Morphology and properties of layered silicate-polyethylene nanocomposite blown films

Yang, Zhong; Kée, D. De

doi:10.1002/pen.20306

Cited by 42 publications

(47 citation statements)

References 25 publications

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“…In the existing literature, contradictory results are reported on this point. In fact, consistently with our observations, some authors reported an increase of the intercalation level with the clay loading [2,11,27], while other authors observed an opposite trend [33,34].…”

Section: X-ray Diffraction Measurementssupporting

confidence: 92%

“…In order to obtain a good chemical affinity between polyethylene and clay, the use of organoclay with high hydrophobicity is recommended [8,9], and some researchers tried to use different organo-modifiers for clay functionalization [10][11][12]. Even if a number of papers have been published on the mechanical properties of melt-compounded PEclay nanocomposites [4,6,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] , only Ranade et al reported on their response to tensile creep [23].…”

Section: Introductionmentioning

confidence: 99%

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Tensile mechanical response of polyethylene – clay nanocomposites

Pegoretti

Dorigato²,

Penati³

2007

Express Polym. Lett.

101

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Abstract. In this work we report on the microstructural and the mechanical characteristics of high density polyethylene (HDPE)-clay nanocomposites, with particular attention to the creep behaviour. The samples were prepared through melt compounding, using two high-density polyethylenes with different melt flow rate (MFR), two different organo-modified clays, and changing the relative amount of a polyethylene grafted with maleic anhydride (PEgMA) compatibilizer. The intercalation process is more effective as the matrix melt viscosity decreases (higher MFR), while the clay interlamellar spacing increases as the compatibilizer amount increases. The relative stiffness of the nanocomposites increases with the addition of clay, with a limited enhancement of the relative yield stress. The better intercalation obtained by the addition of the compatibilizer is not accompanied by a concurrent improvement of the tensile mechanical properties. The creep resistance is enhanced by the introduction of clay, with an appreciable dependence on both the polyethylene and the clay type.

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Section: X-ray Diffraction Measurementssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Tensile mechanical response of polyethylene – clay nanocomposites

Pegoretti

Dorigato²,

Penati³

2007

Express Polym. Lett.

101

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“…This performance was achieved through a synergy of montmorillonite nanofillers and EVA-copolymer additive, that resulted in a general cohesive failure behavior. This resulted in peelable heat seals independent of sealing method (ranging from high pressure and 8 s dwell time, to low pressures and sub-second dwell times) over a very broad range of seal temperatures (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) • C range for the nanocomposites, instead of 2-5 • C for neat PE sealants, or 10 • C for PB-containing peelable sealants), as well as markedly independent of the seal substrate (on itself, on typical PE sealants and on HDPE). The origins and the mechanism of Figure 12.…”

Section: Discussionmentioning

confidence: 99%

“…Given the extensive use of polyethylene sealants worldwide, and the possible enhanced performance of polyethylene/clay nanocomposite films (which combine high gas barrier, optical transparency and improved thermomechanical properties [29][30][31][32][33][34][35]) it is very timely to study and tailor the heat-sealing performance of PE/clay nanocomposites, if their use in flexible packaging is to be proliferated. In general, fused PE seals are well established and are straightforward to realize and to manufacture.…”

Section: Introductionmentioning

confidence: 99%

Tailored Polyethylene Nanocomposite Sealants: Broad-Range Peelable Heat-Seals Through Designed Filler/Polymer Interfaces

Zhang

Manias

Polizos

et al. 2009

Journal of Adhesion Science and Technology

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The heat sealing behavior of novel polyethylene-based nanocomposite films was investigated, as they relate to flexible packaging of fresh-cut vegetables, processed foods and biomedical devices. Appropriately designed sealant nanocomposites, which include dispersed montmorillonite nanofillers and ethyl vinyl acetate copolymer, produce a hermetic but peelable heat seal across a broad, 30-40 • C, range of heat sealing temperatures, outperforming optimized commercial polyethylene-based sealants that achieve peelable seals in a much narrower heat sealing temperature range, of less than 15 • C. Appropriate nanocomposite design leads to a general easy-open/peelable character of heat seals, which is: (a) independent of sealing conditions and apparatus -ranging from long dwell times at very high sealing pressures to very short heat impulses at very low sealing pressures; (b) markedly independent of the opposite side of the heat seal -for example, when sealed on itself, on unfilled sealant, or on high density polyethylene; and (c) rather insensitive to formulation variations of the sealant -for example, variations of the polyethylene of the ethyl vinyl acetate type and concentration, and of nanofiller loading. Insights from observations of the fracture seal surfaces by infrared spectroscopy and electron microscopy reveal that the underlying mechanism of this behavior is related to a synergistic effect of the ethyl vinyl acetate copolymer and the montmorillonite clay nanofiller, which introduces weak interfaces in the nanocomposite that lead to cohesive failure of the sealant.

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“…Especially, the direct melt intercalation method attained more commercial attraction since it is the most versatile and environmentally benign among all the methods of preparing polymer/clay nanocomposites (Alexandre & Dubois, 2000;Pavlidou & Papaspyrides, 2008;Sinha Ray & Okamoto, 2003;Zou et al, 2008). The melt blending (Araújo, Barbosa, Rodrigues, Melo, & Ito, 2007;Choi, Cheigh, Lee, & Chung, 2011;Zhao et al, 2005;Zhong & Kee, 2005) and in situ polymerization (Bergman, Chen, Giannelis, Thomas, & Coates, 1999;Jin, Park, Im, Kwak, & Kwak, 2002;Sun & Garces, 2002) methods have been used for the preparation of PE or PP/clay nanocomposites.…”

Section: Introductionmentioning

confidence: 99%