Mechanische Eigenschaften zyklisch be‐ und entfeuchteter Zeolithgranulate

Müller, Peter E.; Russell, Alexander; Seidenbecher, Jakob; Tomas, Jürgen

doi:10.1002/cite.201400162

Cited by 4 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

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

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

Desiccant films made of low‐density polyethylene with dispersed calcium oxide: Water vapor absorption, permeation and mechanical properties

Sängerlaub

Kücükpinar

Kiese

et al. 2018

J of Applied Polymer Sci

View full text Add to dashboard Cite

Polymers with dispersed desiccants are relevant for various packaging applications to protect packaged goods from water vapor. The intention of this study was to analyze and to describe a relevant system. Therefore, films with calcium oxide (CaO) were investigated, because such materials are hardly described in scientific literature. Monolayer films with 0.14 to 0.51 g dispersed CaO per 1 g film (PE‐LD) were prepared and they absorbed up to 0.2 g water vapor per 1 g of film. The water vapor absorption was described by effective diffusion coefficients. By the use of effective diffusion coefficients and the absorption capacity, the absorption behavior of layers with various thicknesses can be estimated. The steady state (effective) water vapor permeation coefficients of the films with dispersed CaO were a factor of 2 to 24 (8.4 to 101.5 mg cm [cm2 s Pa]–1 × 1012, at 23 °C) higher than for pure PE‐LD films (4.26 mg cm [cm2 s Pa]−1 × 1012, 23 °C). The tensile stress changed only slightly (pure PE‐LD: 9.5 N mm−2; PE‐LD with 0.14 g dispersed CaO per 1 g film: 8.1 N mm−2; PE‐LD with 0.51 g dispersed CaO per 1 g film: 10.5 N mm−2), while the tensile strain at break was reduced with higher CaO concentration from 318% (pure PE‐LD) to 10% (PE‐LD with 0.51 g dispersed CaO per 1 g film). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47460.

show abstract

Einfluss zyklischer Befeuchtung auf die mechanischen Eigenschaften hygroskopischer Aluminiumoxid‐Granulate

Müller

Russell

Bergstedt

et al. 2016

Chemie Ingenieur Technik

Self Cite

View full text Add to dashboard Cite

Der Einfluss zyklischer Befeuchtung auf die mechanischen Eigenschaften von γ‐Al2O3‐Granulaten bei Druckbeanspruchung wurde untersucht. Die Granulate wurden dazu zwei unterschiedlichen Befeuchtungs‐ und Entfeuchtungszyklen ausgesetzt. Bei Behandlung mit feuchter Luft verringern sich mit zunehmender Feuchtebeladung die mechanischen Eigenschaften signifikant. Mittels Regeneration im Trockenschrank kann der Ausgangszustand teilweise wiederhergestellt werden. Mehrere durchlaufene Befeuchtungszyklen wirken sich zudem zunehmend negativ auf die mechanischen Eigenschaften aus. Des Weiteren kann ein deutlicher Zusammenhang zwischen Granulatgröße und Schädigung beobachtet werden.

show abstract

Mechanische Eigenschaften zyklisch be‐ und entfeuchteter Zeolithgranulate

Cited by 4 publications

References 20 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

Desiccant films made of low‐density polyethylene with dispersed calcium oxide: Water vapor absorption, permeation and mechanical properties

Einfluss zyklischer Befeuchtung auf die mechanischen Eigenschaften hygroskopischer Aluminiumoxid‐Granulate

Contact Info

Product

Resources

About