High‐resolution solid‐state NMR investigation of the filler–rubber interaction: 2. High‐speed [1H] magic‐angle spinning NMR spectroscopy in carbon‐black‐filled polybutadiene

Mansencal, Rachel; Haidar, B.; Vidal, A.; Delmotte, Luc; Chezeau, J.M.

doi:10.1002/pi.640.abs

Cited by 9 publications

(10 citation statements)

References 5 publications

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“…In fact, polymer chain immobility has been thought of as one of the reasons for enhancements in the mechanical properties of polymer nanocomposites. Laboratory experiments as well as molecular dynamics simulations have conjectured that the mobility of polymer chains is hindered when nanoparticles are dispersed in a polymer [17,27,28,29]. As discussed in section 3.1 above, the interactions between polymer chains and nanoparticle lead to the formation of a highly immobile polymer nanolayer close to the nanoparticle surface due to strong bonding of the charged particle surface and the polymer chains [17].…”

Section: Occurrence Of Lower Permittivitymentioning

confidence: 99%

Dielectric properties of epoxy nanocomposites

Singha

Thomas

2008

IEEE Trans. Dielect. Electr. Insul.

601

342

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The dielectric properties of epoxy nanocomposites with insulating nano-fillers, viz., TiO 2 , ZnO and Al 2 O 3 were investigated at low filler concentrations by weight. Epoxy nanocomposite samples with a good dispersion of nanoparticles in the epoxy matrix were prepared and experiments were performed to measure the dielectric permittivity and tan delta (400 Hz-1 MHz), dc volume resistivity and ac dielectric strength. At very low nanoparticle loadings, results demonstrate some interesting dielectric behaviors for nanocomposites and some of the electrical properties are found to be unique and advantageous for use in several existing and potential electrical systems. The nanocomposite dielectric properties are analyzed in detail with respect to different experimental parameters like frequency (for permittivity/tan delta), filler size, filler concentration and filler permittivity. In addition, epoxy microcomposites for the same systems were synthesized and their dielectric properties were compared to the results already obtained for nanocomposites. The interesting dielectric characteristics for epoxy based nanodielectric systems are attributed to the large volume fraction of interfaces in the bulk of the material and the ensuing interactions between the charged nanoparticle surface and the epoxy chains.

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Section: Occurrence Of Lower Permittivitymentioning

confidence: 99%

Dielectric properties of epoxy nanocomposites

Singha

Thomas

2008

IEEE Trans. Dielect. Electr. Insul.

601

342

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“…Research on the mechanical behaviors in polymer nanocomposites has shown significant improvements in several properties [24]. Limited laboratory experiments [37,38] as well as molecular dynamics simulations [39,40] have conjectured that these enhancements in the mechanical characteristics are due to restrictions in the mobility of polymer chains in the nanocomposite caused by the strong interactions of the polymer chains with the highly charged nano-fillers. Depending on the interaction mechanism of the polymer with the nanoparticle, an interfacial polymer nanolayer is reported to form on the nanoparticle surface which is highly immobile due to the strong bonding of the polymer chains and the particle surface [37].…”

Section: Lower Effective Permittivitymentioning

confidence: 99%

Permittivity and tan delta characteristics of epoxy nanocomposites in the frequency range of 1 MHz-1 GHz

Singha

Thomas

2008

IEEE Trans. Dielect. Electr. Insul.

167

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To achieve a compact and reliable design of electrical equipment for the present day requirements, there is an urgent need for better and smart insulating materials and in this respect, the reported enhancements in dielectric properties obtained for polymer nanocomposites seems to be very encouraging. To further understand the dielectric behavior of polymer nanocomposites, this experimental work reports the trends of dielectric permittivities and tan delta (loss tangent) of epoxy nanocomposites with single nano-fillers of Al 2 O 3 and TiO 2 at low filler concentrations (0.1%, 0.5%, 1% & 5%) over a frequency range of 1 MHz-1 GHz. Results show that the nanocomposites demonstrate some very different dielectric characteristics when compared to those for polymer microcomposites. Unlike the usual expectations of increasing permittivity with increasing filler concentration in polymer microcomposites, it has been seen that up to a certain nano-filler concentration and depending on the permittivity of the nano-filler, the permittivities of the epoxy nanocomposites are less than that of the unfilled epoxy at all the measured frequencies. This suggests that there is a very strong dependence of the filler concentration and nano-filler permittivity on the final permittivity of the nanocomposites at all these frequencies. But, in the case of tan delta behavior in nanocomposites, significant effects of filler concentrations were not observed with both Al 2 O 3 and TiO 2 fillers. Tan delta values in nanocomposites with Al 2 O 3 fillers are found to be marginally lower at all filler concentrations when compared with the value for unfilled epoxy. But, in TiO 2-epoxy nanocomposites, although the variations in tan delta are not significant with respect to unfilled epoxy, some interesting trends are observed with respect to the frequencies of measurement.

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“…BdR is considered to be crucial for the processing, rheology, and storage stability of compounds and the mechanical properties of vulcanizates . It may exhibit a T g the same as or very slightly higher than that of the matrix …”

Section: Introductionmentioning

confidence: 99%

Dynamics heterogeneity in silica‐filled nitrile butadiene rubber

Song

Jia

et al. 2018

J of Applied Polymer Sci

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Nanoparticles significantly reinforce rubbers, but their influence on polymer dynamics is far from being understood. Here a comparison study of polymer dynamics in silica‐filled nitrile butadiene rubber compounds and their bound rubber in extracted filler gels is performed. Both the compounds and filler gels contain glassy, restricted, and mobile rubber fractions. The restricted fraction detected by broadband dielectric spectra exhibits a subsegmental relaxation that is two to four orders of magnitude slower than the segmental dynamics of the mobile phase. It is significant that the extractable fraction interacts with both the restricted and mobile fractions in the bound rubber, thus improving the activation energy of restricted relaxation and reducing the fragility of segmental relaxation in the mobile fractions. Meanwhile, the influences of loading, surface nature, and specific surface area of the silica on the dynamics heterogeneity are investigated. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46223.

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High‐resolution solid‐state NMR investigation of the filler–rubber interaction: 2. High‐speed [1H] magic‐angle spinning NMR spectroscopy in carbon‐black‐filled polybutadiene

Cited by 9 publications

References 5 publications

Dielectric properties of epoxy nanocomposites

Dielectric properties of epoxy nanocomposites

Permittivity and tan delta characteristics of epoxy nanocomposites in the frequency range of 1 MHz-1 GHz

Dynamics heterogeneity in silica‐filled nitrile butadiene rubber

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