Journal of Materials Science

, Volume 39, Issue 18, pp 5673–5682 | Cite as

Sensors for chemicals based on electrically conductive immiscible HIPS/TPU blends containing carbon black

  • E. Segal
  • R. Tchoudakov
  • M. Narkis
  • A. Siegmann
Article

Abstract

Carbon Black (CB)-containing immiscible polymer blends based on high-impact polystyrene/thermoplastic polyurethane (HIPS/TPU) were studied as sensing materials for an homologous series of alcohols, including, methanol, ethanol and 1-propanol. The studied immiscible blend was designed to exhibit a double-continuity structure i.e., the CB particles form chain-like network structures within the TPU phase, which forms a continuous phase within the HIPS matrix. Extruded HIPS/TPU/CB filaments produced by a capillary rheometer process at various shear rate levels were used for the sensing experiments. All filaments displayed a selective resistance changes upon exposure to the various alcohols combined with reproducibility and recovery behaviour. An attempt is made to identify the dominant mechanisms controlling the sensing process in a CB-containing immiscible polymer blend characterized by a double-continuity structure. The distinct structure and composition of the HIPS/TPU interphase region were found to have a crucial role in the sensing mechanism, determining the selectivity of the filaments toward the studied alcohols. Additionally, the sensing performance of HIPS/TPU/CB system is compared to recent results for TPU/CB compounds, polypropylene/TPU/CB and HIPS/ethylene vinyl acetate/CB immiscible polymer blends.

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • E. Segal
    • 1
  • R. Tchoudakov
    • 1
  • M. Narkis
    • 1
  • A. Siegmann
    • 2
  1. 1.Department of Chemical Engineering, Technion—Israel Institute of TechnologyHaifaIsrael
  2. 2.Department of Materials Engineering, Technion—Israel Institute of TechnologyHaifaIsrael

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