期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 48, 期 9, 页码 998-1008出版社
WILEY-BLACKWELL
DOI: 10.1002/polb.21988
关键词
composites; dielectric properties; mechanical properties; microstructure; polyethylene (PE); thermal properties
资金
- Council of Scientific and Industrial Research (CSIR), New Delhi, India
- Department of Science and Technology, New Delhi
Cerium oxide-filled high density polyethylene (HDPE) composites for microwave substrate applications were prepared by sigma-blend technique. The HDPE was used as the matrix and the dispersion of CeO2 in the composite was varied up to 0.5 by volume fraction, and the dielectric properties were studied at 1 MHz and microwave frequencies. The variations of thermal conductivity (k(eff)), coefficient of thermal expansion (alpha(c)) and Vicker's microhardness with the volume fraction of the filler were also measured. The relative permittivity (epsilon(eff)) and dielectric loss (tan delta) were found to increase with increase in CeO2 content. For 0.4 volume fraction loading of the ceramic, the composite had epsilon(eff) = 5.7, tan delta = 0.0068 (at 7 GHz), k(eff) = 2.6 W/m degrees C, alpha(c) = 98.5 ppm/degrees C, Vicker's microhardness of 18 kg/mm(2) and tensile strength of 14.6 MPa. Different theoretical approaches have been used to predict the effective permittivity, thermal conductivity, and coefficient of thermal expansion of composite systems and the results were compared with the experimental data. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 48: 998-1008, 2010
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