Preparation of low-density polyethylene/low-temperature expandable graphite composites with high thermal conductivity by an in situ expansion melt blending process |
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| Affiliation: | 1. School of Liberal Studies and Education, Navrachana University, Vadodara-391410, Gujarat, India;2. Department of Sciences, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Coimbatore, India.;1. Luxembourg Institute of Science and Technology (LIST), Materials Research and Technology Department (MRT), 5 rue Bommel, 4940 Hautcharage, Luxembourg;2. Université de Lorraine, LMOPS E.A. 4423, 57070 Metz, France;3. C2MA, Ecole des mines d''Alès, 6 avenue de Clavières, 30319 Alès, France;1. Liaoning Provincial Key Laboratory for Synthesis and Preparation of Special Functional Materials, Shenyang University of Chemical Technology, Shenyang 110142, China;2. Materials Science and Engineering Area, Universidad Rey Juan Carlos, Calle Tulipan, s/n, 28933 Móstoles, Spain;3. IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain |
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| Abstract: | A facile strategy with the advantages of low cost and ease of mass production was presented to prepare low-density polyethylene (LDPE)/low-temperature expandable graphite (LTEG) composites with relatively high thermal conductivity by an in situ expansion melt blending process. LTEGs were expanded and delaminated into graphite multi-layers and graphite nanoplatelets during processing which synergistically created more thermo-conducting paths in the composites and hence led to great improvements in thermal conductivity. Thermal conductivity of the composite with 60 wt% of LTEG loading was increased by 23 times as compared to the pure LDPE, increasing from 0.47 to 11.28 W/mK. The incorporation of LTEG decreased the melting temperature and the degree of crystallinity of LDPE. Percolation threshold of both the electrical conductivity and rheological measurements was observed at about 8 vol% of LTEG loading. Moreover, the LDPE/LTEG composites showed better thermal stability compared to the pure LDPE. |
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| Keywords: | Low-temperature expandable graphite Low density polyethylene Thermal conductivity Melt blending |
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