Effects of Inorganic ZnO Particle Doping on Crystalline Polymer Morphology and Space Charge Behavior
Abstract
:1. Introduction
2. Sample Preparation and Methods
2.1. Experimental Materials and Sample Preparation
2.2. Experimental Methods
2.2.1. PLM Test
2.2.2. DSC Test
2.2.3. SEM Test
2.2.4. AC/DC Breakdown Test
2.2.5. Space Charge Test
3. Results and Analysis
3.1. PLM Characterization Results and Analysis
3.2. DSC Characterization Results and Analysis
3.3. SEM Characterization Results and Analysis
3.4. Space Charge Test Results and Analysis
3.5. AC/DC Breakdown Test Results and Analysis
3.6. Dielectric Spectrum Test Results and Analysis
4. Conclusions
- (1)
- Based on the SEM test results, the inorganic ZnO particles were uniformly dispersed in the matrix. Based on the results of DSC and PLM crystallization characterization, the doping of the inorganic ZnO particles improved the crystallinity and crystallization rate of the polymers. In addition, the inorganic particles possessed appropriate thermal conductivity. Therefore, the melting temperatures of the polymer composites were high. The nanocomposite particle size was small, and the grain arrangement was dense and regular. The crystallinity of the micro–nanocomposites was highest.
- (2)
- Based on the AC/DC breakdown test results, the doping of the ZnO particles with different sizes generated varying effects on the composite breakdown field strength. The nano-ZnO particle doping substantially improved the AC/DC breakdown field strength. The breakdown field strength of the microcomposites was slightly lower than that of the pure LDPE. Moreover, the DC breakdown field strengths of all the samples were higher than their AC breakdown field strengths. Based on the dielectric spectrum, the dielectric constants of the nanocomposites were lower than that of the pure LDPE. However, the dielectric constants of other test composites were higher than that of the pure LDPE. Moreover, the dielectric loss of all the composites was lower than that of LDPE.
- (3)
- Based on the results of the space charge test, considerable time was required to stabilize the pure LDPE. By contrast, the steady state of the composites was reached in the first few seconds of voltage application. After 1800 s of short-circuit treatment, there were fewer residual space charges in the three composites than in the pure LDPE. The residual space charges of the nanocomposites were fewest, followed by those of the micro–nanocomposites. Thus, inorganic ZnO particle doping can restrain the accumulation of space charges, and the space charges can be released by the dielectric double-layer effect.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Name | Parameter/Model | Manufacturer |
---|---|---|
LDPE | Density: 0.910–0.925 mg/cm3 | Daqing Petrochemical (Daqing, China) |
ZnO | Particle sizes: 30 nm, 1 µm | Beijing Deke Daojin Science and Technology Co., Ltd. (Beijing, China) |
Electronic balance | YP202N | Shanghai Precision & Scientific Instrument Corporation (Shanghai, China) |
Vacuum drying oven | DZF-6020MBE | Shanghai Boxun Industry & Commerce Co., Ltd. (Shanghai, China) |
Ultrasonic cleaner | KQ5200DE | Kunshan Ultrasonic Instruments Co., Ltd. (Kunshan, China) |
Torque rheometer | Rheocord 300 | Thermo Scientific Co., Ltd. (Harbin, China) |
Scanning electron microscope | JSM-F100 | JEOL Co., Ltd. (Tokyo, Japan) |
Dielectric spectrum analyzer | DMS-2000 | Partulan Co., Ltd. (Wuhan, China) |
Plate vulcanizing machine | XLB25-D | HaimenJinma Rubber & Plastics Machinery Technology Co., Ltd. (Haimen, China) |
Differential scanning calorimeter | DSC-1 | Mettler Toledo (Zurich, Switzerland) |
Sample | Tc (°C) | Tcon (°C) | ΔTc (°C) | Tm (°C) | Xc (%) |
---|---|---|---|---|---|
LDPE | 93.67 | 102.31 | 8.64 | 109.75 | 34.90 |
N3 | 94.40 | 102.54 | 8.16 | 110.25 | 37.23 |
M3 | 95.12 | 101.14 | 6.02 | 110.60 | 35.64 |
N3M2 | 95.89 | 102.97 | 7.08 | 110.46 | 37.79 |
Sample | Breakdown Field Strength Eb/(kV·mm−1) | Numbers | Shape Parameter β |
---|---|---|---|
LDPE | 120.7 | 30 | 10.40 |
N3 | 139.8 | 30 | 11.74 |
M3 | 96.63 | 30 | 10.86 |
N3M2 | 124.6 | 30 | 13.84 |
Sample | Breakdown Field Strength Eb/(kV·mm−1) | Numbers | Shape Parameter β |
---|---|---|---|
LDPE | 297.4 | 30 | 9.372 |
N3 | 330.2 | 30 | 10.35 |
M3 | 262.7 | 30 | 11.12 |
N3M2 | 311.4 | 30 | 12.18 |
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Yu, G.; Cheng, Y. Effects of Inorganic ZnO Particle Doping on Crystalline Polymer Morphology and Space Charge Behavior. Coatings 2020, 10, 932. https://doi.org/10.3390/coatings10100932
Yu G, Cheng Y. Effects of Inorganic ZnO Particle Doping on Crystalline Polymer Morphology and Space Charge Behavior. Coatings. 2020; 10(10):932. https://doi.org/10.3390/coatings10100932
Chicago/Turabian StyleYu, Guang, and Yujia Cheng. 2020. "Effects of Inorganic ZnO Particle Doping on Crystalline Polymer Morphology and Space Charge Behavior" Coatings 10, no. 10: 932. https://doi.org/10.3390/coatings10100932