Partially miscible EVOH/copolyamide-6/6.9 blends: The effect of stretching on the structure

Nir, Y.; Narkis, M.; Siegmann, A.

doi:10.1002/(sici)1099-0488(20000315)38:6<813::aid-polb1>3.0.co;2-z

Cited by 7 publications

(6 citation statements)

References 35 publications

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“…Incarnato et al [26] studied the relationships between composition and properties of the polyamide-6 (PA6)-ethylenevinyl-alcohol system and the results were interpreted in terms of compatibility level between both polymers. Nir et al [27] prepared binary blends of random copolymers and ethylene-vinyl-alcohol to obtain blown films and studied the barrier properties. Lu and Sue [28] prepared blown films from LDPE and linear low-density polyethylene (LLDPE) and studied the final morphology.…”

Section: Introductionmentioning

confidence: 99%

Effect of Freeze-Line Position and Stretching Force on the Morphology of LDPE-PA6 Blown Films

Robledo‐Ortíz

Ramírez‐Arreola

González‐Núñez

et al. 2006

Journal of Plastic Film & Sheeting

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Blends of low density polyethylene (LDPE) and polyamide-6 (PA6) are produced via blown film extrusion to study the effect of freeze-line position and stretching force on blend morphology. An experimental setup is designed to measure the stretching force as a function of draw ratio (DR) and freeze-line position for 4, 6, and 10 wt% PA6 in LDPE. Numerical simulations of the non-isothermal and viscoelastic process are in good agreement with the experimental data of film dimensions. However, as reported many times in the literature, the calculated stretching force is underestimated and can be predicted more precisely by using a simple correction factor. The results also show that the dispersed phase deformation increases with DR and decreases with freeze-line height.

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Section: Introductionmentioning

confidence: 99%

Effect of Freeze-Line Position and Stretching Force on the Morphology of LDPE-PA6 Blown Films

Robledo‐Ortíz

Ramírez‐Arreola

González‐Núñez

et al. 2006

Journal of Plastic Film & Sheeting

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“…Besides, Cerreda et al have shown that the composition and the thermal history of EVOH film also influence the crystalline structure. Therefore, it would be better to estimate the degree of crystallinity from the X-ray diffraction measurements by calculating the ratio of the crystalline peak area to the total area . In our case, the influence of plasma treatment on crystallinity rate can be discussed on the basis of the quantity of Δ H m – Δ H c calculated from TMDSC results (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, it would be better to estimate the degree of crystallinity from the X-ray diffraction measurements by calculating the ratio of the crystalline peak area to the total area. 43 In our case, the influence of plasma treatment on crystallinity rate can be discussed on the basis of the quantity of ΔH m − ΔH c calculated from TMDSC results (Table 4). In general, from TMDSC data and taking into account the error of measurements, one can conclude that the cold plasma treatment has practically no influence on the thermal properties of EVOH films.…”

Section: Atomic Force Microscopy (Afm)mentioning

confidence: 99%

Improvement of Water Barrier Properties of Poly(ethylene-co-vinyl alcohol) Films by Hydrophobic Plasma Surface Treatments

et al. 2012

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Poly(ethylene-co-vinyl alcohol) (EVOH) films with two different ethylene contents (29 and 44 mol %) have been treated by hydrophobic plasma (CF4, tetramethylsilane (TMS), CF4/H2, and CF4/C2H2). Conditions of the cold plasma treatment were optimized by the water contact angle measurements as a function of the different plasma parameters (plasma power, gas flow, and treatment time). Chemical changes of the film surface were characterized by X-ray photoelectron spectroscopy. The obtained results revealed the presence of fluorine containing functional groups such as CF, CF2, and CF3 in the case of CF4, CF4/H2, and CF4/C2H2 plasma treatment and the presence of SiO x C y compounds after TMS treatment. The morphology of the plasma treated EVOH films was examined by atomic force microscopy, which indicated an increase of the film roughness after treatment. Negligible changes of thermal properties of the modified EVOH films were observed by means of the temperature modulated differential scanning calorimetry. The barrier properties of films were characterized by water permeability measurements. It was found that the hydrophobicity was significantly improved after plasma treatment and for some treated films the water permeability was decreased up to 28%.

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“…Blend technology has been widely exploited to improve the barrier properties of polymers. [ 13–19 ] A representative example is a polyolefin and EVOH blend, where the poor oxygen barrier properties of polyolefin were improved by the addition of EVOH. [ 17–19 ] While PK does have moderately high oxygen barrier properties, its use in packaging products has been limited owing to the demand for oxygen transmission rates (OTR) of <1.0 cc m −2 day −1 atm −1 .…”

Section: Introductionmentioning

confidence: 99%

Oxygen barrier properties of polyketone/EVOH blend films and their resistance to moisture

Kim

Cho

et al. 2020

J of Applied Polymer Sci

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Polyketone (PK) has excellent chemical and mechanical properties, but its use in food packaging is limited due to its oxygen barrier properties being insufficient for high‐barrier film applications. To improve its oxygen barrier properties, PK has been blended with ethylene vinyl alcohol copolymer (EVOH), which is one of the highest oxygen barrier polymers in use today. The oxygen barrier properties under both dry and humid conditions, as well as the mechanical properties of PK/EVOH blend films were investigated in this study. These novel PK/EVOH blend films exhibited unusually low oxygen permeability values from 0.3 to 0.16 cc 20 μm m−2 day−1 atm−1 with increasing EVOH content from 30 to 70 wt%, which are even lower than those of the ideal laminar model that expresses the theoretical minimum permeability values attainable for blended barrier films. These high oxygen barrier properties of PK/EVOH blend films can conceivably be attributed to the combination of two dominant effects: a tortuous diffusion path through the EVOH domains in the PK matrix and hydrogen bonding interactions between PK and EVOH. Furthermore, in high‐humidity environments with retorting, the PK/EVOH blend films exhibited superior resistance to moisture over EVOH. Immediately after the retorting test, the oxygen permeability of the high‐barrier PK/EVOH blend films with an EVOH content of 30–40 wt% increased by less than 3× the pre‐retorting value, as opposed to 74× for EVOH. In addition, PK/EVOH blend films displayed superior stretching characteristics, with a breaking strain of over 300%, which are valuable for flexible packaging applications.

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Partially miscible EVOH/copolyamide-6/6.9 blends: The effect of stretching on the structure

Cited by 7 publications

References 35 publications

Effect of Freeze-Line Position and Stretching Force on the Morphology of LDPE-PA6 Blown Films

Effect of Freeze-Line Position and Stretching Force on the Morphology of LDPE-PA6 Blown Films

Improvement of Water Barrier Properties of Poly(ethylene-co-vinyl alcohol) Films by Hydrophobic Plasma Surface Treatments

Oxygen barrier properties of polyketone/EVOH blend films and their resistance to moisture

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