研究目的
Investigating the enhanced positive temperature coefficient (PTC) effects of high-density Polyethylene/Graphite composites with the addition of vanadium dioxide (VO2).
研究成果
The addition of VO2 to HDPE/Gr composites resulted in enhanced double PTC effects and decreased room-temperature resistivity. The composites with 6 wt% VO2 showed the most significant improvement in PTC behavior. The study demonstrated the feasibility of improving the PTC behavior of single polymer composites by introducing a second conductive filler.
研究不足
The study focuses on the effects of VO2 addition on the PTC behavior of HDPE/Gr composites. The limitations include the specific ratios of VO2 used and the focus on a single polymer composite system.
1：Experimental Design and Method Selection:
HDPE/Gr composites were fabricated by the melt-blending method. Various contents of VO2 were added to the composites to study their effects on the PTC behavior.
2：Sample Selection and Data Sources:
HDPE pellets and Gr powders were dried and mixed with VO2 in different ratios. The samples were then processed by compression molding.
3：List of Experimental Equipment and Materials:
Haaker mixer (RM-200A), digital multimeter, ZC-36 type megger, scanning electron microscope (SEM, Hitanchi S-4800), optical microscope (OM, OLYMPUS/BX51), differential scanning calorimeter (DSC, Netzsch, DSC 214 Polyma), Discovery DHR-1 Rheometer.
4：Experimental Procedures and Operational Workflow:
The composites were prepared by melt-blending, followed by compression molding. The resistivity-temperature measurement was performed to evaluate the PTC behavior. The micromorphology, thermal properties, and electrical resistivity were characterized.
5：Data Analysis Methods:
The resistivity values were calculated, and the PTC behavior was analyzed based on the resistivity-temperature curves. The thermal properties were analyzed using DSC, and the micromorphology was observed using SEM and OM.
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Haaker mixer
RM-200A
Harbin Site Technology Company
Used for melt-blending the composites
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Digital multimeter
Used for measuring resistivity below 2×106 Ω
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Megger
ZC-36 type
Used for measuring resistivity above 2×106 Ω
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Scanning electron microscope
Hitanchi S-4800
Japan
Used for observing the micromorphology of fractured surface and thin film of samples
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Optical microscope
OLYMPUS/BX51
Japan
Used for observing the micromorphology of samples
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Differential scanning calorimeter
DSC 214 Polyma
Netzsch
Used for measuring the DSC properties of samples
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Rheometer
Discovery DHR-1
American TA Co. Ltd
Used for measuring the complex viscosity of samples
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