Morphology of polyethylene blends: 3. Blend films of polyethylene with styrene-butadiene or styrene-isoprene copolymers obtained by extrusion-blowing

Getlichermann, M.; David, Christiane

doi:10.1016/0032-3861(94)90376-x

Cited by 16 publications

(5 citation statements)

References 13 publications

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“…Both flow conditions tend to slightly elongate the droplets. This observation is in good agreement with results of other workers (14,15). It is observed that predeformed domain size (before drawing and blowing) becomes larger as the screw speed increases from 20 to 80 rpm.…”

Section: Effect Of Screw Rpmsupporting

confidence: 94%

“…2 as a function of screw rpm. Two steps are important for the development of morphology in extrusion-blown films of polymer blends (12)(13)(14). The first step is the dispersion of the minor phase in the complex shear and elongational field of the extruder barrel and die.…”

Section: Effect Of Screw Rpmmentioning

confidence: 99%

“…Subramanian (4, 5) obtained laminar morphology for blow molded containers by extruding HDPE / Nylon blends under special extrusion conditions. David and co-workers (12)(13)(14) observed the formation of a range of morphologies in blends of polyethylene with increasing content of styrene-isoprenestyrene triblock copolymers during extrusionblowing. Kamal and co-workers (6, 7) also obtained laminar morphology in polypropylene /EVOH blends under controlled processing conditions.…”

Section: Introductionmentioning

confidence: 99%

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Laminar morphology development and oxygen permeability of LDPE/EVOH blends

Lee

Kim

1997

Polymer Engineering & Sci

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Morphology and oxygen barrier properties of LDPE/EVOH blends have been studied. Laminar dispersion of ethylene‐vinyl alcohol copolymer (EVOH) with high oxygen barrier properties was obtained in the matrix of low density polyethylene (LDPE) when extruded through an annular blown film die. Various laminar morphologies were observed and the main factors determining the morphology of the blends were viscosity ratio of the components, processing conditions, and compatibilizer level. Oxygen permeation tests have shown that thinner and longer EVOH layers in larger numbers were more effective in reducing the oxygen permeability. The oxygen permeability of the compatibilized blend having 6 phr of LLD‐g‐MAH was reduced by a factor of 740. The correlation between morphology and oxygen permeability was explained as a function of the EVOH layer size (L × R) and the number of EVOH layers (N), which were closely related to the predeformed domain size (Lo × Ro). The high Weber number (resulted from large Lo × Ro and low interfacial tension) and low viscosity ratio yielded large L × R. However, small Lo × Ro produced high N. Experimental results of oxygen permeability were well correlated with (L × R) × N.

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Section: Effect Of Screw Rpmsupporting

confidence: 94%

Section: Effect Of Screw Rpmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laminar morphology development and oxygen permeability of LDPE/EVOH blends

Lee

Kim

1997

Polymer Engineering & Sci

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“…2 While polymer blending is commonly used to achieve improved mechanical properties, [2][3][4] it is currently used in plastic bags to improve biodegradability and recycling. 5,6 Literature can now be found on a wide variety of polymer film blends: linear low-density PE/polystyrene (LLDPE/PS), 7 PS/PVME, 8 LDPE/PP, 9,10 and ethyl vinyl acetate/ PP (EVA/PP) 9 as well as PE/nylon. 11 In industrial practice, film quality control is often performed offline in spite of the high production rates used to ensure film stability (typically 0.75-1.25 m/s) and the sensitivity of the film's mechanical properties to physical defects and distribution of the various polymer species within the blend.…”

Section: Introductionmentioning

confidence: 99%

“…Film blends have revolutionized the polymer industry due to their great versatility and capability to be tailored for specific end uses . While polymer blending is commonly used to achieve improved mechanical properties, − it is currently used in plastic bags to improve biodegradability and recycling. , Literature can now be found on a wide variety of polymer film blends: linear low-density PE/polystyrene (LLDPE/PS), PS/PVME, LDPE/PP, , and ethyl vinyl acetate/PP (EVA/PP) as well as PE/nylon …”

Section: Introductionmentioning

confidence: 99%

Potential of Hyperspectral Imaging for Quality Control of Polymer Blend Films

Gosselin

Rodrigue

González‐Núñez

et al. 2009

Ind. Eng. Chem. Res.

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A visible−near-infrared (VIS-NIR) hyperspectral imaging sensor is proposed for online nondestructive monitoring of polymer film blends produced by extrusion blowing. Such a sensor provides a much higher spatial resolution of analysis compared to probes or probe arrays, which should help in detecting smaller localized defects inducing poor film quality (mechanical, optical, barrier properties) at a macroscopic scale. Multiresolutional multivariate image analysis (MR-MIA) was used to extract those spectral and textural features from images that are the most highly correlated to film composition distribution and mechanical properties. When applied to a low-density polyethylene/polystyrene (LDPE/PS) blend produced under various operating conditions, the imaging sensor was able to monitor the two dominant effects on mechanical properties: (1) the effect of film composition (raw materials) and (2) the stretching effect caused by postextrusion conditions (process).

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Fibrillar morphology development of PE/PBT blends: Rheology and solvent permeability

Monticciolo

Cassagnau

Michel

1998

Polymer Engineering & Sci

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Morphology, rheology, and permeability studies were carried out for blends of polyethylene (PE) and polybutylene terephthalate (PBT). The effect of draw ratio at the die exit of the extruder on blend morphology was investigated, and thus isotropic fibrillar morphology with different aspect ratio was obtained. The solvent barrier properties of these blends improve as the aspect ratio of the PBT fibrils increases. Rheological experiments showed that these properties can be closely related to the development of a physical network structure of the PBT fibrils. Furthermore, the elaboration of a composite polymer system PE/PBT has been made by a second extrusion processing step. This system led to anisotropic oriented PBT fibrils in the PE matrix. Thus, random oriented PBT fibrils appeared to be an effective way of improving the barrier properties of PE/PBT blends.

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Morphology of polyethylene blends: 3. Blend films of polyethylene with styrene-butadiene or styrene-isoprene copolymers obtained by extrusion-blowing

Cited by 16 publications

References 13 publications

Laminar morphology development and oxygen permeability of LDPE/EVOH blends

Laminar morphology development and oxygen permeability of LDPE/EVOH blends

Potential of Hyperspectral Imaging for Quality Control of Polymer Blend Films

Fibrillar morphology development of PE/PBT blends: Rheology and solvent permeability

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