Crossed characterisation of polymer-layered silicate (PLS) nanocomposite morphology: TEM, X-ray diffraction, rheology and solid-state nuclear magnetic resonance measurements

Samyn, Fabienne; Bourbigot, Serge; Jama, Charafeddine; Bellayer, Séverine; Nazaré, Shonali; Hull, T. Richard; Castrovinci, A.; Fina, Alberto; Camino, Giovanni

doi:10.1016/j.eurpolymj.2008.03.021

Cited by 51 publications

(20 citation statements)

References 26 publications

(8 reference statements)

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“…Moreover, NC-L and NC-H nanocomposites have low shear thinning behavior compared to results reported elsewhere [39]. Even if the dispersion is improved in the case of NC-H compared to NC-L, no or few exfoliation has occured and the extent of intercalation is limited compared to the dispersion commonly obtained in the case of PA6 nanocomposites [40][41][42][43]. In order to evaluate the effect of the injection-molding induced dispersion of clay, the mechanical properties of the nanocomposites NC-L and NC-H were measured and compared to neat PP.…”

Section: Results and Discussion 41 Effect Of Processing Conditions mentioning

confidence: 63%

Effect of injection molding parameters on nanofillers dispersion in masterbatch based PP-clay nanocomposites

Rajesh¹,

Soulestin²,

Lacrampe³

et al. 2012

Express Polym. Lett.

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Abstract. The effect of injection molding parameters (screw rotational speed, back pressure, injec-tion flow rate and holding pressure) on the nanofiller dispersion of melt-mixed PP/clay nanocomposites was investigated. The nanocomposites containing 4 wt% clay were obtained by dilution of a PP/clay masterbatch into a PP matrix. The evaluation of the dispersion degree was obtained from dynamic rheological measurements. The storage modulus and complex viscosity exhibit significant dependence on the injection molding parameters. PP/clay nanocomposite molded using more severe injection parameters (high shear and long residence time) displays the highest storage modulus and complex viscosity, which illustrates the improved dispersion of clay platelets. This better dispersion leads to better mechanical properties particularly higher Young modulus, tensile strength and unnotched impact strength. A Taguchi analysis was used to identify the influence of individual process parameters. The major individual parameter is the injection flow rate, whose increase improves nanoclay dispersion. The combination of high back pressure and high screw rotational speed is also necessary to optimize the dispersion of clay nanoplatelets.

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Section: Results and Discussion 41 Effect Of Processing Conditions mentioning

confidence: 63%

Effect of injection molding parameters on nanofillers dispersion in masterbatch based PP-clay nanocomposites

Rajesh¹,

Soulestin²,

Lacrampe³

et al. 2012

Express Polym. Lett.

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“…Generally, to have a better view of the microstructure of nanocomposites, synergistic combinations of different characterization techniques are useful. A number of nanocomposite characterization methods are available, which include differential scanning calorimetry, thermogravimetric analysis, transmission electron microscopy, scanning electron microscopy, X-ray diffraction [117,118,145], nuclear magnetic resonance [92,155], IR spectroscopy, Raman spectroscopy [44], X-ray photoelectron spectroscopy [107], dielectric relaxation spectroscopy [111], atomic force microscopy [2,122]. In addition, some of the techniques are used to evaluate the properties of nanocomposites, like mechanical performance [136,177], barrier performance [21, 168], thermal properties [37,115].…”

Section: Characterization Of Nanocompositesmentioning

confidence: 99%

Nanocomposite Materials for Food Packaging Applications: Characterization and Safety Evaluation

Farhoodi

2015

Food Eng Rev

104

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Food packaging requires long shelf life and the monitoring of safety and quality based on international standards. In the past decade, polymer nanocomposites have emerged as a new class of food packaging materials, because they have several advantages, such as enhanced mechanical, thermal, and barrier properties. The larger surface area of nanoparticles compared with their microscale counterparts favours filler-matrix interactions and the performance of the resulting material. A new technology is accepted by the community once it has been tested for its effects on health. There have been some studies on the migration of nanoparticles from packaging material into food/food simulants during storage. It is very important to evaluate the safety of nanocomposite packaging materials used for food products. This review summarizes the characteristics and properties of nanocomposite packaging materials along with their safety problems for food consumers.

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“…The enhancement of material properties because of nanoparticles addition has usually been analysed using a combination of morphological (X-ray diffraction (XRD), transmission electron microscopy (TEM)), mechanical (tensile testing) and possibly rheological (rotational rheometry) measurements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Using 2-5% of clay, significant improvement of material properties can be reached: high elastic modulus, tensile strength, thermal resistivity, low gas and liquid permeability, reduced flammability [18] and improved rheological properties compared to the unfilled polymer matrix [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. High reinforcement due to addition of the layered silicates results from their large surface area (specific surface of montmorillonite is about 700-800 m 2 /g) [19,20].…”

Section: Introductionmentioning

confidence: 99%

Assessment of reinforcement in polymer nanocomposites using cumulative rheological parameters

Kráčalík¹

2017

Epitoanyag - JSBCM

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multiphase polymer systems, like polymer nanocomposites, exhibit complex rheological behaviour due to physical and also possibly chemical interactions between individual phases. up to now, rheology of dispersive polymer systems has been usually described by evaluation of viscosity curve (shear thinning phenomenon), storage modulus curve (formation of secondary plateau) or plotting information about dumping behaviour (e.g. van Gurp-Palmen-plot, comparison of loss factor tan δ). on the contrary to evaluation of damping behaviour, values of cot δ were calculated and called as "storage factor", analogically to loss factor. then values of storage factor were integrated over specific frequency range and called as "cumulative storage factor". in this contribution, LDPe-zno-clay nanocomposites with different dispersion grades (physical networks) have been prepared and characterized by both conventional as well as novel analysis approach. next to cumulative storage factor, further cumulative rheological parameters like cumulative complex viscosity, cumulative complex modulus or cumulative storage modulus have been introduced.

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Crossed characterisation of polymer-layered silicate (PLS) nanocomposite morphology: TEM, X-ray diffraction, rheology and solid-state nuclear magnetic resonance measurements

Cited by 51 publications

References 26 publications

Effect of injection molding parameters on nanofillers dispersion in masterbatch based PP-clay nanocomposites

Effect of injection molding parameters on nanofillers dispersion in masterbatch based PP-clay nanocomposites

Nanocomposite Materials for Food Packaging Applications: Characterization and Safety Evaluation

Assessment of reinforcement in polymer nanocomposites using cumulative rheological parameters

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