Impact of corona treatment on PLA film properties

Rocca-Smith, Jeancarlo R.; Karbowiak, Thomas; Marcuzzo, Eva; Sensidoni, Alessandro; Piasente, Francesca; Champion, Dominique; Heinz, Olivier; Vitry, Pauline; Bourillot, Eric; Lesniewska, Éric; Debeaufort, Frédéric

doi:10.1016/j.polymdegradstab.2016.03.020

Cited by 60 publications

(55 citation statements)

References 35 publications

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“…It is seen that the values of roughness gradually increase with increasing exposure time. The roughness is increased due to the removal of top few monolayers of the polymer films, caused by the impact of electric discharge of corona on the surface, going from a R a value of 1.35 nm without treatment to 3.99 nm with an exposure time of 40 s to corona treatment which is similar to those reported in literature (Han, Kim, & Park, 2014;Rocca-Smith et al, 2016). Following the theory of adhesion (Shenton & Stevens, 2001), this roughness could act positively on the coating adhesion by creating much more specific surface.…”

Section: Resultssupporting

confidence: 87%

Preparation and characterization of poly(ethylene terephthalate) films coated by chitosan and vermiculite nanoclay

Essabti

Guinault

Roland

et al. 2018

Carbohydrate Polymers

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Chitosan (CS) layers are coated on a poly(ethylene terephthalate) (PET) film in order to decrease the oxygen permeability through the polymeric films for food packaging applications. Oxygen transmission rate (OTR) of the 130 μm PET films can be decreased from 11 to only 0.31 cm/m².day with a coated layer of 2 μm of CS. Additional decrease is obtained with the addition of vermiculite (VMT) to CS matrix in high proportion (40 to 50 w/w%). The OTR of the coated PET films decreased to very low values, below the detection limit of commercial instrumentation (≤0.008 cm/m day). This high-barrier behavior is believed to be due to the brick wall nanostructure, which produces an extremely tortuous path for oxygen molecules.

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Section: Resultssupporting

confidence: 87%

Preparation and characterization of poly(ethylene terephthalate) films coated by chitosan and vermiculite nanoclay

Essabti

Guinault

Roland

et al. 2018

Carbohydrate Polymers

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“…As concerns the barrier properties of PLA films, water vapor permeability (WVP) values (ranging from 1 × 10 −14 to 4 × 10 −14 kg·m/s·m·Pa) [ 7 , 8 , 28 , 29 ] are low compared to starch films but oxygen permeability is very high (2.4 × 10 −15 kg·m/s·m·Pa) [ 30 ]. As gas permeability is a problem for PLA, Rocca-Smith et al [ 31 ] applied a corona treatment to PLA films and observed improved gas (He, O 2 , CO 2 ) barrier properties, with modifications in both the surface and bulk of the films. In particular, the surface analysis revealed an increase in polarity and roughness, while some modifications of the mechanical properties and degree of crystallinity were also observed in the resulting films.…”

Section: The Main Characteristics Of Pla Materialsmentioning

confidence: 99%

Combination of Poly(lactic) Acid and Starch for Biodegradable Food Packaging

2017

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The massive use of synthetic plastics, in particular in the food packaging area, has a great environmental impact, and alternative more ecologic materials are being required. Poly(lactic) acid (PLA) and starch have been extensively studied as potential replacements for non-degradable petrochemical polymers on the basis of their availability, adequate food contact properties and competitive cost. Nevertheless, both polymers exhibit some drawbacks for packaging uses and need to be adapted to the food packaging requirements. Starch, in particular, is very water sensitive and its film properties are heavily dependent on the moisture content, exhibiting relatively low mechanical resistance. PLA films are very brittle and offer low resistance to oxygen permeation. Their combination as blend or multilayer films could provide properties that are more adequate for packaging purposes on the basis of their complementary characteristics. The main characteristics of PLA and starch in terms of not only the barrier and mechanical properties of their films but also of their combinations, by using blending or multilayer strategies, have been analyzed, identifying components or processes that favor the polymer compatibility and the good performance of the combined materials. The properties of some blends/combinations have been discussed in comparison with those of pure polymer films.

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“…The AFM images of linear PLA, 3-arm PLA and high branching PLA film are shown in figure 6 . Contact angle was affected by surface topography and roughness [ 45 ]. Figure 6 a shows a sharper peak within the 30 nm range on linear PLA film, indicating that the repulsive force of linear PLA was small and performs a phenomenon of relaxation.…”

Section: Resultsmentioning

confidence: 99%

Effect on electrospun fibres by synthesis of high branching polylactic acid

Shen

Zhang

et al. 2018

R. Soc. open sci.

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Polylactic electrospun porous fibres have been widely used in tissue engineering scaffolds. However, the application of linear polylactic is limited due to its poor hydrophilicity, which leads to phase separation and has been seldom used in porous fibre preparation. Instead, branching polylactic acts as a new effective method to prepare porous fibres because it can increase polylactic polar property and make it easy to be formulated in the following application. In the current study, we prepared an ultra-high molecular weight of high branching polylactic with glycerol as the initiator by controlling the ring-opening polymerization time, adding amount of catalyst and glycerol. The structure, molecular weight and thermal properties of copolymers were tested subsequently. The result showed that the surface of the high branching polylactic films is smooth, hydrophilic and porous. This branching polylactic formed electrospun porous fibres and possessed a strong adsorption of silver ion. Our study provided a simple and efficient way to synthesize branching polylactic polymer and prepare electrospun porous fibres, which may provide potential applications in the field of biomaterials for tissue engineering or antibacterial dressing compared with the application of linear polylactic and 3-arm polylactic materials.

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Impact of corona treatment on PLA film properties

Cited by 60 publications

References 35 publications

Preparation and characterization of poly(ethylene terephthalate) films coated by chitosan and vermiculite nanoclay

Preparation and characterization of poly(ethylene terephthalate) films coated by chitosan and vermiculite nanoclay

Combination of Poly(lactic) Acid and Starch for Biodegradable Food Packaging

Effect on electrospun fibres by synthesis of high branching polylactic acid

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