Effect of Nano-MgO Particles Doping on Breakdown Characteristics of Polypropylene
Abstract
:1. Introduction
2. Experimental Method and Samples Preparation
2.1. Experimental Materials and Instruments
2.2. Samples Preparation
2.3. Microstructure Characteristics and Macroscopic Test
2.3.1. PLM Test
2.3.2. DSC Test
2.3.3. Breakdown Test
3. Experimental Result and Analysis
3.1. PLM Characterization of MgO/PP Composites
3.2. DSC Characterization of MgO/PP Composites
3.3. Breakdown Test of MgO/PP Composites
3.4. Dielectric Frequency Spectra Test of MgO/PP Composite
4. Conclusions
- The crystalline morphology of different samples was observed by PLM. Nano-MgO particle doping acted as an anisotropic nucleating agent, which changed the original crystalline structure of PP. With moderate nano-MgO particle doping, the particles’ dispersion in PP matrix was better. The crystalline structure of composites was uniform and close. Additionally, the crystal size reduced, and the crystal quantity per unit space increased.
- Nano-MgO particle doping changed the ordered arrangement degree of molecular chains in PP crystallization. The PP crystallization was converted from complete large spherulitic crystal structure to a fasciculation crystal structure. The Maltese cross extinction patterns were increasingly blurred in PLM patterns. Because of the crystal nucleation centers increasing and the crystalline structure changing, the crystallization rate and the crystallinity of nano-MgO/PP composites were improved.
- According to the power frequency AC breakdown test, different mass fractions of nano-MgO particle doping improved the breakdown field strength of PP with varying degrees. Among them, when the nano-MgO particle mass fraction was 3%, the breakdown field strength of the nanocomposites was the highest and 4.7% higher than that of pure PP.
- According to the dielectric frequency spectra test, the dielectric constants of different nanocomposites were lower than that of pure PP. For all test frequencies, the loss angle tangent values of composites were higher than that of pure PP. Among them, when the nano-MgO particles mass fraction was 3%, the dielectric constant of the nano-MgO/PP composite was closest to that of pure PP.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sample | Tm (°C) | ΔTc (°C) | Tc (°C) | Xc (%) |
---|---|---|---|---|
PP | 173.8 | 15.8 | 118.3 | 46.9 |
1% | 174.6 | 14.3 | 122.0 | 47.9 |
3% | 176.2 | 12.7 | 125.3 | 49.2 |
5% | 174.2 | 13.0 | 120.1 | 48.3 |
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Yu, G.; Cheng, Y.; Wu, Z. Effect of Nano-MgO Particles Doping on Breakdown Characteristics of Polypropylene. Coatings 2020, 10, 312. https://doi.org/10.3390/coatings10040312
Yu G, Cheng Y, Wu Z. Effect of Nano-MgO Particles Doping on Breakdown Characteristics of Polypropylene. Coatings. 2020; 10(4):312. https://doi.org/10.3390/coatings10040312
Chicago/Turabian StyleYu, Guang, Yujia Cheng, and Zhicheng Wu. 2020. "Effect of Nano-MgO Particles Doping on Breakdown Characteristics of Polypropylene" Coatings 10, no. 4: 312. https://doi.org/10.3390/coatings10040312