Thermomechanical properties, phase structure, and conductivity of organic/inorganic hybrid material filled with a conductive filler

Matsumura, T.; Ochi, Mitsukazu; Nagata, Kazuya

doi:10.1002/app.12749

Cited by 15 publications

(13 citation statements)

References 13 publications

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“…This may be due to the uniform distribution of HAF particles in the presence of Al 2 O 3 , the volume effect, or both. 17,18 The presence of Al 2 O 3 may improve the filler distribution by lowering the aggregate size and consequently enhance the formation of the network; in addition, Al 2 O 3 is a conducting material. This finds further justification in SEM micrographs.…”

Section: Conductivitymentioning

confidence: 99%

Electrical and thermal studies of the distribution of carbon black in a polyester matrix in the presence of aluminum oxide

Mansour

Abd‐El‐Messieh

Abd‐El‐Nour

2008

J of Applied Polymer Sci

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The distribution of a filler in a polymeric matrix is one of the most important factors affecting the physical properties of the final product. For this reason, the main objective of this study was to introduce aluminum oxide (Al 2 O 3 ), acting as a dispersing agent, to reduce the filler-filler interaction and enhance the filler-polymer interaction. To achieve this aim, the electrical behavior of a styrenated polyester resin filled with different amounts of high-abrasion furnace black in the presence of 5% Al 2 O 3 was studied in the vicinity of the percolation threshold to evaluate the effect of the addition of Al 2 O 3 in an attempt to reduce the filler-filler interaction through the polyester matrix. At a certain concentration of carbon black, an abrupt increase was noticed through electrical conductivity, permittivity, and dielectric loss investigations. With this increase, the tendency of conductive chain formation increased through the aggregation of a carbon black particle network. The addition of 5% Al 2 O 3 improved the filler distribution by lowering the aggregate size and consequently enhanced the formation of the network. From the Arrhenius temperature dependence of the electrical conductivity, the activation energy and pre-exponential factor were obtained, and they confirmed the validity of the compensation law for the semiconducting composite systems. The composites were also analyzed by thermogravimetric analysis. Al 2 O 3 improved the thermal stability of the composites in comparison with that of a sample free of Al 2 O 3 .

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Section: Conductivitymentioning

confidence: 99%

Electrical and thermal studies of the distribution of carbon black in a polyester matrix in the presence of aluminum oxide

Mansour

Abd‐El‐Messieh

Abd‐El‐Nour

2008

J of Applied Polymer Sci

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“…In this study, we applied the so‐called double percolation technique to achieve effective improvement in thermal conductivity. This technique has been used to lower the percolation threshold of electrical conductivity in conductive polymer composites,9–11 but applications for the enhancement of thermal conductivity are very limited. In this technique, two‐phase immiscible polymer blends, where one phase is continuous, are used as the polymer matrix, and conducting fillers are selectively localized only in the continuous phase.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Thermal Diffusivity by Vertical Double Percolation Structures in Polyimide Blend Films Containing Silver Nanoparticles

Yorifuji¹,

Ando²

2010

Macro Chemistry & Physics

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The thermal diffusivity along the out‐of‐plane direction (D⟂) in polyimide (PI) blend films containing silver nanoparticles (Ag‐NPs) was investigated. PI blend films composed of a sulfur‐ and a fluorine‐containing PI were prepared via spin‐coating and thermal curing of the precursor solutions dissolving silver nitrate. Micro‐phase‐separated structures with a “vertical double percolation (VDP)” morphology were spontaneously formed in the films, in which two phases are separately aligned along the out‐of‐plane direction, and Ag‐NPs were preferentially precipitated in the sulfur‐containing PI phase. The blend films exhibited higher D⟂ values than monophase PI films containing homogeneously dispersed Ag‐NPs. These results indicate that the VDP structure functions as an effective thermal conductive pathway. magnified image

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“…Recent much research has shown that 14/28 siloxane-based organic-inorganic hybrid materials prepared by the hydrolysis-condensation of alkoxysilane compounds can be controlled at the nanometer length scale through self-assembly. For instance, the formation of a layer structure composed of alkyl chains with all-trans conformations has been reported for the products obtained by the hydrolytic condensation of alkyltrialkoxysilanes or alkyltrichlorosilanes (12)(13)(14)(15)(16)(17)(18) carbon atoms in the alkyl group) [60][61][62][63][64][65]. Those results are an aid in understanding the formation of the highly-ordered structure in water-crosslinked EPR-g-VTMS/HTMS composites.…”

Section: Absolute Configuration Of Water-crosslinked Epr-g-vtms/htms mentioning

confidence: 89%

Ethylene–propylene copolymer/ordered polysilsesquioxane nanocomposites prepared via organic acid‐ or base‐catalyzed binary silica water‐crosslinking reactions

Adachi

Hirano²,

Kasai³

et al. 2009

Polymer International

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BACKGROUND:In-situ silica sol-gel derived organic-inorganic hybrid materials, which comprise a vinyltrimethoxysilane-grafted ethylene-propylene copolymer (EPR-g-VTMS) and n-hexyltrimethoxysilane (HTMS), were successfully prepared in the presence of an organic acid and base catalyst. Benzenesulfonic acid (PhSO 3 H) and aniline (PhNH 2 ) were selected as the organic acid and base catalyst, respectively, to examine the progress and effect of progressive changes in the silane water-crosslinking reaction of EPR-g-VTMS/HTMS composites. RESULTS:The water-crosslinked EPR-g-VTMS/HTMS composites were characterized by means of attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), solid-state silicon-29 cross polarization/magic angle spinning-nuclear magnetic resonance ( 29 Si CP/MAS NMR), wide-angle X-ray scattering (WAXS), tensile strength, and field emission-scanning electron microscope (FE-SEM) measurements. CONCLUSION:These results revealed that the type of catalyst has a substantial influence on the nature of siloxane bands and eventually the physical tensile properties of the water-crosslinked EPR-g-VTMS/HTMS composites, which can be explained mainly on the knowledge of the traditional acid-and base-catalyzed silica sol-gel reaction. Moreover, the in-depth analysis for the PhNH 2 -catalyzed composites indicated the formation of ladder-type poly(n-hexyl silsesquoxane)s and the presence of the highly-ordered structure with a thickness equal to the length of two n-hexyl groups in all-trans conformation. In the present study, we demonstrated a potential for future design of highly-ordered silicate-based organic-inorganic hybrid nanocomposites.3/28

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Thermomechanical properties, phase structure, and conductivity of organic/inorganic hybrid material filled with a conductive filler

Cited by 15 publications

References 13 publications

Electrical and thermal studies of the distribution of carbon black in a polyester matrix in the presence of aluminum oxide

Electrical and thermal studies of the distribution of carbon black in a polyester matrix in the presence of aluminum oxide

Enhanced Thermal Diffusivity by Vertical Double Percolation Structures in Polyimide Blend Films Containing Silver Nanoparticles

Ethylene–propylene copolymer/ordered polysilsesquioxane nanocomposites prepared via organic acid‐ or base‐catalyzed binary silica water‐crosslinking reactions

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