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Effect of POSS ‐grafted titanium dioxide on the electrical and thermal properties of LDPE / T i O 2 polymer nanocomposite
Author(s) -
Anh Tung Tran,
Fréchette Michel,
David Éric,
Veillette René,
Moraille Patricia
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46095
Subject(s) - low density polyethylene , materials science , nanocomposite , microstructure , scanning electron microscope , titanium dioxide , composite material , polyethylene , silsesquioxane , surface modification , dielectric , polymer , chemical engineering , optoelectronics , engineering
Two types of nanocomposites have been fabricated by a ball‐milling technique. The first type consists of untreated titanium dioxide (TiO 2 ) incorporated into low‐density polyethylene (LDPE). For the second one, TiO 2 filler chemically treated with trisilanol phenyl–polyhedral oligomeric silsesquioxane (TP–POSS) as compatibilizing agent was ball‐milled with LDPE. All specimens were tested by microstructure analysis and thermal, dielectric characterization techniques. Microstructure analysis by atomic force microscopy and scanning electron microscopy show clearly an increased dispersion in presence of POSS. Scanning electron microscopy even shows the formation of a particular structure due possibly to interactions between functionalization. It was observed that the modification of the surface of TiO 2 by the POSS decreased the dielectric loss. All nanocomposites containing treated TiO 2 revealed an improvement in thermal conductivity, with the most distinct value of 19% in case of LDPE containing 5 wt % treated TiO 2 . The incorporation of TiO 2 fillers seems to reduce the dielectric breakdown strength of the nanocomposites. However, nanocomposites containing 3 and 5 wt % treated TiO 2 have exhibited a slightly enhancement in dielectric breakdown strength up to 5%. The improvement in surface resistance to partial discharge was found in all nanocomposites specimens, especially for both types of composite containing 7 wt % untreated and treated TiO 2 . © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46095.