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Authors Gültner, M. ; Pötschke, P. ; Häußler, L.
Title Influence of matrix crystallinity on electrical percolation of multiwalled carbon nanotubes in polypropylene
Date 31.12.2017
Number 49767
Abstract The effect of matrix crystallinity on the electrical percolation threshold of melt mixed polymer composites containing 0.5 -5.0 wt% of multiwalled carbon nanotubes (MWCNTs) was investigated on the example of polypropylene (PP). Two different polypropylenes having the same low molecular weight and melt viscosity but different crystallinity, namely PP amorphous (PPa, 17 % crystallinity) and PP isotactic (PPi, 52 % crystallinity), were compared. In addition an industrial grade PP (49 % crystallinity) was applied. The electrical percolation was significantly lower in case of PPi (0.5 wt%) than for PPa (1.0 wt%) and the commercial PP type HP500N (between 1.0 wt% and 2.0 wt%). The comparison of PPa and PPi indicates that a selective localization of CNTs in either the amorphous or the crystalline PP phase can be assumed. The electrical volume resistivity of PPa at 3.0 wt% loading is about 1E3 Ohm·cm which equals to 1.7 wt% CNT addition in PPi. Using the measured crystallinities, calculations of local CNT contents in the amorphous phases support the assumption of selective localization within this PP phase.
Publisher AIP Conference Proceedings
Wikidata
Citation AIP Conference Proceedings 1914 (2017) ID030022
DOI http://doi.org/10.1063/1.5016709
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