Functional properties of foamed and/or stretched polypropylene-films containing sodium chloride particles for humidity regulation

Sängerlaub, Sven; Seibel, Karoline; Miesbauer, Oliver; Pant, Astrid; Kiese, Sandra; Rodler, Norbert; Schmid, Markus; Müller, Kajetan

doi:10.1016/j.polymertesting.2017.12.002

Cited by 18 publications

(9 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The application of these equations to the here considered materials is a simplification, and therefore, D should be interpreted as an effective diffusion coefficient D eff. [36].…”

Section: Methodsmentioning

confidence: 99%

“…Dispersing desiccants and water vapor absorbers in polymer structures is a strategy described already by other research groups. Materials made of desiccants and water vapor absorbers such as calcium chloride, sodium chloride, calcium oxide, magnesium oxide, zeolites and molecular sieves, silica gel, and metal-organic frameworks dispersed in various polymers have already been tested [24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Desiccant Films Made of Low-Density Polyethylene with Dispersed Silica Gel—Water Vapor Absorption, Permeability (H2O, N2, O2, CO2), and Mechanical Properties

2019

View full text Add to dashboard Cite

Silica gel is a well-known desiccant. Through dispersion of silica gel in a polymer, films can be made that absorb and desorb water vapor. The water vapor absorption becomes reversible by exposing such films to a water vapor pressure below that of the water vapor pressure during absorption, or by heating the film. The intention of this study was to achieve a better understanding about the water vapor absorption, permeability (H2O, N2, O2, CO2), and mechanical properties of films with dispersed silica gel. Low-density polyethylene (PE-LD) monolayer films with a nominal silica gel concentration of 0.2, 0.4, and 0.6 g dispersed silica gel per 1 g film (PE-LD) were prepared and they absorbed up to 0.08 g water vapor per 1 g of film. The water vapor absorption as a function of time was described by using effective diffusion coefficients. The steady state (effective) water vapor permeation coefficients of the films with dispersed silica gel were a factor of 2 to 14 (8.4 to 60.2·10−12 mg·cm·(cm²·s·Pa)−1, 23 °C) higher than for pure PE-LD films (4.3·10−12 mg·cm·(cm²·s·Pa)−1, 23 °C). On the other hand, the steady state gas permeabilities for N2, O2, and CO2 were reduced to around one-third of the pure PE-LD films. An important result is that (effective) water vapor permeation coefficients calculated from results of sorption and measured by permeation experiments yielded similar values. It has been found that it is possible to describe the sorption and diffusion behavior of water by knowing the permeability coefficient and the sorption capacity of the film (Peff.≈Seff.·Deff.). The tensile stress changed only slightly (values between 10 and 14 N mm−²), while the tensile strain at break was reduced with higher nominal silica gel concentration from 318 length-% (pure PE-LD film) to 5 length-% (PE-LD with 0.6 g dispersed silica gel per 1 g film).

show abstract

“…The application of these equations to the here considered materials is a simplification, and therefore, D should be interpreted as an effective diffusion coefficient D eff. [36].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Desiccant Films Made of Low-Density Polyethylene with Dispersed Silica Gel—Water Vapor Absorption, Permeability (H2O, N2, O2, CO2), and Mechanical Properties

2019

View full text Add to dashboard Cite

show abstract

“…Guo et al (2018) studied the hygroscopic behavior of cellulose nanofiber-based films, Chand and Kumar (2018) analyzed the application of hydroxypropylmethyl cellulose and carboxymethyl cellulose edible coatings on Jaggery cubes. Sängerlaub et al (2018) developed PLA films with dispersed CaCl 2 (2-4 wt%) by extrusion that could absorb up to 15 wt% water vapor at 75% RH at 23 • C. The functionality of these devices could be broadened by adding other types of active components such as O 2 -scavengers, CO 2 -generators, and antimicrobials (Janjarasskul and Suppakul, 2018). Future research focused in this area is expected.…”

Section: Moisture Absorbersmentioning

confidence: 99%

Recent Developments in Smart Food Packaging Focused on Biobased and Biodegradable Polymers

Salgado¹,

Giorgio²,

Musso³

et al. 2021

Front. Sustain. Food Syst.

128

View full text Add to dashboard Cite

Food packaging has a crucial function in the modern food industry. New food packaging technologies seek to meet consumers and industrial's demands. Changes related to food production, sale practices and consumers' lifestyles, along with environmental awareness and the advance in new areas of knowledge (such as nanotechnology or biotechnology), act as driving forces to develop smart packages that can extend food shelf-life, keeping and supervising their innocuousness and quality and also taking care of the environment. This review describes the main concepts and types of active and intelligent food packaging, focusing on recent progress and new trends using biodegradable and biobased polymers. Numerous studies show the great possibilities of these materials. Future research needs to focus on some important aspects such as possibilities to scale-up, costs, regulatory aspects, and consumers' acceptance, to make these systems commercially viable.

show abstract

“…This behavior is typical for materials that follow Fick's law. The slope of the curve decreased when the relative humidity reached targeted equilibrium, which can be explained by saturation [24,25]. From the initial linear section slope, D eff was calculated.…”

Section: Water Vapor Sorption and Permeationmentioning

confidence: 99%

“…Many polymers, especially polar polymers, show a "nonideal" behavior for the permeation of water vapor. Due to the fact that at polar polymers the water vapor permeability coefficient increases with higher RH due to swelling, their sorption isotherms deviated from Henry's law, so the applied equations for the sorption experiments are just approximations and the WVP is valid only for a defined RH on both sides of a film [24,25]. Therefore, studying of WVP of such polymers with an alternative method is of great interest to show their potential use in food packaging applications.…”

Section: Introductionmentioning

confidence: 99%

Water Vapor Transport Properties of Polyurethane Films for Packaging of Respiring Foods

Turan

2019

Food Eng Rev

View full text Add to dashboard Cite

Thermoplastic polyurethane (PU) polymers with different chemical compositions were synthesized and casted to films, and their water vapor barrier properties at different range of relative humidity (RH) were characterized. The water vapor permeability (WVP) of packaging films is one of their most important properties to identify their suitability for use as packaging materials and is rather a complicated phenomena if the polymer has polar nature. The WVPs of PU films are determined both by permeation measurements which are a steady-state method and water vapor sorption measurements which are a non-steady-state method. Effective permeability (P eff), solubility (S eff), and diffusion (D eff) coefficients of PU films were determined at 23°C within the RH range of 0-97%. It was found that P eff , S eff , and D eff increased with increasing RH gradient due to water vapor and polymer interactions. Microscopic images showed that 1,4-butanediol (BDO) helped to improve porous structure. Castor oil (CO) caused a decrease in the intensity of active absorption sites, namely, the C=O•••H-N hydrogen bonds between chains. Results of two methods were yielded in the same magnitude of order. In most cases, the non-steady-state (sorption) method yields higher WVP values than steady state. At 0➔85% RH, the difference was up to 8-fold. Conditioning and equilibrating of films at 50% RH helped to reach sorption data approximate to permeation data. It was suitable to use sorption measurements to estimate the WVP which is a considerable simplification for polar polymers, e.g., developed PU film.

show abstract

Functional properties of foamed and/or stretched polypropylene-films containing sodium chloride particles for humidity regulation

Cited by 18 publications

References 63 publications

Desiccant Films Made of Low-Density Polyethylene with Dispersed Silica Gel—Water Vapor Absorption, Permeability (H2O, N2, O2, CO2), and Mechanical Properties

Desiccant Films Made of Low-Density Polyethylene with Dispersed Silica Gel—Water Vapor Absorption, Permeability (H2O, N2, O2, CO2), and Mechanical Properties

Recent Developments in Smart Food Packaging Focused on Biobased and Biodegradable Polymers

Water Vapor Transport Properties of Polyurethane Films for Packaging of Respiring Foods

Contact Info

Product

Resources

About