Evolution of mechanical and barrier properties of thermally aged polycarbonate films

Diawara, Bassidi; Fatyeyeva, Kateryna; Chappey, Corinne; Colasse, Laurent; Ortiz, José; Marais, Stéphane

doi:10.1016/j.memsci.2019.117630

Cited by 9 publications

(12 citation statements)

References 56 publications

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“… 61.67 32 130 60–85 240–275 Lianhua and Qiang (2017) ; Mirjalili et al (2013) PEN Usually mixed with PET which is used to make bottle that are more heat resistance. 91.47 10–40 0.03–0.05 5.26 270 Bedia et al (2001) ; Zhong et al (2010) PC The film of PC is used for boil-in-bag packs and retort pouches due to its stability at high temperature 58–65 10–30 9500–10 000 97–110 250–280 Hassan and Jwu (2005) ; Diawara et al, 2020 ; Lagaron et al (2004) Polystyrene OPS poor barrier to water vapor and good barrier with high refractive index. Used for making disposable trays and containers.…”

Section: Propertiesmentioning

confidence: 99%

An overview of biodegradable packaging in food industry

Shaikh

Yaqoob

Aggarwal

2021

Current Research in Food Science

208

105

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For many years, conventional plastics are manufactured and used for packaging applications in different sectors. As the food industries are increasing, the demand for packaging material is also increasing. Plastics have transformed the food industry to higher levels; however, conventional petroleum-based plastics are non-degradable which has created severe ecological problems to the environment like a threat to aquatic life and degrading air quality. Biodegradable polymers or biopolymers emerged as an alternative approach for many industrial applications to control the risk caused by non-biodegradable plastic. According to the type of starting material, they have been categorized as polymers extracted from biomass, synthesized from monomers, and produced from microorganisms. The quality of biopolymers depends on the physical, mechanical, thermal, and barrier properties. The present review highlights the characteristics of various biopolymers and their blends, comparison of properties between non-biodegradable and biopolymers, the market potential for food packaging applications. The review also emphasizes different commercial forms like films, trays, bags, coatings, and foamed products for application as modified atmosphere packaging, active packaging, and edible packaging. Different issues affecting market growth like harmful products formed during production and consumer perception have also been discussed. Information on biopolymers is widely scattered over many sources, this article aims to provide an overview of biodegradable polymer packages for food applications.

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Section: Propertiesmentioning

confidence: 99%

An overview of biodegradable packaging in food industry

Shaikh

Yaqoob

Aggarwal

2021

Current Research in Food Science

208

105

View full text Add to dashboard Cite

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“…Assuming that diffusion is a constant process across the polymer membrane, the oxygen diffusion coefficient D I can be calculated from the transient permeation curve at the inflexion point I (i.e., at time t 0.24 corresponding to J/J stat = 0.24) as follows 13,31 :

D_{I} = \frac{0.09 L^{2}}{t_{0.24}}

and at the point L (i.e., at time t L , “time‐lag” for which J/J stat = 0.6167) according to Equation (3).…”

Section: Resultsmentioning

confidence: 99%

“…Diffusion is a kinetic parameter determining how fast a permeant molecule will pass through the membrane and it is mostly related to the size of the permeant molecules. The kinetic diameter of O 2 is 3.46 Å and that of water vapor is 2.65 Å 18,31 . So, one can suppose that water vapor will diffuse faster than oxygen molecules across the membrane.…”

Section: Discussionmentioning

confidence: 99%

“…Also, in case of water vapor, possible interactions between diffusing molecules and some molecular groups of the polymer chains should be taken into consideration as they may increase the free volume by the plasticizing effect, thus leading to the diffusivity increase. However, the diffusivity alone of the permeant molecule cannot accurately determine the permeability as a larger molecule, for example, CO 2 (3.30 Å 31 ), can also diffuse faster in a rubber polymer due to its high solubility (high critical temperature), which is determined by the solubility coefficient. Since the first step in the solution‐diffusion mechanism is the sorption at the upstream surface, a membrane surface that is modified to achieve high sorption of a certain permeant molecule will result in a high permeability of this component.…”

Section: Discussionmentioning

confidence: 99%

“…Owing to the biomedical application and to check a possible effect of the gas pressure on the PU oxygen permeability, oxygen permeation measurements as a function of the applied pressure were performed by the well‐known time‐lag method using a home‐made apparatus with two compartments 31 . The sample with effective area of 3.14 cm 2 was first purged under vacuum.…”

Section: Methodsmentioning

confidence: 99%

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Enhanced water and oxygen barrier performance of flexible polyurethane membranes for biomedical application

Marcano

Fatyeyeva

Koun

et al. 2021

J Biomedical Materials Res

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In order to improve water and oxygen barrier properties, the surface of two commercial medical grade polyurethane (PU) membranes (Chronoflex® AR‐LT and Bionate® II) was modified by a spray deposited film of poly(ethylene‐co‐vinyl alcohol) (EVOH). The influence of the temperature, the deposited layer thickness and the EVOH ethylene group percentage (27%, 32%, and 44% for EVOH27, EVOH32, and EVOH44, respectively) on the barrier properties of the PU/EVOH multilayered membranes was investigated. The increase of the EVOH layer thickness leads to higher oxygen barrier properties (the highest barrier improvement factor of 412 was obtained). However, in case of the deposited layer thickness higher than 18 μm, microcracks appeared on the treated surface promote a significant loss of the barrier effect. Due to its higher crystallinity degree, EVOH27 provides a higher oxygen barrier effect compared to EVOH32 and EVOH44. On the contrary, an increase of the water barrier properties was observed with the increase of the percentage of ethylene groups. Moreover, the delamination of the EVOH layer was noted after water permeation, especially in case of EVOH44, which is the most hydrophobic layer. Nevertheless, significant decrease of the water and oxygen permeability of the modified PU membranes was achieved, thus showing the benefit of using the EVOH spray deposition for the biomedical application, which requires high performance material with flexible and barrier properties.

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