研究目的
To explore the effect of different inorganic ZnO particles doping on the dielectrical property and crystal habit of LDPE matrix, and to investigate the impact mechanism of different inorganic nanoparticles size on internal electrical charges transport property of nano-ZnO/LDPE composite.
研究成果
The research demonstrates that nano-ZnO doping enhances the crystallinity and dielectric properties of LDPE, with optimal performance at 30 nm particle size, showing highest crystallinity (39.77%) and breakdown strengths (AC: 138.0 kV/mm, DC: 340.4 kV/mm). Conductivity increases with particle size but remains lower than pure LDPE. The study provides insights into the role of nanoparticle size in modifying polymer composites for improved electrical insulation, suggesting potential applications in high-voltage systems.
研究不足
The study is limited to specific ZnO particle sizes (9 nm, 30 nm, 100 nm, 200 nm) and a fixed mass fraction of 3 wt% in LDPE. Agglomeration effects for very small particles (e.g., 9 nm) may affect results, and the findings may not generalize to other nanoparticles or polymer matrices. Thermal breakdown effects are more pronounced in thicker samples, potentially limiting applicability to thin-film applications.
1：Experimental Design and Method Selection:
The study used melt blending to prepare nanocomposites with 3 wt% ZnO in LDPE, varying ZnO particle sizes (9 nm, 30 nm, 100 nm, 200 nm). Methods included SEM for morphology characterization, DSC for thermal analysis, AC/DC breakdown tests, and conductivity measurements under varying electric fields and temperatures.
2：Sample Selection and Data Sources:
Samples were prepared using LDPE from Da Qing Petrochemical and nano-ZnO from Beijing Decaux Science and Technology Ltd. with specified particle sizes. Data were collected from experimental tests on these composites.
3：List of Experimental Equipment and Materials:
Equipment included SEM (Hitachi S-4800), DSC (Mettler Toledo), rheometer, platen press, DC high voltage source, picoammeters, and vacuum drying oven. Materials included LDPE, nano-ZnO particles, 1010 antioxygen, and cable compound.
4：Experimental Procedures and Operational Workflow:
ZnO and LDPE were melt-blended at 140°C for 20 minutes, pressed into films of varying thicknesses (65±10 μm, 130±10 μm, 195±10 μm, 200 μm). SEM was used to observe ZnO morphology. DSC was performed under nitrogen flow with heating/cooling rates of 10°C/min. Breakdown tests used a voltage ramp of 1 kV/s, with samples pretreated in a vacuum oven at 80°C for 24 hours. Conductivity tests measured current density and conductivity under different electric fields and temperatures.
5：Data Analysis Methods:
Weibull distribution analysis using MINITAB software for breakdown data, and direct calculation for crystallinity and conductivity based on experimental measurements.
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