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RISS 인기검색어
- 검색키워드
- 저자 : Michel Fréchette (검색결과 2 건)
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Meng Guo,Michel Fréchette,Éric David,Nicole Raymonde Demarquette 한국전기전자재료학회 2015 Transactions on Electrical and Electronic Material Vol.16 No.2
High-energy ball milling was tested as a method for producing Ultra High Molecular Weight Polyethylene (UHMWPE)-based nanodielectrics containing 1 wt% and 5 wt% OctaIsoButylPOSS (OibPOSS). Qualitative and quantitativeevaluations were used to explore the compatibility between OibPOSS and PE. Several ball milling variables wereoptimized in a bid to achieve UHMWPE/OibPOSS nanodielectrics. The morphology, as well as the thermal and thedielectric properties of the samples, were characterized by scanning electron microscopy, thermogravimetric analysis,broadband dielectric spectroscopy, and progressive-stress breakdown tests. The results showed that (i) ball milling wasan effective method for producing UHMWPE/OibPOSS dielectric composites, but appeared ineffective in dispersingOibPOSS at the nanoscale, and (ii) the resulting UHMWPE/OibPOSS dielectric composites presented thermal anddielectric properties similar to those of neat UHMWPE.
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Study of Water Diffusion in PE-SiO2 Nanocomposites by Dielectric Spectroscopy
Hugues Couderc,Eric David,Michel Fréchette 한국전기전자재료학회 2014 Transactions on Electrical and Electronic Material Vol.15 No.6
In recent years, researchers have extensively investigated polymers filled with inorganic nanoparticles becausethese materials present improved physical properties relative to those of conventional unfilled polymers. Oxides,silica in particular, are the most commonly used inorganic particles because they possess good properties and canbe fabricated at a low cost. However, oxides are hydrophilic in nature, and this leads to the presence of water at theinterface between the nanoparticles and the polymer matrix. Due to the predominance of particle-matrix interfaces innanocomposites, the presence of water at the interlayer region can be problematic. Moreover, the hydrophobic natureof most polymers, particularly for polyolefins such as polyethylene, may make it difficult to remove this interfacialwater. In this paper, as-received and moistened samples of agglomerated nanosilica/polyethylene were dried usingan isothermal treatment at 60℃, and the efficacy of this treatment was studied using dielectric spectroscopy. TheMaxwell-Wagner-Sillars relaxation peaks were observed to shift to lower frequencies by three decades, and this waslinked to a modification of the water content, due to drying, at the interfaces between silica and polyethylene and atthe interfaces within the nanosilica agglomerates. The evolution of the extracted retardation time is explained by thenanosilica hydrophily and the free volume introduced by the nanoparticles.
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