聚乙烯导热复合材料的电子束辐照改性

doi:10.11944/j.issn.1000-0518.2020.08.200050

摘要/Abstract

摘要： 将低密度聚乙烯(LDPE)、氧化铝(Al₂O₃)和纳米二氧化硅(SiO₂)进行熔融共混,再通过电子束辐照对得到的材料进行改性,得到了同时具有高导热性能和力学性能的复合材料(PE-Al-Si)。当纳米SiO₂的质量分数为1%,电子束辐照剂量为120 kGy时,与不含SiO₂的复合材料(PE-Al)相比,PE-Al-Si的导热系数达到了0.759 W/(m·K),提高了22%。另外,PE-Al-Si的拉伸强度比PE-Al提高了17%。证明SiO₂不仅可以改善复合材料的力学性能,同时还提高了辐照效率及复合材料的导热性能。

关键词: 聚乙烯, 电子束辐照, 纳米二氧化硅, 导热

Abstract: In this study, the composites (PE-Al-Si) with high thermal conductivity and mechanical properties were obtained by compounding low density polyethylene (LDPE), alumina (Al₂O₃) and SiO₂ nanoparticles through melt blending, and then further modification through electron beam radiation. When the mass fraction of SiO₂ nanoparticles is 1% and the electron beam radiation (EB) dose is 120 kGy, the thermal conductivity of PE-Al-Si increases from 0.624 W/(m稫) to 0.759 W/(m稫), which is 22% increase compared with the composites without SiO₂ (PE-Al). The tensile strength of PE-Al-Si is increased by 17% compared with that of PE-Al. The results prove that SiO₂improves the mechanical properties, the radiation efficiency and the thermal conductivity of the composites.

Key words: polyethylene, electron beam radiation, SiO₂ nanoparticles, thermal conductivity

段金炽, 戚云霞, 石埕莹, 赵麒, 刘佰军, 孙昭艳, 徐义全, 呼微, 张袅娜. 聚乙烯导热复合材料的电子束辐照改性[J]. 应用化学, 2020, 37(8): 896-903.

DUAN Jinchi, QI Yunxia, SHI Chengying, ZHAO Qi, LIU Baijun, SUN Zhaoyan, XU Yiquan, HU Wei, ZHANG Niaona. Electron Beam Radiation Modification of Polyethylene Thermal Conductive Composites[J]. Chinese Journal of Applied Chemistry, 2020, 37(8): 896-903.

参考文献

[1] Anithambigai P,Shanmugan S,Mutharasu D,et al. Study on Thermal Performance of High Power LED Employing Aluminum Filled Epoxy Composite as Thermal Interface Material[J]. Microelectron J,2014,45(12):1726-1733.
[2] Henry A,Chen G. Anomalous Heat Conduction in Polyethylene Chains:Theory and Molecular Dynamics Simulations[J]. Phys Rev B,2009,79(14):144305.
[3] Fan J,Xu S. Aluminum Oxide Particles/Silicon Carbide Whiskers' Synergistic Effect on Thermal Conductivity of High-Density Polyethylene Composites[J]. Iran Polym J,2018,27(5):339-347.
[4] Ouyang Y,Hou G,Bai L,et al. Constructing Continuous Networks by Branched Alumina for Enhanced Thermal Conductivity of Polymer Composites[J]. Compos Sci Technol,2018,165:307-313.
[5] Evgin T,Koca H D,Horny N,et al. Effect of Aspect Ratio on Thermal Conductivity of High Density Polyethylene/Multi-Walled Carbon Nanotubes Nanocomposites[J]. Compos Part A:Appl Sci Manuf,2016,82:208-213.
[6] Pedrazzoli D,Pegoretti A,Thomann R,et al. Toughening Linear Low-Density Polyethylene with Halloysite Nanotubes[J]. Polym Composit,2015,36(5):869-883.
[7] Zhang Y,Yu J,Zhou C,et al. Preparation, Morphology, and Adhesive and Mechanical Properties of Ultrahigh-Molecular-Weight Polyethylene/SiO₂ Nanocomposite Fibers[J]. Polym Compos,2010,31(4):684-690.
[8] Sahyoun J,Crepet A,Gouanve F,et al. Diffusion Mechanism of Byproducts Resulting from the Peroxide Crosslinking of Polyethylene[J]. J Appl Polym Sci,2017,134(9):.
[9] Liu D,Pourrahimi A M,Pallon L K H,et al. Interactions Between a Phenolic Antioxidant, Moisture, Peroxide and Crosslinking By-Products with Metal Oxide Nanoparticles in Branched Polyethylene[J]. Polym Degrad Stab,2016,125:21-32.
[10] Kabanov V,Feldman V,Ershov B,et al. Radiation Chemistry of Polymers[J]. High Energy Chem,2009,43(1):1-18.
[11] Kolanthai E,Bose S,Bhagyashree K S,et al. Graphene Scavenges Free Radicals to Synergistically Enhance Structural Properties in a Gamma-Irradiated Polyethylene Composite Through Enhanced Interfacial Interactions[J]. Phys Chem Chem Phys,2015,17(35):22900-22910.
[12] Chen P Y,Chen C C,Harmon J P,et al. The Effect of Gamma Radiation on Hardness Evolution in High Density Polyethylene at Elevated Temperatures[J]. Mater Chem Phys,2014,146(3):369-373.
[13] Chen Y,Yue W,Bian Z,et al. Preparation and Properties of KH550-Al₂O₃/PI-EP Nanocomposite Material[J]. Iran Polym J,2013,22(5):377-383.
[14] Anithambigai P,Chakravarthii M K D,Mutharasu D,et al. Potential Thermally Conductive Alumina Filled Epoxy Composite for Thermal Management of High Power LEDs[J]. J Mater Sci:Mater Electron,2017,28(1):856-867.
[15] Narkis M,Raiter I,Shkolnik S,et al. Structure and Tensile Behavior of Irradiation- and Peroxide-Crosslinked Polyethylenes[J]. J Macromol Sci Phys,1987,26(1):37-58.
[16] Stephen H. Foulger. Electrical Properties of Composites in the Vicinity of the Percolation Threshold[J]. J Appl Polym Sci,1999,72(12):1573-1582.
[17] Lai S K. Interface Trap Generation in Silicon Dioxide When Electrons are Captured by Trapped Holes[J]. J Appl Phys,54(5):2540-2546.
[18] DiMaria D J. Correlation of Trap Creation with Electron Heating in Silicon Dioxide[J]. Appl Phys Lett,1987,51(9):655-657.
[19] Zhang J,Li C,Yu C,et al. Large Improvement of Thermal Transport and Mechanical Performance of Polyvinyl Alcohol Composites Based on Interface Enhanced by SiO₂ Nanoparticle-Modified-Hexagonal Boron Nitride[J]. Compos Sci Technol,2019,169:167-175.
[20] Kochetov R,Andritsch T,Lafont U,et al. Thermal Conductivity of Nano-Filled Epoxy Systems[Z]. Conference on Electrical Insulation and Dielectric Phenomena,2009:658-661.
[21] Stelescu M D,Manaila E,Craciun G,et al. New Green Polymeric Composites Based on Hemp and Natural Rubber Processed by Electron Beam Irradiation[J]. Sci World J,2014,2014:1-13.
[22] Sener A A,Demirhan E. The Investigation of Using Magnesium Hydroxide as a Flame Retardant in the Cable Insulation Material by Cross-Linked Polyethylene[J]. Mater Des,2008,29(7):1376-1379.
[23] Mishra A K,Luyt A S. Effect of Sol-Gel Derived Nano-Silica and Organic Peroxide on the Thermal and Mechanical Properties of Low-Density Polyethylene/Wood Flour Composites[J]. Polym Degrad Stab,2008,93(1):1-8.
[24] Bikiaris D N,Vassiliou A,Pavlidou E,et al. Compatibilisation Effect of PP-g-MA Copolymer on iPP/SiO₂Nanocomposites Prepared by Melt Mixing[J]. Eur Polym J,2005,41(9):1965-1978.
[25] Dadbin S,Frounchi M,Saeid M H,et al. Molecular Structure and Physical Properties of E-Beam Crosslinked Low-Density Polyethylene for Wire and Cable Insulation Applications[J]. J Appl Polym Sci,2002,86(8):1959-1969.
[26] Ziaie F,Borhani M,Mirjalili G,et al. Effect of Crystallinity on Electrical Properties of Electron Beam Irradiated LDPE and HDPE[J]. Radiat Phys Chem,2007,76(11/12):1684-1687.
[27] Sharif J,Aziz S H S A,Hashim K. Radiation Effects on LDPE/EVA Blends[J]. Radiat Phys Chem,2000,58(2):191-195.
[28] Hassan M A. Effect of Incorporation of Butyl Acrylate-Iron Chelate Resin on the Flammability Properties of Mg (OH)₂-LDPE Compositions[J]. Polym-Plast Technol Eng,2005,43(5):1487-1501.
[29] Xiong L,Xiong D,Jin J. Study on Tribological Properties of Irradiated Crosslinking UHMWPE Nano-Composite[J]. J Bionic Eng,2009,6(1):7-13.
[30] Zhang Y,Yu J,Chen L,et al. Surface Modification of Ultrahigh-Molecular-Weight Polyethylene Fibers with Coupling Agent During Extraction Process[J]. J Macromol Sci,2009,48(2):391-404.