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Ponnuruthiyil Shaji, Akhil; Shaik, Mahammad Ali; Golla, Brahma Raju
Journal of applied polymer science, 06/2019, Volume: 136, Issue: 23Journal Article
ABSTRACT Almost fully dense high‐density polyethylene (HDPE) reinforced with submicron‐sized titanium dioxide (TiO 2 ) ceramic filler (up to 40 vol %) was fabricated using compression molding. More than 98.5% ρ th (theoretical density) could be obtained for all the HDPE compositions and its measured density varied between 0.94 and 2.25 g cc −1 . The hardness of HDPE increased considerably from 32.6 to 69 MPa (i.e., by two times) with the addition of 40 vol % TiO 2 . The compression strength (19.03–34.16 MPa) and modulus of elasticity (0.49–1.05 GPa) of HDPE were also found to increase with the addition of TiO 2 filler. However, the HDPE exhibited good ductility (59% strain) up to 20 vol % TiO 2 and it was reduced with the further addition of TiO 2 . The strain decreased drastically to 7.6% for HDPE‐40 vol % TiO 2 . Addition of TiO 2 filler leads to a considerable decrease in wear rate and coefficient of friction (COF). The wear studies revealed that the HDPE‐40% TiO 2 composite exhibited a low wear rate of 1.82 × 10 −5 mm 3 N m −1 and COF of 0.13. The dielectric constant of HDPE (at 10 kHz) was also considerably increased from 5.31 to 20.02 with the addition of TiO 2 up to 40 vol %. Achievement of such high dielectric constant for HDPE materials is the highest ever reported for HDPE. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47610.
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