Wetting and hydrophobic modification of cellulose surfaces for paper applications

Samyn, Pieter

doi:10.1007/s10853-013-7519-y

Cited by 177 publications

(121 citation statements)

References 390 publications

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“…Below is a summary of publications, where different kinds of grafting were used to reduce hygroexpansion, change the water sorption isotherm, or at least increase the water repellency. Interested readers will find in-depth information about the surface treatments of paper in the extensive review by Samyn [139].…”

Section: Graftingmentioning

confidence: 99%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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Paper is a widely used packaging material and is nowadays regaining importance, e.g., as bio-based and biodegradable material. Moreover, new technologies such as polymer-fiber composites, printed electronics and the deep drawing of paper are developing. The process stability and also the resulting quality of paper converting processes such as coating, metallization, printing, and the printing of electronics are highly affected by the hygroexpansion of paper. In order to reduce production instability and to choose and develop paper substrates with ideal characteristics, critical parameters need to be known. This paper offers an extensive overview of those parameters, starting at a molecular and microscopic level with the effect of the constituents and morphology of single fibers, before moving on to paper contents, chemical modifications and additives and finally concluding with paper production and fiber network modification. It was found that the major influences are single fiber sorption, inter-fiber contacts, microfibril angle, fiber morphology (length, width, curliness) and fiber orientation. This review gives new ideas and insights for technologists working in research, development and production optimization of paper-based products.

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Section: Graftingmentioning

confidence: 99%

Factors affecting the hygroexpansion of paper

Lindner

2017

J Mater Sci

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“…When such pressure is targeted/localized, and with the appropriate lubrication to mitigate fiber damage, a channel can be created (Figure 2(a)). We 28,29 and others 5,[30][31][32][33][34][35][36] have shown that paper can be rendered hydrophobic by treatment with alkyl trichlorosilanes (Figures 1(b) and 1(c); see details in the supplementary material Figure S1). 29 We, therefore, hypothesized that co-deposition of an appropriately functionalized silane during the asymmetric calendaring could lead to a channel with desired wetting properties.…”

Section: Introductionmentioning

confidence: 92%

Paper-based microfluidic devices by asymmetric calendaring

et al. 2017

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We report a simple, efficient, one-step, affordable method to produce open-channel paper-based microfluidic channels. One surface of a sheet of paper is selectively calendared, with concomitant hydrophobization, to create the microfluidic channel. Our method involves asymmetric mechanical modification of a paper surface using a rolling ball (ball-point pen) under a controlled amount of applied stress (r z ) to ascertain that only one side is modified. A lubricating solvent (hexane) aids in the selective deformation. The lubricant also serves as a carrier for a perfluoroalkyl trichlorosilane allowing the channel to be made hydrophobic as it is formed. For brevity and clarity, we abbreviated this method as TACH (Targeted Asymmetric Calendaring and Hydrophobization). We demonstrate that TACH can be used to reliably produce channels of variable widths (size of the ball) and depths (number of passes), without affecting the nonworking surface of the paper. Using tomography, we demonstrate that these channels can vary from 10s to 100s of microns in diameter. The created hydrophobic barrier extends around the channel through wicking to ensure no leakages. We demonstrate, through modeling and fabrication, that flow properties of the resulting channels are analogous to conventional devices and are tunable based on associated dimensionless numbers. Published by AIP Publishing. [http://dx

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“…In this study, hydrophobic domains were supposed to be created on the paper surface through AESO reactive coating. The static wetting and surface energy of paper can be determined by the apparent contact angle of a water droplet on the (Samyn 2013). The comparison of water contact angles on different substrates before and after coating is shown in Fig.…”

Section: Water Barrier Propertiesmentioning

confidence: 99%

“…Other methods for hydrophobic modification of cellulose surfaces by chemical, physical and nano-technological methods has tremendously increased over the last years, but they often cannot be simply transferred to paper substrates due to some potential cellulose damages under treatments (Samyn 2013). Surface coating is more effective in enhancing both water resistance and water vapor barrier for paper and paperboard; however, most of the coating materials are nonbiodegradable (polyethylene, polybutylene terephthalate, aluminum foil laminate, etc.)…”

Section: Introductionmentioning

confidence: 99%

Effects of Cellulosic Base Sheet Pore Structure and Soybean Oil-Based Polymer Layer on Cellulosic Packaging Performance as a Barrier for Water and Water Vapor

Lü¹,

Tian²,

Liu³

et al. 2016

BioResources

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Cellulose-based materials are good alternatives to petroleum-based materials in the packaging industry, considering their sufficient mechanical properties and sustainability; however, the barrier performances of cellulosic packaging materials against water and water vapor are generally poor due to the hydrophilic nature of cellulose. In this study, a soybean oilbased polymer was synthesized on the surface of several cellulosic materials through an acrylated-epoxidized soybean oil (AESO) reactive coating. The best conversion of the reaction was observed when a suitable reaction temperature, curing time, initiator dosing, and monomer content were selected. Five different types of cellulosic packaging materials were used as substrates for the reactive coating, and their barrier performances were investigated. The improvement in water barrier properties was indicated by the change in water droplet contact angle (CA). The water vapor permeability (WVP) of the substrates was reduced significantly after coating. The water vapor barrier properties of the coating were highly dependent on the tested substrate. A comparison of CA and WVP showed that the change in water vapor barrier did not correspond to surface hydrophobicity.

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Wetting and hydrophobic modification of cellulose surfaces for paper applications

Cited by 177 publications

References 390 publications

Factors affecting the hygroexpansion of paper

Factors affecting the hygroexpansion of paper

Paper-based microfluidic devices by asymmetric calendaring

Effects of Cellulosic Base Sheet Pore Structure and Soybean Oil-Based Polymer Layer on Cellulosic Packaging Performance as a Barrier for Water and Water Vapor

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