Thermally Conductive Study of Polyethylene/Al 2 O 3 Composite Networks Cross-linked Pipes by Electron Beam Irradiation
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doi: 10.1007/s40242-019-0008-3
Thermally Conductive Study of Polyethylene/Al2O3 Composite Networks Cross-linked Pipes by Electron Beam Irradiation SHI Chengying1, YANG Jiayu1, LIU Yang2, WANG Yanmiao3, XU Wenge2, XU Yiquan3, HU Wei4 and LIU Baijun1* 1. Key Laboratory of High Performance Plastics, Ministry of Education, National & Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer, College of Chemistry, Jilin University, Changchun 130012, P. R. China; 2. Changchun Radiation Technology Co., Ltd., China Isotope & Radiation Corporation(CIRC), Changchun 130102, P. R. China; 3. Changchun Kinwa High Technology Co., Ltd., Changchun 130102, P. R. China; 4. Key Laboratory of Polyoxometalate Science, Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China Abstract The surface-modified Al2O3 particles were introduced into polyethylene(PE) to enhance the thermal conductivity, and PE/Al2O3 cross-linked networks with improved thermal and mechanical properties were prepared through electron beam(EB) irradiation technology. The incorporation of reactive irradiation sensitizer was useful in fabricating a high degree of cross-linking(DC) PE networks under a low irradiation dose. In the PE sample containing 2% sensitizer, DC ca.67.1% could be obtained under 60 kGy(1 kGy=1000 J/kg). EB-irradiation greatly improved the tensile stress of PE-based samples, and the tensile stresses of the samples with 0.2%—5% TMPTA(trimethylolpropane triacrylate) under 60 kGy were 24.61—27.77 MPa. All the EB-irradiated samples had higher Vicat softening temperatures than the samples without irradiation. After treatment at 120 kGy, the Vicat softening temperatures of PE-Al2O3-44/ TMPTA-2 increased from 127 °C to 130.4 °C. SEM images revealed that PE-Al2O3-50 samples with increased amount of Al2O3 particles showed a conduction “pathway,” and thermal conductivity reached 0.67 W/(m·K). Thus, high-performance pipes were successfully extruded, which could satisfy the static hydraulic blasting test and exhibit improved thermal conduction capability. Keywords Electron beam(EB)-irradiation; Cross-linked network; Thermal conductivity
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Introduction
Polyethylene(PE) is one the of the most commonly used thermoplastic resins because of its huge production and low price[1,2]. It is a leading polymeric material for gas and water pipelines and has many attractive properties over metals, such as higher chemical and corrosion resistance, lower mass, and longer service life[3,4]. Certain emerging markets(e.g., floor heating pipes and geothermal pipes) demand materials having great heat resistance and thermal conductivity[5,6]; however, general PE cannot meet these high performance requirements. Certain methods have been used to improve the heat resistance of PE, including cross-linking, which is one of the efficient methods[7]. Various methods can be used in preparing cross-linked PE(PEX) from thermoplastic PE. Generally, the four commonly used industrial approaches for preparing PEX pro
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