9441-1

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  • DOI: https://doi.org/10.1007/s10965-010-9441-1

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