Interfacial interactions and reinforcement in thermoplastics/zeolite composites

Kajtár, Dóra Andrea; Kenyó, Csaba; Renner, Karl; Móczó, János; Fekete, Erika; Kröhnke, Christoph; Pukánszky, Béla

doi:10.1016/j.compositesb.2016.12.015

Cited by 16 publications

(11 citation statements)

References 29 publications

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Section: Resultsmentioning

confidence: 99%

“…In Figure 9 the connection between reinforcement and the average amplitude is presented for the composites with 20 vol% filler content. As parameter B depends on matrix properties, we used a correction proposed in our previous article 54 to estimate the extent of reinforcement, thus parameter B was multiplied by the natural logarithm of the true tensile strength of the matrix polymer. The results prove unambiguously that interfacial adhesion affects micromechanical deformation processes and macroscopic failure, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The slope of this straight line provides parameter B which is proportional to the extent of reinforcement, and it is determined by the particle size of the filler, 53 the strength of interfacial interaction 53 and the matrix strength. 54 The tensile strength of PP based composite series is plotted this way in Figure 4. The very different slopes of the fitted linear curves indicate dissimilar interfacial adhesion in the composites prepared with or without a coupling agent.…”

Section: Interfacial Adhesionmentioning

confidence: 99%

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Structural biomaterials engineered from lignocellulosic agricultural waste

Kárpáti

Kun

Fekete

et al. 2021

J of Applied Polymer Sci

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Milled sunflower husk was added to three types of polyolefins (polypropylene, low-density and high-density polyethylene) in a wide composition range. Composite series were prepared with or without maleic anhydride-grafted polyolefin coupling agents to investigate the effect of coupling on the mechanical properties and micromechanical deformation processes. Several independent approaches were followed to estimate interfacial adhesion qualitatively and quantitatively, respectively. The results show that interfacial adhesion is significantly improved in the presence of a coupling agent. As a result, coupling changes the dominant deformation process from matrix/filler debonding to the fracture of sunflower husk particles. Milled sunflower husk can enhance significantly the modulus of polyolefins; however, elongation-at-break values are very small, especially at larger filler content, which represents the largest obstacle of practical application.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Interfacial Adhesionmentioning

confidence: 99%

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Structural biomaterials engineered from lignocellulosic agricultural waste

Kárpáti

Kun

Fekete

et al. 2021

J of Applied Polymer Sci

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“…At a concentration of up to ca. 45 vol.-%, tensile strength slightly increased [35]. Reduction of the tensile strain at break by fillers was observed for polyethylene with dispersed, non-surface treated CaCO 3 [130], polyethylene with up to 55 wt.-% talc [131], PLA with up to 30 wt.-% talc [132], and zeolites [35] in PE-LD.…”

Section: Resultsmentioning

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%

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

2019

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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).

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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

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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.

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Interfacial interactions and reinforcement in thermoplastics/zeolite composites

Abstract: Ten different polymers were selected as possible matrices for zeolite containing desiccant composites in order to prepare functional packaging material. A 5A type zeolite was used as desiccant. Composites containing the zeolite up to 50 vol% were prepared.

Cited by 16 publications

References 29 publications

Structural biomaterials engineered from lignocellulosic agricultural waste

Structural biomaterials engineered from lignocellulosic agricultural waste

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

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