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磁场诱导的氧化铁/聚乙烯纳米复合材料的导热性能和介电性能增强。

Enhanced Thermal Conductivity and Dielectric Properties of Iron Oxide/Polyethylene Nanocomposites Induced by a Magnetic Field.

机构信息

Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, P.R. China.

School of Applied Science, Harbin University of Science and Technology, Harbin, 150080, P.R. China.

出版信息

Sci Rep. 2017 Jun 8;7(1):3072. doi: 10.1038/s41598-017-03273-z.

DOI:10.1038/s41598-017-03273-z
PMID:28596536
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5465097/
Abstract

Iron Oxide (FeO) nanoparticles were deposited on the surface of low density polyethylene (LDPE) particles by solvothermal method. A magnetic field was introduced to the preparation of FeO/LDPE composites, and the influences of the magnetic field on thermal conductivity and dielectric properties of composites were investigated systematically. The FeO/LDPE composites treated by a vertical direction magnetic field exhibited a high thermal conductivity and a large dielectric constant at low filler loading. The enhancement of thermal conductivity and dielectric constant is attributed to the formation of the conductive chains of FeO in LDPE matrix under the action of the magnetic field, which can effectively enhance the heat flux and interfacial polarization of the FeO/LDPE composites. Moreover, the relatively low dielectric loss and low conductivity achieved are attributed to the low volume fraction of fillers and excellent compatibility between FeO and LDPE. Of particular note is the dielectric properties of FeO/LDPE composites induced by the magnetic field also retain good stability across a wide temperature range, and this contributes to the stability and lifespan of polymer capacitors. All the above-mentioned properties along with the simplicity and scalability of the preparation for the polymer nanocomposites make them promising for the electronics industry.

摘要

通过溶剂热法将氧化铁 (FeO) 纳米粒子沉积在低密度聚乙烯 (LDPE) 颗粒表面。在 FeO/LDPE 复合材料的制备过程中引入磁场，系统研究了磁场对复合材料热导率和介电性能的影响。在低填充量下，经垂直磁场处理的 FeO/LDPE 复合材料表现出较高的热导率和较大的介电常数。热导率和介电常数的增强归因于磁场作用下 LDPE 基体中 FeO 的导电链的形成，这可以有效地增强 FeO/LDPE 复合材料的热通量和界面极化。此外，相对较低的介电损耗和低电导率归因于低体积分数的填料和 FeO 与 LDPE 之间的优异相容性。值得注意的是，磁场诱导的 FeO/LDPE 复合材料的介电性能在很宽的温度范围内也保持良好的稳定性，这有助于提高聚合物电容器的稳定性和寿命。所有这些性能以及聚合物纳米复合材料制备的简单性和可扩展性使它们在电子行业具有广阔的应用前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/30861f47bf97/41598_2017_3273_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/4aa1ea7dbb30/41598_2017_3273_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/293173f7fd5f/41598_2017_3273_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/d56fff3537ef/41598_2017_3273_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/834c09a769be/41598_2017_3273_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/42a5be57d08b/41598_2017_3273_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/321418278181/41598_2017_3273_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/b3815fd81d19/41598_2017_3273_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/30861f47bf97/41598_2017_3273_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/4aa1ea7dbb30/41598_2017_3273_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/293173f7fd5f/41598_2017_3273_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/d56fff3537ef/41598_2017_3273_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/834c09a769be/41598_2017_3273_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/42a5be57d08b/41598_2017_3273_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/321418278181/41598_2017_3273_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/b3815fd81d19/41598_2017_3273_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0326/5465097/30861f47bf97/41598_2017_3273_Fig8_HTML.jpg

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