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An Automated Installation for Measuring the Complex Thermal Expansion Coefficient of Polymers by the Modulation Dilatometry Technique

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Abstract

An installation designed for measuring the relaxation component of thermal expansion, a typical feature of polymers due to the conformational mechanism of thermal expansion inherent in them, is described. The relaxation component manifests itself as a shift in the expansion variation phase relative to the temperature variations. The installation allows variations of the temperature-oscillation frequency and amplitude in the ranges of 10–3 to 10–1 Hz and 1–5 K, respectively. The expansion variation amplitudes were measured using a mechanotron with a sensitivity of at least 10–2 μm. The serviceability of the installation was demonstrated in studies of the thermal expansion of a polymer (polyvinylacetate, PVA). In these studies, a shift in the expansion–temperature phase in the polymer-vitrification region and its dependence on the temperature-oscillation frequency were recorded.

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Authors and Affiliations

  1. St. Petersburg State Polytechnical University, Russia

    Yu. I. Polikarpov, D. D. Karov, A. O. Belash & I. I. Alenichev

  2. Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia

    A. I. Slutsker

Authors
  1. Yu. I. Polikarpov
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  2. A. I. Slutsker
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  3. D. D. Karov
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  4. A. O. Belash
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  5. I. I. Alenichev
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Polikarpov, Y.I., Slutsker, A.I., Karov, D.D. et al. An Automated Installation for Measuring the Complex Thermal Expansion Coefficient of Polymers by the Modulation Dilatometry Technique. Instruments and Experimental Techniques 47, 402–408 (2004). https://doi.org/10.1023/B:INET.0000032911.79191.94

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  • DOI: https://doi.org/10.1023/B:INET.0000032911.79191.94

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