The Effect of Vinyl Acetate Content and Polyisobutylene Concentration on the                 Properties of Metallocene Polyethylene-Ethyl Vinyl Acetate Coextruded Film for                 Stretch and Cling Film Applications

Mcnally, G. M.; Small, C. M.; Murphy, W. R.; Garrett, Graham E.

doi:10.1177/8756087905053791

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…McNally and Small investigated the effect of extrusion processing parameters as well as polyisobutylene concentration on the properties of polyethylene stretch and cling films, using a blown film and cast a film‐extrusion system and storage conditions of 25, 35, and 45°C for up to 28 days. Although McNally and Small have used with the T‐Peel test a different test method to study the cling behavior, the observed increase of the cling force with increasing aging time is in good accordance with the results presented here.…”

Section: Resultsmentioning

confidence: 99%

“…Cling forces increase with aging time at 25°C, showing significantly higher cling strengths if stored at higher temperatures up to 45°C. In both cases a maximum of the cling force could be expected after approximately two weeks of aging . Conditioning the stretch film at −40°C results in steady cling forces.…”

Section: Introductionmentioning

confidence: 86%

“…Conditioning the stretch film at −40°C results in steady cling forces. Summarizing the literature results, it can be stated that the main factors influencing migration kinetics of the PIB through a polyethylene matrix and therefore, the autohesion properties, are the molecular structure or co‐monomer type, crystallinity, density, and orientation of the matrix material as well as molecular weight and concentration of cling additives like PIB . Additionally, the storage conditions of the investigated stretch films have a direct impact on the cling properties and should therefore be strongly considered in further investigations…”

Section: Introductionmentioning

confidence: 96%

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Investigation of the migration behavior of polyisobutylene with various molecular weights in ethylene/α‐olefin copolymer blown stretch films for improved cling properties

Rennert

Fiedler

Nase³

et al. 2013

J of Applied Polymer Sci

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High retention forces are the basic requirements on stretch films for agricultural or pallet wrapping of goods and significantly influenced by cling properties (autohesion) that are essential for a reliable load stability during transportation and storage. Low molecular weight polyisobutylene (PIB) has tacky properties and is immiscible with polyethylene. Blended with ethylene/α‐olefin copolymers in coextruded stretch films, PIB can migrate to the film surfaces and cause cling properties. Cling and adhesion forces were investigated using the mechanical cling test, atomic force, and scanning electron microscopy and infrared spectroscopy. The molecular weight of the PIB as well as density and crystallinity of the matrix material have strong influences on migration kinetics and therefore, on the cling forces. Cling forces increase with increasing aging time, having a maximum after 2 weeks of production. The following slight decrease of the cling force might be correlated with a beginning degradation process of the UV sensitive PIB. Polyisobutylene with higher molecular weight diffuses slower through a linear low density polyethylene (LLDPE) matrix than lower molecular weight PIB, but can cause higher cling forces on the film surfaces. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40239.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Investigation of the migration behavior of polyisobutylene with various molecular weights in ethylene/α‐olefin copolymer blown stretch films for improved cling properties

Rennert

Fiedler

Nase³

et al. 2013

J of Applied Polymer Sci

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“…The low molecular weight (low viscosity or high MFI) resin will go to the surface of the film in this case. It has also been reported that, in incompatible blends, chains with higher surface free energy or having polar groups have a preference to be located at the film surface (Jalbert et al, 1993;Lee and Archer, 2001;Chen and Gardella ,1994;McNally, 2005a;McNally, 2005b). This higher concentration of EVA at the film surfaces causes superior hot-tack and seal strength results for high EVA content films.…”

Section: Blend Morphologymentioning

confidence: 87%

Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends

Najarzadeh

Tabasi

Ajji

2014

International Polymer Processing

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Seal strength behavior of low density polyethylene and ethylene vinyl acetate copolymer (PE/EVA) blends as well as that of blends of as eal grade PLA with aliphatic polyester (PCL) was studied. Polyethylene is commonly used for seal application in packaging multilayer structures and amorphous PLA is considered to be its counterpart for compostable and/or biodegradables ones. Incorporation of EVA in polyethylene improves its sealability in terms of ad ecrease in seal initiation temperature and broadness of sealability plateau. This was interpreted as due to the formation of finer crystals, adecrease in the melting point and presence of vinyl acetate polar group. These were supported by results obtained from differential scanning calorimetry (DSC) and Scanning electron microscopy (SEM). For the PLA/PCL system, the dispersed phase was stretched into elongated ellipsoidald omains. This type of morphology affected the mechanical and seal properties of the blends. As aresult of blending, both hot-tack initiation temperature and strength as well as seal initiation temperature were enhanced. The enhancement in these seal properties was significant when the concentration of the dispersed phase exceeded 20 wt% in the blend. Hot-tack strength of up to twice of pure PLA was achieved through blending. This was attributed to the lower glass transition temperature of PCL, resulting in enhanced mobility of PLA chains and also the high aspect ratio of the dispersed phase. The maximum obtained hot-tack strength (1 200 g/25 mm) at 40 %d ispersed content compared advantageously to commercially available polyolefin based sealant resins. The seal and hottack initiation temperatures were shifted to lower temperatures by as much as 30 8 C, which can allow faster and more energy efficient sealing process. 1I ntroductionHeat sealing is an important operation in packaging. Modern vertical and horizontal form fill seal (VFFS and HFFS) machines have aneed for operating at higher speeds. This requirement and the fact that the final package integrity is ultimately dependent on the results of the sealing process requires that the polymers used for the seal layer have superior hot-tack strength, low seal initiation temperature and wider sealing temperatures range. Although resin suppliers provide awide range of resins for the seal layer, with avariety of performances and physical properties, materials optimization is still achallenge. This challenge is even greater when the production line aims to use biodegradable materials which still cannot provide as superior properties as commercially available resins. Achieving sufficient adhesion upon sealing two semicrystalline polymer films in the fully or partially molten state is mainly ascribed to chain interdiffusion across the interface, amorphous fraction of material, and polymer chain functional groups.Coextrusion of low density polyethylene (LDPE) and ethylene vinyl acetate copolymer(EVA) has been used in industry to tailor as ealant layer. However, studies on correlation of physical properties ...

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Bulk rheology and surface tribo-rheometry toward the investigation of polyisobutylene migration in model and recycled multilayer agricultural films

Cabrera

Charbonnier²,

Pichon³

et al. 2020

Rheol Acta

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The Effect of Vinyl Acetate Content and Polyisobutylene Concentration on the Properties of Metallocene Polyethylene-Ethyl Vinyl Acetate Coextruded Film for Stretch and Cling Film Applications

Cited by 6 publications

References 3 publications

Investigation of the migration behavior of polyisobutylene with various molecular weights in ethylene/α‐olefin copolymer blown stretch films for improved cling properties

Investigation of the migration behavior of polyisobutylene with various molecular weights in ethylene/α‐olefin copolymer blown stretch films for improved cling properties

Sealability and Seal Characteristics of PE/EVA and PLA/PCL Blends

Bulk rheology and surface tribo-rheometry toward the investigation of polyisobutylene migration in model and recycled multilayer agricultural films

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