Effect of vinyl acetate content and silicate loading on EVA nanocomposites under shear and extensional flow

Pasanovic-Zujo, V.; Gupta, Rahul; Bhattacharya, S. N.

doi:10.1007/s00397-003-0324-9

Cited by 78 publications

(68 citation statements)

References 29 publications

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“…9 However when a polymer sample is deformed at large frequency the entanglement chains do not have time to relax, so modulus goes up. 10 Figures 8 and 11 indicate that the storage modulus of the nanocomposites containing Closite 30B with the compatibilizer is higher than that without the compatibilizer whereas not much difference is observed in the storage modulus for the nanocomposite containing Cloisite 20A depending on the presence or absence of the compatibilizer. At 1 rad/sec the storage modulus of LA30BMAH is 58% higher than that of LA20AMAH whereas for LA30B it is 28% higher than that of LA20A.…”

Section: Resultsmentioning

confidence: 99%

“…This is due to the shear thinning behaviors of the polymer nanocomposites and their pristine blend equivalent at the melted state. 10 The viscosity of the nanocomposites is higher than their pristine blend counterpart for both types of organoclay. At 1 rad/sec the viscosity of the LA30BMAH is 58% higher than that of LA20AMAH, whereas it is 29% higher in case of LA30B (as compared to LA20A).…”

Section: Resultsmentioning

confidence: 99%

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Effect of a compatibilizer on the microstructure and properties of partially biodegradable LDPE/aliphatic polyester/organoclay nanocomposites

et al. 2006

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In the present work, low density polyethylene (LDPE)/aliphatic polyester (APES)/organoclay ternary nanocomposites were prepared. In particular, the effect of a compatibilizer, polyethylene-graft-maleic anhydride (PE-g-MAH), on the morphology and properties of the ternary nanocomposites was investigated. LDPE/APES/ organoclay nanocomposites were prepared through melt intercalation method using two different kinds of organoclay. The dispersibility of silicate clays in the nanocomposites was investigated by X-ray diffraction and atomic force microscopy. The ternary nanocomposites showed higher tensile properties than the LDPE/APES blend did. The dispersibility and properties of nanocomposites containing Cloisite 30B were better than those of the nanocomposites containing Cloisite 20A. Unlike Cloisite 20A, hydroxyl groups in the intercalants in Cloisite 30B interlayer underwent a certain polar interaction with the carboxyl group of APES, favoring the intercalation of APES chains and the formation of LDPE/APES/Closite30B nanocomposites. However, the introduction of the polar hydroxyl groups also enhanced the interaction with the silicate surface at the same time, thereby rendering somewhat difficult the replacement of the surface contacts by LDPE chains, and impeding the extensive intercalation and further exfoliation of Cloisite 30B in the LDPE/APES matrix. The compatibilizer enhanced the intercalation of the polymer chain inside the clay gallery and thus improved the mechanical properties of the ternary nanocomposites. Rheological measurements of the nanocomposites via frequency sweep experiment indicated a certain interaction between the clay platelet and the polymer molecules in the melted state.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effect of a compatibilizer on the microstructure and properties of partially biodegradable LDPE/aliphatic polyester/organoclay nanocomposites

et al. 2006

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“…Only few experimental data have been collected in elongational flow (both isothermal [11][12][13][14] and nonisothermal [14][15] ). As for the rheological behavior in elongational flow, a strain hardening behavior has been observed in isothermal flow, while an increase of the melt strength accompanied by a slight decrease of the extensibility has been reported in non-isothermal elongational flow.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Properties of Polyethylene/Clay Nanocomposite Drawn Fibers

Mantia

Dintcheva

Scaffaro

et al. 2008

Macro Materials & Eng

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The influence of an elongational flow on the morphology of PE/clay nanocomposite drawn fibers was studied. An increase of the elastic modulus and the tensile strength as well as a decrease of the elongation at break are observed with increasing draw ratio. The applied elongational gradient orients the polymer chains and the clay particles along the spinning direction. When the applied flow results in the formation and the orientation of exfoliated nanoparticles, a pronounced increase of the mechanical properties is observed. The dispersed clay particles can be broken and oriented by the extensional flow, which might indicate a flow‐induced intercalated/exfoliated morphology transition.

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“…Depending on the targeted applications, a high or low permeability or selectivity to water is required. 22 It can be stated that the formation of exfoliated structure into ternary polymer-based nanocomposites (containing EVA as the second component) has been found to be dependent on the EVA type and also on the VA content and processing conditions: 19,20 intercalated-exfoliated up to exfoliated structures have been obtained as the VA content (9 to 28 wt%) increased. Poly(ethylene-co-vinyl acetate) (EVA) is a random copolymer of ethylene and vinyl acetate segments.…”

Section: Introductionmentioning

confidence: 99%

Tunable water barrier properties of EVA by clay insertion?

Wilson

Follain

Tenn

et al. 2015

Phys. Chem. Chem. Phys.

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Organo-modified Cloisite clays at varying contents were incorporated into poly(ethylene-co-vinyl acetate) (EVA) by melt blending. Nanoclay dispersion in films was first evaluated. The water transport properties were investigated by pervaporation and sorption measurements. A decrease of the water permeation flux was obtained when incorporating nanoparticles. This barrier effect is usually attributed to the increase of the diffusion pathways due to nanoclay-induced tortuosity effects. However, the diffusion coefficient was found to be dependent on water concentration, which generally reflects a plasticization effect of water. Besides, at 7 wt% of loading, an unexpected increase of water diffusivity was measured with a time-scale shift of the permeation flux. This was correlated with the formation of preferential diffusion pathways along interfacial regions due to free volumes existing between the EVA matrix and nanoclays as well as the water affinity of microfillers. As a consequence, water mass gain was found to be increased. The water-induced plasticization of sorbed water molecules was also highlighted through sorption kinetics. Eventually, some applications to these films in which water barrier behaviour is required were discussed.

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Effect of vinyl acetate content and silicate loading on EVA nanocomposites under shear and extensional flow

Cited by 78 publications

References 29 publications

Effect of a compatibilizer on the microstructure and properties of partially biodegradable LDPE/aliphatic polyester/organoclay nanocomposites

Effect of a compatibilizer on the microstructure and properties of partially biodegradable LDPE/aliphatic polyester/organoclay nanocomposites

Morphology and Properties of Polyethylene/Clay Nanocomposite Drawn Fibers

Tunable water barrier properties of EVA by clay insertion?

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