Structure evolution during film blowing: An experimental study using in-situ small angle X-ray scattering

Troisi, EM Enrico; Drongelen, van M Martin; Caelers, Hjm Harm; Portale, Giuseppe; Peters, Gwm Gerrit

doi:10.1016/j.eurpolymj.2015.11.022

Cited by 35 publications

(27 citation statements)

References 32 publications

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“…[13][14][15][16] In order to analyse the degree of orientation of PP crystal plane in BOPP films, the ratio of intensity between diffraction peaks corresponding to (040) and (110) planes in XRD patterns was considered ( Table 2). Taking into account that I (040) /I (110) ratio in isotropic samples is 0.71, the larger deviation from this value appreciated in Table 2 indicated a preferred PP crystal orientation in both BOPPP films, agreeing with the results reported by Troisi et al 17,18 And the ratio of I (040) / I (110) of modified BOPP is slightly smaller, indicating that nanosilica is more favourable for PP to form a more complete crystal structure on the (110) crystal plane and improve (110) peak intensity, making the ratio of I (040) /I (110) slightly reduced relative to the unmodified BOPP.…”

Section: Changes Of Bopp Film Morphology Before and After Modificationsupporting

confidence: 91%

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Zhang

et al. 2018

Packag Technol Sci

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In this article, a silica/EVA/PP composite was prepared by melt‐blending nanosilica with polypropylene, and a surface‐modified BOPP film was prepared by using this as raw material. SEM studies have shown the special microscopic morphology of the surface and its cross section. X‐ray diffraction (XRD) characterized and analysed crystallinity, molecular orientation, and grain size in the modified film. Furthermore, the presence of microholes in the modified film was verified by positron annihilation spectroscopy. The results show that compared with the unmodified films, the modified BOPP films have higher crystallinity and smaller grain size. Its dense surface structure and reticular fibre bundle structure make the diffusion coefficient and solubility of ethyl acetate small in the film. The mechanical properties, barrier properties, heat resistance, and ink adhesion of this film have been significantly improved. Modified film can be used as the food packaging film which has high performance and low residue.

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Section: Changes Of Bopp Film Morphology Before and After Modificationsupporting

confidence: 91%

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Zhang

et al. 2018

Packag Technol Sci

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“…This is also shown by Troisi et al. 1 in their study of structure evolution during film blowing of LDPE/LLDPE 10/90 blend. Figure 13 shows that at 20% LDPE there is a sharp increase in lamellar orientation and then a moderate increase up to 80% LDPE.…”

Section: Resultssupporting

confidence: 75%

“…There have been many studies performed to understand rheology (especially elongational viscosity and melt strength), structure evolution during film blowing, and thermal properties of LLDPE/LDPE blends. 1–14 Studies have been performed to understand the effect of the addition of small amounts of LDPE, i.e. less than 20%, to a LLDPE to understand the impact of the LDPE addition on LLDPE film physical properties such as tensile properties, Elmendorf tear strength, dart impact strength, etc.…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of structure–property relationships in blown films of linear low density polyethylene/low density polyethylene blends

Patel

Karjala

Savargaonkar

et al. 2019

Journal of Plastic Film & Sheeting

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This study was undertaken to fundamentally understand structure–property relationship of blown films of linear low density polyethylene/low density polyethylene blends over the entire composition range via decoupling orientation effects from their intrinsic properties. Three different low density polyethylene blends with an octene Ziegler–Natta linear low density polyethylene resin were studied. The machine direction tear strengths of blown film of linear low density polyethylene/low density polyethylene blends went through a minimum as the low density polyethylene concentration increased, almost a mirror image of the melt strength curve for these blends. The machine direction tear decreased significantly up to 40% low density polyethylene, much sharper decrease compared to decrease in intrinsic tear suggesting orientation effects dominating the machine direction tear behavior. The decrease in the dart impact and puncture energy was also due to both an increase in the machine direction orientation, and a decrease in the intrinsic toughness due to decrease in the tie chain concentration, as the low density polyethylene content increased.

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“…This latter parameter comes close to that corresponding to a take-up ratio of 40 [ 34 ], and the selected elongational rates represent reasonable values within the rate distribution occurring during the film blowing process. In fact, the bubble is characterized by a wide distribution of Hencky strain rates [ 37 ], but they are within the range of the extensional rheological measurements carried out in this work…”

Section: Resultsmentioning

confidence: 87%

Nanosilicates in Compatibilized Mixed Recycled Polyolefins: Rheological Behavior and Film Production in a Circular Approach

et al. 2021

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Currently, plastic packaging represents a global challenge and has become a key point of attention for governments, media and consumers due to the visibility of the waste it generates. Despite their high resource efficiency, the perceived non-recyclability of polymeric films risks precluding them from being a relevant packaging solution in a circular economy approach. In this regard, the aim of this study was to implement a strategy to try closing the loop, via the mechanical recycling of post-consumer flexible packaging of small size (denoted as Fil-s) to obtain new films. In particular, two lots of Fil-s were used, which are PE/PP blends differing for the PP content and the presence of polar contaminants. The suitability for film blowing extrusion of these recycled materials, as such and after the addition of a compatibilizer and/or a lamellar nanosilicate, was evaluated. It was first evidenced that the difficulty of producing blown films with the pristine recycled materials, due to the frequent bubble breakages, occurring even at low draw ratios. Moreover, the shear and extensional rheological behavior of all Fil-s based systems was usefully correlated with their processability features, evidencing the key roles of the nanofiller to stabilize the bubble and of the compatibilizer to ensure a uniform film deformation, avoiding its premature breakage. Even if the adopted upgrading strategies allowed the production of blown films with both types of Fil-s, the different components of the recycled matrices were proven to significantly affect their processability and final film performances.

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Structure evolution during film blowing: An experimental study using in-situ small angle X-ray scattering

Cited by 35 publications

References 32 publications

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Crystalline structure and morphology of biaxially oriented polypropylene film under the coexistence of organic silica particles and its influence on the adsorption diffusion of polar solvent molecules

Fundamentals of structure–property relationships in blown films of linear low density polyethylene/low density polyethylene blends

Nanosilicates in Compatibilized Mixed Recycled Polyolefins: Rheological Behavior and Film Production in a Circular Approach

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