Polymer/Clay Nanocomposites

Olad, Ali

doi:10.5772/14464

Cited by 23 publications

(13 citation statements)

References 83 publications

(42 reference statements)

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“…These results indicate the expansion of BDT interlayer spaces and thus confirm the success of the intercalation of alkylammonium ions. The broadness of the reflection peaks can be explained by the heterogeneity of charge density in BDT layers, leading to different configurations of CTA in the interlayer spaces . Based on the CTA extended length of 25.3 Å, the different interlayer spacings in 1CTA‐BDT, 3CTA‐BDT and 5CTA‐BDT may be assigned to tilted paraffin monolayer and bilayer CTA configurations (Table ) …”

Section: Resultsmentioning

confidence: 99%

Highly thermostable and crystalline poly(butylene adipate) bionanocomposites prepared by in situ polycondensation with organically modified Moroccan beidellite clay

Ilsouk

Raihane

Castelvetro

et al. 2017

Polymer International

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Bionancomposites from bioplastics and nanoclays are of great interest for packaging, agricultural and other large‐volume and niche applications due to their enhanced physical, thermal, mechanical and processing characteristics compared to the parent polymer. In this study, the biodegradable polyester poly(butylene adipate) (PBA) was synthesized by in situ polycondensation catalysed by titanium tetrabutoxide in the presence of the natural Moroccan clay beidellite (BDT). Optimization of the nanoclay exfoliation in the bionanocomposite was achieved by cation exchange of BDT with cetyltrimethylammonium bromide (CTA) and by selecting the most effective among a range of organically modified xCTA‐BDT (x = CTA/BDT equivalent feed ratio). Fourier transform infrared and 1H NMR spectral and size exclusion chromatographic analyses confirmed the effectiveness of the in situ polymerization, yielding structurally regular PBA with narrow molecular weight dispersity and 7750 < Mtrue‾n < 30 360 g mol−1, depending on the organoclay load. X‐ray diffraction and transmission electron microscopy analyses showed best clay dispersion and homogeneous distribution at 2 wt% 3CTA‐BDT. From thermogravimetric analysis and differential scanning calorimetry results the thermal stability of PBA is greatly improved even at 1 wt% 3CTA‐BDT, its glass transition temperature is nearly unaffected while crystallinity is increased by the organoclay nucleating action. These results, along with a bionanocomposite hydrophilicity only moderately higher than that of PBA, make this preparation approach particularly promising. © 2017 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Highly thermostable and crystalline poly(butylene adipate) bionanocomposites prepared by in situ polycondensation with organically modified Moroccan beidellite clay

Ilsouk

Raihane

Castelvetro

et al. 2017

Polymer International

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“…The X-ray diffraction pattern was obtained by using CuKα radiation (λ = 1.54 A°), operating at a voltage of 45 kV and under a current of 40 mA. To measure the distances between the atomic planes (i.e., d spacing) using Braggs law the following equation was used [32]:

n sans-serifλ = 2 d s i n sans-serifθ

…”

Section: Methodsmentioning

confidence: 99%

On the Injection Molding Processing Parameters of HDPE-TiO2 Nanocomposites

et al. 2017

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In recent years, the development and use of polymeric nanocomposites in creating advanced materials has expanded exponentially. A substantial amount of research has been done in order to design polymeric nanocomposites in a safe and efficient manner. In the present study, the impact of processing parameters, such as, barrel temperature, and residence time on the mechanical and thermal properties of high density polyethylene (HDPE)-TiO2 nanocomposites were investigated. Additionally, scanning electron microscopy and X-ray diffraction spectroscopy were used to analyze the dispersion, location, and phase morphology of TiO2 on the HDPE matrix. Mechanical tests revealed that tensile strength of the fabricated HDPE-TiO2 nanocomposites ranged between 22.53 and 26.30 MPa, while the Young’s modulus showed a consistent increase as the barrel temperature increased from 150 °C to 300 °C. Moreover, the thermal stability decreased as the barrel temperature increased.

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“…The enhanced filler dispersion and distribution reduces the probability of stress concentration, delaying the onset of crack formation and material failure. Furthermore, the influence of clay nanofillers on stress at break values is strongly dependent on interfacial interactions between the polymer and clay particles [75]. Strong interfacial adhesion is crucial to enhancing stress at break.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Nanofibrillated cellulose, poly(vinyl alcohol), montmorillonite clay hybrid nanocomposites with superior barrier and thermomechanical properties

et al. 2013

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Nanocomposites of poly(vinyl alcohol) (PVA), nanofibrillated cellulose (NFC), and montmorillonite (MMT) clay were prepared via solvent casting. In addition to investigating the effect of clay loading, PVA matrices crosslinked with poly(acrylic acid) (PAA) were prepared and compared with linear (noncrosslinked) PVA nanocomposites. 13C NMR and infrared spectroscopy confirmed the presence of crosslinks. Scanning electron microscopy revealed effective NFC and MMT clay dispersion throughout the nanocomposites, while X‐ray diffraction highlighted the effectiveness of PAA to encourage clay dispersion. MMT clay provided a barrier against the diffusion of water and oxygen (molecules) through the nanocomposite films. Permeability and adsorption were further reduced by crosslinking, while oxygen barrier properties were remarkably enhanced at elevated relative humidities. Thermal stability of the PVA segments was strengthened by the presence of MMT clay and crosslinks. MMT clay–reinforced PVA and NFC within the films, increasing the Young's modulus, tensile strength, and glass transition temperature. Crosslinking further enhanced the thermomechanical properties by imparting physical restraints on polymer chain segments, providing elasticity, and ductility. The hybrid films were successfully reinforced at elevated humidities, with nanocomposites displaying enhanced storage moduli and near‐complete recovery. POLYM. COMPOS., 35:1117–1131, 2014. © 2013 Society of Plastics Engineers

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Polymer/Clay Nanocomposites

Cited by 23 publications

References 83 publications

Highly thermostable and crystalline poly(butylene adipate) bionanocomposites prepared by in situ polycondensation with organically modified Moroccan beidellite clay

Highly thermostable and crystalline poly(butylene adipate) bionanocomposites prepared by in situ polycondensation with organically modified Moroccan beidellite clay

On the Injection Molding Processing Parameters of HDPE-TiO2 Nanocomposites

Nanofibrillated cellulose, poly(vinyl alcohol), montmorillonite clay hybrid nanocomposites with superior barrier and thermomechanical properties

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