Polymer nanocomposites-major conclusions and achievements reached so far

David, Éric; Fréchette, M.F.

doi:10.1109/mei.2013.6648751

Cited by 65 publications

(26 citation statements)

References 30 publications

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“…The fitting of the dielectric permittivity to equation (S2) confirmed that all the nanocomposites exhibit, in addition to the charge fluctuation term, two relaxation modes that were not observed in neat materials. Similar behavior was reported in the literature for clay nanocomposites in general7,8,54 and clay/rubber nanocomposites specifically20,21 . The charge fluctuation term is few orders of magnitude higher in the isotropic nanocomposite.…”

supporting

confidence: 89%

“…In all the nanocomposites, both ɛ' and ɛ'' increased simultaneously compared to neat SEBS ( Figure 5 of the manuscript, Figure S7 and Figure S8 relaxation could be probably due to a MWS process from water absorbed at nanoparticles surface for instance 17,54 or to local segmental relaxation of rubber chains with reduced mobility located at polymer/clay interfaces, which is slower than the main segmental relaxation responsible for the bulk T g of the elastomer [20][21][22][23][24][25][26][27][28][29][30][31][32] . In the case of SEBS, the dynamic T g of the PEB rubbery block is in the vicinity of -40 °C, depending on the polystyrene block fraction 43,55 .…”

Section: Dielectric Propertiesmentioning

confidence: 92%

“…Moisture absorption in nanocomposites was reported several times in literature, especially for epoxybased nanocomposites containing polar groups and/or nanoparticles modified with functional groups of relatively low hydrophobicity 54,56,57 . The absorbed water could form an interfacial conductive layer between the nanoparticles and the matrix material, which gives rise to an interfacial loss process 17 .…”

Section: Dielectric Propertiesmentioning

confidence: 99%

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Interfacial molecular dynamics of styrenic block copolymer-based nanocomposites with controlled spatial distribution

Helal

Amurin

Carastan

et al. 2017

Polymer

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The dielectric properties of nanocomposites of polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) triblock copolymers containing organically modified clay nanoparticles featuring controlled spatial orientation at the nanoscale: isotropic, totally oriented and partially oriented, have been investigated and correlated with the nanocomposite morphologies. A slow dielectric relaxation process attributed to elastomer chains with reduced mobility confined at nanoparticle/polymer interphase was observed in all the nanocomposites and was found to be dependent on the orientation of nanoclay and polystyrene (PS) domains, the location of clay tactoids as well as the PS block fraction. A dielectric "interfacial" glass transition temperature T gi assigned to this characteristic relaxation was estimated to occur at temperatures ranging between 6 °C and 35 °C depending on the nanocomposite, which is much higher than the bulk rubber phase glass transition temperature, normally lower than -40 °C for the studied block copolymers. Interestingly, the highest T gi were associated with the nanocomposites featuring random or partial orientation and/or selective location of nanoparticles in the rubber phase. I) IntroductionIn nanocomposite materials, controlled orientation of certain anisotropic nanoparticles such as nanoclay 1,2 , carbon nanotubes 3 and recently boron nitride nanotubes and nanosheets 4,5 is very beneficial for a wide spectrum of applications requiring excellent mechanical, electrical and/or thermal properties.For example, in the case of mechanical reinforcement, the alignment of nanoclay was reported in several publications to induce an improved mechanical strength in the alignment direction 6 . In the specific case of nanodielectrics, more efficient electron scattering and consequently higher breakdown strength perpendicular to the nanoparticles alignment direction were reported 2,7,8,9 . Simultaneously, nanoparticle alignment was shown to reduce dielectric losses in the direction perpendicular to the main plane of the M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT3 aligned nanoparticles 2 . This controlled orientation can be obtained using a wide range of techniques 3 although spatial alignment of nanoparticles according to 2D and 3D patterns is still a challenging field of study 10 .In applications requiring tuned spatial distribution of nanoparticles, the use of block copolymers can be really an asset due to the different nanoscale morphologies these materials present 11,12,13,14,15,16 . To probe the effect of tailored morphology and orientation of such designed nanocomposites on their polymer-filler interactions and implicitly on their final performance, techniques such as broadband dielectric spectroscopy (BDS) are often required 17 .In fact, the performance of polymer nanocomposites in general is governed by the interphase region 18,19 which consists mainly of a bound layer where the motion of macromolecular chains is strongly restricted affecting several properties including dielectric and m...

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supporting

confidence: 89%

Section: Dielectric Propertiesmentioning

confidence: 92%

Section: Dielectric Propertiesmentioning

confidence: 99%

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Interfacial molecular dynamics of styrenic block copolymer-based nanocomposites with controlled spatial distribution

Helal

Amurin

Carastan

et al. 2017

Polymer

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“…For applications as insulating material in HV apparatus, the most important enhancement that is looked for with polymer nanocomposites is certainly to reach a higher DBS, a higher dielectric endurance, or both . A number of results are reported in the literature for impulse, DC, and AC breakdown strength.…”

Section: Properties Of Nanocomposites For High Voltage Insulatormentioning

confidence: 99%

A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

Ismail

Mariatti

2018

Polymer Engineering & Sci

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Thermoplastic elastomer (TPE) has gained acceptance as third generation of polymeric materials for high voltage (HV) insulators. The interesting features showed by TPEs were found to fulfill some particular requirements for HV insulations, at least for the distribution class applications, especially at light contamination environments. Introduction of nanomaterials which widely reported to give significant improvements in the electrical, mechanical, thermal and other properties of polymer has attracted attention to the synergistic properties of combining the two complementary technologies of thermoplastic elastomers and nanocomposites. In this paper, research works on various types of TPEs having promising performance as HV insulators are thoroughly reviewed. The emergence of nanocomposites in the electrical insulation field and the important properties consideration for HV insulators as well as the processing techniques of TPE nanocomposites are also discussed. Finally, some of the past and recent developments of TPE nanocomposites focusing on the electrical insulation properties are highlighted in this article. POLYM. ENG. SCI., 58:E36–E63, 2018. © 2018 Society of Plastics Engineers

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“…Nanodielectrics, defined as composites containing nanofillers (i.e., fillers with at least one dimension less than 100 nm) embedded in a dielectric matrix (e.g., a polymer), have great potential for serving this purpose as they can present superior dielectric properties compared to conventional dielectrics and dielectric microcomposites [4][5][6][7][8][9][10][11]. XLPE-based nanodielectrics containing silica nanoparticles can present improvements in several key dielectric properties over neat XLPE, such as increased dielectric breakdown strength, enhanced voltage endurance, enhanced partial-discharge resistance and reduced space charge accumulation [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Polyethylene-Based Dielectric Composites Containing Polyhedral Oligomeric SilSesquioxanes Obtained by Ball Milling

Guo¹,

Fréchette²,

David³

et al. 2015

Transactions on Electrical and Electronic Materials

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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 quantitative evaluations were used to explore the compatibility between OibPOSS and PE. Several ball milling variables were optimized in a bid to achieve UHMWPE/OibPOSS nanodielectrics. The morphology, as well as the thermal and the dielectric 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 was an effective method for producing UHMWPE/OibPOSS dielectric composites, but appeared ineffective in dispersing OibPOSS at the nanoscale, and (ii) the resulting UHMWPE/OibPOSS dielectric composites presented thermal and dielectric properties similar to those of neat UHMWPE.

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Polymer nanocomposites-major conclusions and achievements reached so far

Cited by 65 publications

References 30 publications

Interfacial molecular dynamics of styrenic block copolymer-based nanocomposites with controlled spatial distribution

Interfacial molecular dynamics of styrenic block copolymer-based nanocomposites with controlled spatial distribution

A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

Polyethylene-Based Dielectric Composites Containing Polyhedral Oligomeric SilSesquioxanes Obtained by Ball Milling

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