Electrical performance of carbon-based hybrid filler systems in thermoplastic polymer blends
Seppälä, Pasi (2017)
Seppälä, Pasi
2017
Materiaalitekniikka
Teknisten tieteiden tiedekunta - Faculty of Engineering Sciences
This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited.
Hyväksymispäivämäärä
2017-08-16
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tty-201708241756
https://urn.fi/URN:NBN:fi:tty-201708241756
Tiivistelmä
Accumulation of static electricity causes danger in applications where non-conductive materials are subjected to repetitive contact with charged particles. Charged object upon contact with a conductive surface causes an electric shock, which can be destructive. By using materials with different electrical conductivities, protection against various electrical phenomena can be obtained. Well conductive materials are suitable to protect sensitive devices from electromagnetic interference, while moderately conductive materials provide more controlled charge transfer.
This thesis aimed to review the factors that contribute to the formation of electrical properties in thermoplastic polymeric blends, and to find out if hybrid filler systems could be applied for more delicate tailoring of the final properties. Besides the focus on electrical properties, other crucial elements were briefly considered. In the experimental part 6 different fillers were compounded and tested in two polymeric blends with fixed constitutions. The fillers consist of carbon's allotropes, e.g. carbon black. The electrical percolation curves for the materials were formed with surface resistance measurements from extruded and injection moulded specimens. Further analysis was carried out with differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and thermoforming. The filler contents were verified with ash content measurements from the produced compounds.
This thesis aimed to review the factors that contribute to the formation of electrical properties in thermoplastic polymeric blends, and to find out if hybrid filler systems could be applied for more delicate tailoring of the final properties. Besides the focus on electrical properties, other crucial elements were briefly considered. In the experimental part 6 different fillers were compounded and tested in two polymeric blends with fixed constitutions. The fillers consist of carbon's allotropes, e.g. carbon black. The electrical percolation curves for the materials were formed with surface resistance measurements from extruded and injection moulded specimens. Further analysis was carried out with differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and thermoforming. The filler contents were verified with ash content measurements from the produced compounds.