Interfacial self-adhesion of polyethylene blends: the role of long chain branching and extensional rheology

Najarzadeh, Zahra; Ajji, Abdellah; Bruchet, Jean-Baptiste

doi:10.1007/s00397-015-0843-1

Cited by 8 publications

(11 citation statements)

References 51 publications

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“…However, the measured peel strength will differ before and after cooling for each polymer due to forming crystals, changing toughness and rheological properties of the materials. 15,20…”

Section: Adhesionmentioning

confidence: 99%

Understanding the factors affecting the seal integrity in heat sealed flexible food packages: A review

et al. 2021

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Seal area represents the most problematic part in food packaging for controlling the moisture and gas ingress and preserving product quality. Understanding the mechanism of heat sealing, which is a widely used method in flexible packaging, is critical for maintaining product quality throughout the storage and preventing food waste.Likewise, understanding the factors causing the leak formation in the seal interface helps to avoid failures and increase integrity for all seal types produced by heat sealing methods. This review looks at heat sealing and its mechanisms in flexible food packaging materials and particularly focuses on the reasons behind the encountered seal integrity problems that have a detrimental effect on food quality and shelf life.Heat sealing mechanisms, form fill seal systems and seal types were analyzed. Then, factors affecting the leak formation have been grouped as process parameters, material properties, contaminants, and further processes, which is uncharted territory in open literature. Finally, the details of these groups and their interrelationships were examined and discussed. Revealed key factors as shown in this study are expected to guide future research for understanding leak formation mechanisms in flexible food packaging.

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“…However, the measured peel strength will differ before and after cooling for each polymer due to forming crystals, changing toughness and rheological properties of the materials. 15,20…”

Section: Adhesionmentioning

confidence: 99%

Understanding the factors affecting the seal integrity in heat sealed flexible food packages: A review

et al. 2021

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“…It was shown in a previous study that increasing amorphous content of sealant could improve hot tack and seal performance by improving molecular diffusion 2 . Although it was found that the crystallinity of the mPE layer was affected by the type of back‐layer material, but DSC results in Table 2 clearly showed that the crystallinity of mPE in HDPE back‐layer film was less than that in LLDPE and LDPE back‐layer films.…”

Section: Resultsmentioning

confidence: 87%

“…The wide range of properties expected from plastic films such as barrier, sealing, optical, and mechanical properties, as well as reducing final price of the package have been the main motivations for producing multicomponent films in plastic packaging industry 1 . Considering the previous studies in the literature on this subject, multicomponent sealants can be categorized as (a) single layer films composed of a multicomponent polymer blend, 2–5 (b) multilayer films with a single polymer in each layer, 6–9 and (c) multilayer films with a mixture of different polymers in some or all layers 10–13 …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, attempts have been made to reduce the sealant layer cost and overcome the drawbacks of processing films with neat metallocene polyethylene by blending them with polyethylene produced with conventional polymerization methods. Although this approach reduces the cost of the sealant layer, seal performance decreases considerably 2,10,17,20,21 . This indicates that the optimization of cost and performance is essential when blending metallocene with conventional polyethylene, which increases considerably the cost of this blending approach in industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Aghkand

Saffar

Ajji

2021

J of Applied Polymer Sci

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This work studies effects of back‐layer materials, thickness of sealant layer, and sealing condition on seal performance of multilayer polyethylene‐based films. Multilayer films with back‐layers of high‐density polyethylene (HDPE), or low‐density polyethylene (LDPE), or linear low‐density polyethylene (LLDPE) were produced with different thicknesses of the metallocene layer. It was found that increasing the thickness of the metallocene layer improved hot tack properties. In addition, films with back‐layers of LLDPE or LDPE showed higher hot tack strength compared to those with HDPE back‐layer. Increasing sealing temperature reduced significantly the hot tack strength and its dependency on metallocene layer thickness. It was found that increasing delay time after sealing, before peeling test, increased hot tack strength, but the rate of hot tack evolution and the type of peeling behavior were considerably affected by the type of back‐layer material. The effect of dwell time was also examined, and it was observed that increasing dwell time in the studied range did not affect the hot tack evolution. The mechanisms involved in the development of hot tack evolution were discussed, and it was shown that the back‐layer effects can be explained by bulk viscoelastic energy dissipation theory.

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“…This copolymer has been extensively studied because of its extremely favorable properties . EOC is an ethylene based elastomer, thus it shows an excellent compatibility with polyolefins, such as polyethylene and polypropylene (PP) . The presence of octene comonomer in EOC does not allow crystallinity typical for PE or PP homopolymers which causes higher flexibility.…”

Section: Introductionmentioning

confidence: 99%

Influence of clay nanofillers on properties of ethylene‐octene copolymers

et al. 2017

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The article deals with preparation, properties and usage of ethylene-octene copolymers/clay films. Different properties of two types of ethylene-octene copolymers (Engage 8540 and Engage 8842) with 17 and 45 wt% of octene (EOC-17 and EOC-45) were compared in nanocomposites with two types of clays-Cloisite 93A and Dellite 67. The aim was to evaluate the influence of (nano)filler type on ethylene-octene nanocomposites properties. Mechanical and thermal properties, morphology, and UV radiation degradation were observed. Furthermore, permeability of three different gasses was determined. EOC nanocomposites perform a higher elongation at break, especially EOC-45. Dynamic Mechanical Analysis (DMA) showed an increase of E 0 modulus of all nanocomposites in a wide range of temperatures compared to pure EOC. Intercalation of nanofillers was studied by transmission electron microscopy (TEM) and X-ray diffraction (XRD). It has been proved that EOC-45 has a better dispersion EOC-17. DSC analysis showed a shift in a crystallization temperature for EOC-17, where the nanofiller acted as a nucleation agent due to the worse dispersion. Barrier properties were improved by almost 100% by addition of organoclay for all measured gasses; they were best for EOC-17 nanocomposites due to a higher crystallinity. XRD together with transmission electron microscopy (TEM) showed much better dispersion for EOC-45 nanocomposites. Fourier transform infrared spectroscopy (FTIR) and accelerated UV aging showed C@O peaks for EOC nanocomposites. POLYM. COMPOS., 00:000-000, FIG. 3. DMA graphs temperature dependencies: EOC-17 (Engage 8540) with 5% Cloisite 93 and Dellite 67, EOC-45 (Engage 8842) with 5% Cloisite 93 and Dellite 67: (a) E 0 modulus, (b) tan d. [Color figure can be viewed at wileyonlinelibrary.com]

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Interfacial self-adhesion of polyethylene blends: the role of long chain branching and extensional rheology

Cited by 8 publications

References 51 publications

Understanding the factors affecting the seal integrity in heat sealed flexible food packages: A review

Understanding the factors affecting the seal integrity in heat sealed flexible food packages: A review

Effect of Back‐layer on seal performance of multilayer polyethylene‐based sealant films

Influence of clay nanofillers on properties of ethylene‐octene copolymers

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