PP composites with hybrid nanofillers: NTC phenomenon

Juha Sarlin, Kirsi Immonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


Electric conductive plastic composites have a wide potential for commercial applications, some examples are EMI shielding housings and components in automotive industry and in consumer electronics, equipments in health care sector and fuel cell components.
A phenomenon in conductive composites, especially in composites with carbon based fillers, is change of thermal induced change in conductivity as a result of morphological transitions. Usually the observed changes are practically irreversible. The phenomenon may cause increasing resistivity, usually called as “positive temperature coefficient” (PTC) or decreasing resistivity, called “negative temperature coefficient (NTC), where the new morphology created by heat treatment is more favorable for electric conductivity compared to the original state.
The existence of NTC is a sing of the lost potential in material design and processing. Therefore detailed information about the phenomenon gives us tools to develop high performance conductive materials. It this paper we discuss about NTC phenomenon observed in PP composites with CNT or in‐situ synthesized CNT‐PANi hybrid nanofiller with an amphiphilic dispersing agent.
The goal of the paper is not to present a comprehensive model of this phenomenon; we present some experimental results which may be related to polymer‐filler interactions.
These details are a part of this complicated phenomenon.
Original languageEnglish
Title of host publicationAIP Conference Proceedings
Subtitle of host publication5th International Conference on Times of Polymers (TOP) and Composites
PublisherAmerican Institute of Physics (AIP)
ISBN (Print)978-0-7354-0804-3
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication
Event5th International Conference on Times of Polymers (TOP) and Composites - Ischia, Italy
Duration: 20 Jun 201023 Jun 2010

Publication series

SeriesAIP Conference Proceedings


Conference5th International Conference on Times of Polymers (TOP) and Composites


  • Conducting polymers
  • Electrical and magnetic properties related to treatment conditions
  • Nanoparticles in polymers
  • Nanotubes
  • Organic-inorganic hybrid nanostructures
  • Reinforced polymers and polymer-based composites
  • Solids


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