Molecular dynamics of poly(vinyl alcohol)/cellulose nanofibrils nanocomposites highlighted by dielectric relaxation spectroscopy

Ghorbel, Nouha; Kallel, A.; Boufi, Sami

doi:10.1016/j.compositesa.2019.05.033

Cited by 40 publications

(32 citation statements)

References 42 publications

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“…Finally, the dielectric measurement had performed at 100°C corresponding to boiling temperature of water. The contribution of water to dc conduction is generally observed in hydrolytic polymers and nanofillers as reported in the molecular dynamics of poly(vinyl alcohol) /cellulose nanofibrils nanocomposites studied by dielectric relaxation spectroscopy 31 …”

Section: Resultsmentioning

confidence: 81%

Dielectric and interfacial properties investigation of poly(acrylonitrile‐co‐2,2,2‐trifluoroethyl methacrylate) copolymer/organomodified beidellite clay nanocomposites

et al. 2020

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The dielectric properties of fluorinated cyano copolymer poly(acrylonitrileco-2,2,2-Trifluoroethyl methacrylate) (poly[AN-co-MATRIF]), reinforced with a natural Moroccan beidellite nanoclay organomodified with cetyltrimethylammonium bromide were studied. The effect of varying nanofillers loadings (1 wt%, 2 wt%, 3 wt%, and 5 wt%) on the molecular dynamics was investigated using broadband dielectric spectroscopy from 10 −1 to 10 6 Hz and temperatures ranging between 30 C to 100 C. For the copolymer matrix, the real (ε 0

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Section: Resultsmentioning

confidence: 81%

Dielectric and interfacial properties investigation of poly(acrylonitrile‐co‐2,2,2‐trifluoroethyl methacrylate) copolymer/organomodified beidellite clay nanocomposites

et al. 2020

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“…The amount of time it needs for the dipole to balance with the system's random thermal fluctuations is known as the relaxation time, τ = 1/( ω max ), where the frequency at which the dielectric loss is maximal is ω max . It was shown that β relaxation followed Arrhenius linear behavior [ 42, 50, 51 ] while plotting the ln( τ ) versus the reciprocal of temperature:

τ ((), T) = τ_{0} e^{\frac{E_{a}}{{normalk}_{normalB} T}}

where τ 0 a pre‐exponential factor, E a the activation energy, and K B is the Boltzmann constant.…”

Section: Resultsmentioning

confidence: 99%

Impact of cellulose nanocrystals reinforcement on molecular dynamics and dielectric properties of PCL‐based polyurethane

et al. 2021

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The thermal and dielectric properties of polymer nanocomposites based on polycaprolactone diol‐based PU matrix filled with various weight fractions of cellulose nanocrystals (CNCs) (from 0 to 10 wt%) extracted from the rachis of date palm tree were investigated by differential scanning calorimetry (DSC) and broadband dielectric spectroscopy. The emphasis was on clarifying the impact of the addition of CNC nanofillers on the molecular mobility of the PU matrix. Different dielectric relaxations have been found and the corresponding activation energies have been calculated, by means of the Havriliak–Negami model after fitting the dielectric data. The outcomes were explored in terms of molecular dynamics and interfacial processes. With 2.5 wt% of CNC, the strongest adhesion between matrix and reinforcement was acquired. This research was supported by the use of DSC for thermal properties.

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“…Similar result was reported in PVOH/CNFs nanocomposites and the β relaxation was attributed to OH groups of PVOH at lower temperature (−50°C to 5°C) which is unaffected by the reinforcement effect of CNFs. [ 30 ]…”

Section: Resultsmentioning

confidence: 99%

“…That being said, for composites with nanofiller content, it is generally consensual that the development of an interfacial layers between the matrix and the nanofiller surface in nanocomposite materials greatly alters the mechanical and thermal properties as well as the dielectric characteristics. In this context, broadband dielectric spectroscopy (BDS) [ 28‐30 ] counts among the efficient instruments used to study the molecular dynamics in polymers/nanoclay composites that could not be explored by other techniques. On one hand, BDS enables us to analyze the state of dispersion of nano‐inclusions and then to inspect the morphology‐property relation in polymer through given the complex dielectric permittivity.…”

Section: Introductionmentioning

confidence: 99%

Interfacial characteristics of poly(ε‐caprolactone)‐grafted‐halloysites nanotubes bionanocomposites

Ghorbel

Raihane

Lahcini

et al. 2020

Polymer Engineering & Sci

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Dielectric and thermal characterization of nanohybrid films based on poly(ε‐caprolactone) biopolymer were investigated. Nano‐composites samples with distinct loadings of halloysite nanotubes (HNT) were prepared by in situ Ring Opening Polymerisation of ε‐caprolactone. The effect of the incorporated HNT on the molecular relaxation process and interfacial polarization of PCL was studied via broadband dielectric spectroscopy (BDS) on a frequency domain starting from 1E‐1 to 1E6 Hz and at temperatures ranging from −70°C to 50°C. The BDS measurements revealed four significant dielectric processes α‐primary relaxation attributed to glass transition, β‐secondary relaxation and two interfacial polarizations due to the semi‐crystalline character of PCL and the added HNT fillers. According to our results, the weight ratio of HNT ranging between 3% and 5% is recommended for achieving the highest performing nanocomposite that can be used in several applications.

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Molecular dynamics of poly(vinyl alcohol)/cellulose nanofibrils nanocomposites highlighted by dielectric relaxation spectroscopy

Cited by 40 publications

References 42 publications

Dielectric and interfacial properties investigation of poly(acrylonitrile‐co‐2,2,2‐trifluoroethyl methacrylate) copolymer/organomodified beidellite clay nanocomposites

Dielectric and interfacial properties investigation of poly(acrylonitrile‐co‐2,2,2‐trifluoroethyl methacrylate) copolymer/organomodified beidellite clay nanocomposites

Impact of cellulose nanocrystals reinforcement on molecular dynamics and dielectric properties of PCL‐based polyurethane

Interfacial characteristics of poly(ε‐caprolactone)‐grafted‐halloysites nanotubes bionanocomposites

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