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Roles of modified polyethylene addition and electron beam treatment on the interfacial, thermal, mechanical, and electrical properties of polyethylene/short carbon fiber composites

We report the effects of glycidyl methacrylate-grafted polyethylene (EGMA) addition and electron beam (EB)-irradiation on the interfacial, thermal, dynamic mechanical, electrical, and EMI shielding properties of polyethylene (PE) composites reinforced with polyurethane (PU)-coated short carbon fiber (SCF). For this purpose, multiple series of PE/EGMA/SCF composites with 3?10?wt% SCF loadings and 0?300?kGy?EB doses were fabricated via masterbatch melt-compounding, compression-molding, and EB-irradiation. Electron microscopic images and infrared spectra revealed that the EGMA addition and EB-irradiation enhance the interfacial adhesion between the PU-coated SCF filler and the PE matrix via specific physical and chemical interactions, respectively. Accordingly, the crystallization/melting temperatures and enthalpies of PE/EGMA/SCF composites decreased slightly with the increase in the SCF loading and the EB-irradiation dose. The residue at 600??C of the composites increased with the increment of the SCF content and/or EB dose, although the initial thermal decomposition temperature decreased slightly. The elastic storage moduli of the composites were improved noticeably by the synergistic effects of the SCF filler and EB-irradiation. The electrical conductivity and EMI shielding effectiveness of a 1?mm thick composite containing 10?wt% SCF were ?10?6 S/cm and ?10.0?dB in the X-band radio frequency range, respectively.

» Author: Soo-Yeon Kim, Eun-Ji Choi, So-Jeong Lee, Hyun Bin Kim, Seung-Hwan Oh, Young Gyu Jeong

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