Relation of free volume and barrier properties in the miscible blends of poly(vinyl alcohol) and nylon 6-clay nanocomposites film

“…Although TPU/nanofiller blend films with improved barrier ability have been obtained by solution blending, these nanocomposites are not favorable for mass reduction. Melt‐blending with other barrier polymers is also an effective and economical method to prepare high‐barrier films . Ethylene‐vinyl alcohol copolymer (EVOH) features high gas‐barrier ability, good processability, excellent transparency, and mechanical strength and is a good oxygen‐barrier material for food and packaging applications.…”

Section: Introductionmentioning

confidence: 99%

Tailoring morphology to improve the gas-barrier properties of thermoplastic polyurethane/ethylene-vinyl alcohol blends

et al. 2016

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The morphology and helium-barrier properties of thermoplastic polyurethane (TPU)/ethylene-vinyl alcohol (EVOH) blends with and without dicumyl peroxide (DCP) were investigated by melting blending. A lamellar dispersion of EVOH with good helium-barrier properties was observed in the TPU matrix with DCP. The evolution of the morphology of the blends is mainly related to the variation of the viscosity ratio between the dispersed phase and the matrix phase. Compared with pure TPU, lamellar morphology increased the helium-barrier properties of the TPU/ EVOH (60/40) blend by as much as 10-fold. We also explored the effects of composition, DCP content, and blending sequence on the morphology and helium-barrier properties of the TPU/EVOH blends. The morphology of the blends ranged from a droplet-matrix to a lamellar structure. We determined the optimum amount of DCP to improve the helium barrier of the blends. The heliumbarrier properties of the blends prepared by direct blending were superior to those of the blends prepared by twosegment blending, and the blends prepared by direct blending exhibited a well-developed lamellar morphology. We compared the permeability of the samples with the theoretical results to explain the relationship between morphology and helium-barrier properties. POLYM. ENG.

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“…That is, the oxygen permeability of SR is reduced the most by almost 82% by incorporating 3 wt% of St‐LDH in the SR. Such a significant decrease in the oxygen permeability is attributed to reduced free volume due to the nanometric level of dispersion of exfoliated St‐LDH in the SR nanocomposite 54–56. However, only a 70% reduction in permeability is observed with 5 wt% loading, which is presumably due to aggregation of clay at higher loading.…”

Section: Resultsmentioning

confidence: 99%

Effect of bilayered stearate ion‐modified MgAl layered double hydroxide on the thermal and mechanical properties of silicone rubber nanocomposites

Pradhan

Srivastava

Bhowmick

et al. 2011

Polymer International

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The homogeneous dispersion of nanofillers in polymer matrices to form polymer nanocomposites remains a challenge in the development of high-performance polymer materials for various applications. In the work reported, a stearate ionmodified Mg-Al layered double hydroxide (St-LDH) as nanofiller was incorporated in a silicone rubber (SR) matrix by solution intercalation and subsequently characterized. X-ray diffraction and transmission electron microscopy studies confirm the formation of a predominantly exfoliated dispersion of St-LDH layers of 75-100 nm in width and about 1-2 nm in thickness in the SR. Thermogravimetric analysis shows that the thermal degradation temperature of the exfoliated SR/St-LDH (1 wt%)nanocomposites is about 80 • C higher than that of pure SR. Differential scanning calorimetric studies indicate that the melting and crystallization temperatures are higher by 4 and 10 • C for 5 and 8 wt% St-LDH-loaded SR nanocomposites compared to neat SR. A significant improvement of 97% in tensile strength and 714% in storage modulus and a reduction of 82% in oxygen permeability have been achieved at 3 wt% St-LDH loading in SR.

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Relation of free volume and barrier properties in the miscible blends of poly(vinyl alcohol) and nylon 6-clay nanocomposites film

Cited by 30 publications

References 28 publications

Recent Developments in the Permeability of Polymer Clay Nanocomposites

Recent Developments in the Permeability of Polymer Clay Nanocomposites

Tailoring morphology to improve the gas-barrier properties of thermoplastic polyurethane/ethylene-vinyl alcohol blends

Effect of bilayered stearate ion‐modified MgAl layered double hydroxide on the thermal and mechanical properties of silicone rubber nanocomposites

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