Preparation and characterization of polynorbornene/sepiolite hybrid nanocomposite films

Cho, Hun Jeong; Park, Shin-Kyu; Ha, Chang‐Sik

doi:10.1002/pi.4759

Cited by 4 publications

(3 citation statements)

References 51 publications

(59 reference statements)

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“…These groups can CONTACT Mohammad Atai m.atai@ippi.ac.ir attach to different pendant functional organosilyl groups, to form some organic characteristics to the precursor inorganic support. [5] Polymer/sepiolite nanocomposites have attracted considerable interest in recent years for exhibiting improved thermal, [6,7] mechanical, [8,9] barrier, [10] optical properties [11] and fire retardancy. [12,13] The structure and morphology of sepiolite-based nanocomposites are more controllable than other layered silicate nanocomposites because of the relatively weak interactions and small contact surfaces between the sepiolite nanorods.…”

Section: ¡1mentioning

confidence: 99%

Effect of reaction conditions on silanisation of sepiolite nanoparticles

Jalali

Taromi

Atai

et al. 2016

Journal of Experimental Nanoscience

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The study provides insights into the silanisation process of sepiolite nanoparticles. The nanoparticles were modified applying acidic and basic silanisation methods using Methacryloxypropyltrimethoxysilane (g-MPS) as coupling agent. The silanisation reaction was performed in the following conditions: (1) acidic ethanolÀwater solution with a pH of 5 and (2) basic cyclohexane with a pH of 9. The influence of the conditions on the surface chemistry of modified particles was then investigated. To characterise the surface of sepiolite nanoparticles, analytical methods such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis, X-Ray diffraction (XRD), scanning electron microscopy (SEM), and zeta potential analyses were applied. In addition, the colloidal stability of the modified nanoparticles was studied using a separation analysis. According to XRD and SEM, the basal interlayer distance of pristine sepiolite is not altered by silanisation process. TGA reveals that the grafting percentage of organosilane synthesised by basic method is approximately two times of that of acidic method. The silane coverage on the surface of the sepiolite and the per cent of hydroxyl groups covalently bound to g-MPS were calculated. Separation analysis indicates decline in dispersion stability of the modified nanoparticles in ethanol due to increment of their hydrophobicity.

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Section: ¡1mentioning

confidence: 99%

Effect of reaction conditions on silanisation of sepiolite nanoparticles

Jalali

Taromi

Atai

et al. 2016

Journal of Experimental Nanoscience

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“…[11,12,15] Likewise, polynorbornene dicarboximide/sepiolite hybrid nanocomposite films have been prepared with enhanced mechanical and dimensional stabilities, as well as upgraded oxygen barrier properties. [16] In this regard, this approach is expected to improve not only the gas barrier properties of this kind of polymers but also the ionic transport properties such as water absorption and ionic conductivity when clays functionalized with ionic groups are used.…”

Section: Introductionmentioning

confidence: 99%

Mathematical and finite element analysis estimations of the reinforcement effect on Young's modulus of polymer membrane/montmorillonite clay nanocomposites

et al. 2021

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This work attempts to estimate the effect of the reinforcement percentage on Young's modulus for membranes of polymer-clay nanocomposites (PCNs). Models tried to simulate different contents of the reinforcement for experimentally obtained PCNs with nanometric montmorillonite clays (MMT) incorporated into a polynorbornene dicarboximide matrix. The analyses were carried out modeling through discrete element method (DEM) and finite element analysis (FEA) volume fractions from 0.01 to 0.025 of elliptical MMT nano-platelets with aspect ratios = 0.2 (1000 × 500 nm) and thicknesses of 1 nm. These models were generated using as starting point the morphology and distribution of the reinforcements observed in scanning electron microscopy for experimental PCNs. Estimations were compared to predictions obtained by Rule of Mixtures and other mathematical models. Results showed that the elastic modulus of the nanocomposites significantly rises as MMT volume fraction increases. Besides, the use of DEM-FEA generated the predictions closest to the experimental values, with relative errors lower than 10%. For the other models, the errors were significantly high, even reaching 100%. This shows the importance of DEM-FEA to obtain a more accurate model of a real composite and a better estimation of its mechanical behavior.

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“…The discontinuity of the silica sheets provides increasing of the silanol groups (Si‐OH) at external surface of the sepiolite particles, which improves the interfacial interaction of sepiolite with organic solvent and polymers. As the presence of the tunnels and Si‐OH, sepiolite can dispersed well in polymer matrix and thereby improve the mechanical properties, thermal stability, flame retardancy, and barrier properties of polymers . In our previous work, we synthesized in situ modified resol nanocomposites with different clay contents from 3 to 50 wt %.…”

Section: Introductionmentioning

confidence: 99%

Characterization of nanocomposite resol resins: Individual/synergist effects of alendronic acid and sepiolite

Alkan

Kızılcan

2016

J of Applied Polymer Sci

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Alendronic acid modified resol nanocomposite resins (AA‐PFNCRs) and sepiolite modified resol nanocomposite resins (SEP‐PFNCRs) have been synthesized by in situ method in the presence of base catalyst. Additionally, the synergistic effects of alendronic acid and sepiolite clay (AA‐SEP‐PFNCR) on the resol resin have been studied. The structure, morphology, and thermal properties of these nanocomposites have been investigated by Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermogravimetric Analysis (TGA), and X‐ray Diffraction (XRD). The results demonstrated the interactions between the fillers and resol resin. Thermal properties of nanocomposite resins were improved due to alendronic acid and sepiolite. The obtained samples were also characterized morphologically by Scanning Electron Microscope (SEM). © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43807.

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Preparation and characterization of polynorbornene/sepiolite hybrid nanocomposite films

Cited by 4 publications

References 51 publications

Effect of reaction conditions on silanisation of sepiolite nanoparticles

Effect of reaction conditions on silanisation of sepiolite nanoparticles

Mathematical and finite element analysis estimations of the reinforcement effect on Young's modulus of polymer membrane/montmorillonite clay nanocomposites

Characterization of nanocomposite resol resins: Individual/synergist effects of alendronic acid and sepiolite

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