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Publications (10 of 256) Show all publications
Javed, A., Rättö, P., Järnström, L. & Ullsten, H. (2018). Lignin-containing coatings for packaging materials-pilot trials. Nordic Pulp & Paper Research Journal, 33(3), 548-556
Open this publication in new window or tab >>Lignin-containing coatings for packaging materials-pilot trials
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 3, p. 548-556Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Walter de Gruyter, 2018
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-66852 (URN)10.1515/npprj-2018-3042 (DOI)
Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-09-13Bibliographically approved
Petkova-Olsson, Y., Oelschlaeger, C., Ullsten, H. & Järnström, L. (2018). Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system. Journal of Colloid and Interface Science, 514, 459-467
Open this publication in new window or tab >>Structural, microrheological and kinetic properties of a ternary silica-Pluronic F127-starch thermosensitive system
2018 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 514, p. 459-467Article in journal (Refereed) Published
Abstract [en]

Hypothesis: The sol-gel transition in aqueous suspensions consisting of silica particles and thermosensitive polymer is controlled by inter-particle forces and solution properties of the polymer. Addition of a second non-thermosensitive polymer may affect the transition. The purpose of this work was to characterize the kinetics of the sol-gel transition and to understand the effects of a second non-thermosensitive polymer on the microstructure, using a combination of classical rheology and microrheology. Experiments: Classical rotational rheology as well as two microrheology methods, Multiple Particle Tracking (MPT) and Diffusing Wave Spectroscopy (DWS), were used to investigate the sol-gel transition of a ternary silica-Pluronic F127-starch thermosensitive system. Findings: Classical rheometry and DWS indicated sol-gel transition temperature similar to 25 degrees C at 1 wt% Pluronic, independently of the concentration of the other components. DWS showed a fast gelation process, less than two minutes for all samples, beside a second slow kinetic process. In the gel state, MPT indicated micro-structural and micro-viscoelastic differences compared to rotational rheology. This was explained by formation of an elastic matrix of silica and polymers in combination with assembly of silica particles in large macroporous agglomerates. Presence of starch led to breakdown of the macro porous network, leaving the homogeneous elastic network left.

Place, publisher, year, edition, pages
Academic Press, 2018
Keywords
Thermosensitive; Silica-pluronic-starch; Sol-gel transition; Kinetic; Microrheology; Microstructure
National Category
Chemical Sciences
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-66616 (URN)10.1016/j.jcis.2017.12.051 (DOI)000424963700050 ()29289030 (PubMedID)
Available from: 2018-03-08 Created: 2018-03-08 Last updated: 2018-08-15Bibliographically approved
Christophliemk, H., Andersson, C., Ullsten, H. & Järnström, L. (2017). Oxygen and water vapor transmission rates of starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper. Progress in organic coatings, 113, 218-224
Open this publication in new window or tab >>Oxygen and water vapor transmission rates of starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper
2017 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 113, p. 218-224Article in journal (Refereed) Published
Abstract [en]

Creating efficient water-borne dispersions based mainly on renewable materials for coating of flexible packaging paper was the aim of this study. The effects of an ethylene modified poly(vinyl alcohol) grade and a standard poly(vinyl alcohol) on the oxygen and water vapor barrier performance of corn starch and potato starch coatings was studied. The results showed that a coating composition with a high fraction of a renewable polymer was effective in keeping the oxygen barrier at a technically and commercially applicable level. An ethylene modified poly(vinyl alcohol) grade was found to provide lower oxygen transmission rates at high relative humidity, as compared to a standard poly(vinyl alcohol) grade. The oxygen barrier properties of blends of starch and poly (vinyl alcohol) were similar to that of the pure modified poly(vinyl alcohol) in the range from 0% starch to 60% starch. This was observed with both hydroxypropylated and octenyl succinate modified starch grades. The drying conditions of the mixed starch:poly(vinyl alcohol) coatings were based on drying trials with pure poly (vinyl alcohol) coatings. Drying at moderate temperatures indicated the possibility to slightly decrease water vapor transmission rate by higher drying temperature. Several secondary effects of increased drying temperature such as coating hold-out and formation of defects may also be of importance.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-65894 (URN)10.1016/j.porgcoat2017.04.019 (DOI)000414114700024 ()
Funder
EU, FP7, Seventh Framework Programme
Available from: 2018-01-25 Created: 2018-01-25 Last updated: 2018-07-04Bibliographically approved
Lestelius, M., Nyflött, Å., Moons, E., Järnström, L., Carlsson, G., Bonnerup, C. & Govindarajan, V. (2017). Oxygen permeabilityand economic-environmental impact studies of some polyvinyl alcohol dispersionbarrier coatings for packaging applications. In: : . Paper presented at PTS Coating Symposium, September 5-6, Munich, Germany.
Open this publication in new window or tab >>Oxygen permeabilityand economic-environmental impact studies of some polyvinyl alcohol dispersionbarrier coatings for packaging applications
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2017 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Purposes of employing barrier coatings in packaging, and in particular food packaging, can be to increase the shelf life, preserve colour, odour, and taste, and to protect from a harmful environment in general. Barrier coatings can thus help to reduce food waste along the value chain until end use. Including both materials choice for packaging and the possible fates of the used package, even further steps to provide greater knowledge for decisions on choices of packaging solutions. To that end, we have conducted several experimental and transport modeling studies on oxygen barrier coatings performance. The coating system of choice    has been dispersion coatings of poly vinyl alcohol (PVOH), with additions of kaolin. Physical and chemical features of the coatings were characterized to obtain information on polymer crystallinity, free volume and filler orientation as these characteristics are influential to the oxygen mass transport performance. In turn, the oxygen mass transport was also measured, both in steady state and dynamically. In so doing, we obtained information    useful for developing a general model to describe the oxygen permeability taking into account the physical and chemical features, described above, of the coating layer. Attempts on describing the interdependence and impact, for instance between crystalline and amorphous polymer regions and moisture, was added to the model. The model showed agreement to experimental data for PVOH-kaolin coating in this particular case. However, the basic permeability model has been applied to  many different polymers.

To further explore the potential of these types of coating, which are technically possible to    produce in paperboard production, an economic-environmental impact comparison to other existing material solutions was made. Four barrier material alternatives – starch, polyethylene, ethyl vinyl alcohol (chosen as an alternative for PVOH, where data was difficult to obtain) and kaolin, and latex and kaolin, were analyzed with respect to cost and global warming potential. Weighting and comparing cost to environmental aspect, weighting    factors based on interviews with experts in the packaging value chain, starch emerges as the most sustainable alternative. However, previous coating and mass transport studies also shows how these renewable materials require some further technical development to be competitive.

The mass transport model can serve as a tool for customizing barrier coatings and to predict the barrier performance, as permeability is obtained and thus shelf-life estimation is    possible. The overall concept, the combination of assessment of structural performance and the environmental studies, can be employed to find sustainable food packaging solutions.

National Category
Paper, Pulp and Fiber Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-63024 (URN)
Conference
PTS Coating Symposium, September 5-6, Munich, Germany
Projects
VIPP
Funder
Knowledge FoundationStora Enso
Available from: 2017-09-11 Created: 2017-09-11 Last updated: 2018-06-25Bibliographically approved
Christophliemk, H., Ullsten, H., Johansson, C. & Järnström, L. (2017). Starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper and their effects of phase interactions. Progress in organic coatings, 111, 13-22
Open this publication in new window or tab >>Starch-poly(vinyl alcohol) barrier coatings for flexible packaging paper and their effects of phase interactions
2017 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 111, p. 13-22Article in journal (Refereed) Published
Abstract [en]

Starch and poly(vinyl alcohol) based barrier coatings for flexible packaging papers were studied. Both octenyl succinate modified and hydroxypropylated corn and potato starches were blended with regular and ethylene modified poly(vinyl alcohol) to increase the water vapor barrier properties and enhance the flexibility of the starch coatings, in order to accomplish superior barrier performance. Phase separation between starch and poly (vinyl alcohol) was studied in detail, both in the solution and in dry draw-down coatings on paper. The barrier performance of the coated paper was evaluated with respect to water vapor transmission rate. Conditions for the creation of a thin surface layer consisting of only one of the pure polymers were identified and discussed in terms of phase separation in solution migration of poly(vinyl alcohol) to the uppermost surface layer. The phase separation promoted low water vapor transmission rates also with a rather high fraction of starch in the coatings

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Polymer Chemistry Polymer Technologies Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kau:diva-65723 (URN)10.1016/j.porgcoat.2017.04.018 (DOI)000407184600002 ()
Available from: 2018-01-18 Created: 2018-01-18 Last updated: 2018-07-04Bibliographically approved
Petkova-Olsson, Y., Altun, S., Ullsten, H. & Järnström, L. (2017). Temperature effect on the complex formation between Pluronic F127 and starch. Carbohydrate Polymers, 166, 264-270
Open this publication in new window or tab >>Temperature effect on the complex formation between Pluronic F127 and starch
2017 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 166, p. 264-270Article in journal (Refereed) Published
Abstract [en]

In this study a systematic investigation of the temperature effect on the interactions between Pluronic F127 and hydroxypropylated oxidised potato starch by surface tension titrations and quartz crystal microbalance (QCM) analysis is presented. The binary mixture examined was subjected to 20 degrees C and 30 degrees C and the results indicated no presence of binary complexes at the lower temperature. However, at elevated temperature, an ability for inclusion complex formation was detected by the here used independent techniques. The formed inclusion complexes at 30 degrees C are presumably a product of hydrophobic interaction between Pluronic F127 and starch, where starch acts as a host molecule and Pluronic F127 due to its increased hydrophobicity is the guest molecule in this complex. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2017
Keywords
Starch, Pluronic F127, Inclusion complex, Quartz crystal microbalance
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-65477 (URN)10.1016/j.carbpol.2017.02.012 (DOI)000400213300029 ()28385232 (PubMedID)
Available from: 2017-12-29 Created: 2017-12-29 Last updated: 2018-06-26Bibliographically approved
Nyflött, Å., Meriçer, Ç., Minelli, M., Moons, E., Jarnstrom, L., Lestelius, M. & Giacinti Baschetti, M. (2017). The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen. JCT Research, 1345-1355
Open this publication in new window or tab >>The influence of moisture content on the polymer structure of polyvinyl alcohol in dispersion barrier coatings and its effect on the mass transport of oxygen
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2017 (English)In: JCT Research, ISSN 1547-0091, E-ISSN 2168-8028, p. 1345-1355Article in journal (Refereed) Published
Abstract [en]

This paper presents a study of the effect of moisture on the gas permeability of polyvinyl alcohol (PVOH) and PVOH–kaolin dispersion barrier coatings. The oxygen permeability was measured at different humidity levels, and the material properties were characterized under the same conditions: polymer crystallinity, kaolin concentration, and kaolin orientation were all evaluated. The experimental results revealed that the water plasticizes the PVOH material of the coatings, and the presence of kaolin filler is unable to affect such behavior significantly. The PVOH crystallinity was affected drastically by the humidity, as water melts polymer crystallites, which is a reversible process under removal of water. The permeability data were analyzed using a thermodynamicbased model able to account for the water effect on both the solubility of the gas and the diffusivity coefficients in the polymer and composite. The results showed good agreement between the model’s predictions and the experimental data in terms of the overall permeability of the material.

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Mass transport, Permeability, Modeling, Barrier coating, Moisture, Kaolin, PVOH
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-47462 (URN)10.1007/s11998-017-9937-2 (DOI)
Funder
Knowledge Foundation, 20100268Stora Enso
Available from: 2016-12-13 Created: 2016-12-07 Last updated: 2018-06-12Bibliographically approved
Javed, A., Ullsten, H. & Järnström, L. (2016). Effects on Oxygen-barrier Properties of Pretreating Paperboard with a Starch–Poly(Vinyl Alcohol) Blend before Polyethylene Extrusion. Packaging technology and science
Open this publication in new window or tab >>Effects on Oxygen-barrier Properties of Pretreating Paperboard with a Starch–Poly(Vinyl Alcohol) Blend before Polyethylene Extrusion
2016 (English)In: Packaging technology and science, ISSN 0894-3214Article in journal (Refereed) Published
Place, publisher, year, edition, pages
John Wiley & Sons, 2016
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-38336 (URN)10.1002/pts.2210 (DOI)
Note

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Available from: 2015-11-06 Created: 2015-11-06 Last updated: 2018-03-26Bibliographically approved
Javed, A., Ullsten, H., Ernstsson, M. & Järnström, L. (2016). Study of starch and starch-PVOH blends and effects of plasticizers on mechanical and barrier properties of coated paperboard. Nordic Pulp & Paper Research Journal, 31(3), 499-510
Open this publication in new window or tab >>Study of starch and starch-PVOH blends and effects of plasticizers on mechanical and barrier properties of coated paperboard
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 3, p. 499-510Article in journal (Refereed) Published
Abstract [en]

The mechanical properties of self-supporting films based on starch-plasticizer and starch-PVOH-plasticizer and the barrier properties of paperboard coated with solutions of these polymers have been studied. The plasticizers used were glycerol, polyethylene glycol and citric acid. It was shown that the addition of a plasticizer and PVOH to starch substantially increases the flexibility of starch films. It was seen that curing the self-supporting films led to a decrease in flexibility. After heat-treatment, a substantial increase in storage modulus was observed only in the starch-PVOH-citric-acid blend films. Tensile tests on the films indicate that citric acid did not cause any noticeable phase separation. Citric acid acted as a compatibilizer for starch-PVOH blends even though a similar enrichment of PVOH at the air-solid interface was observed with both citric acid and polyethylene glycol as plasticizer. The properties of barrier coatings greatly reflected the compatibility of starch-PVOH blends containing citric acid. The only plasticizer that resulted in a lower water vapour transmission rate through the starch and starch-PVOH coatings was citric acid, which suggests that cross-linking took place. With four layers, coatings based of starch-PVOH possessed the same oxygen-transmission rate with citric acid as without citric acid.

Place, publisher, year, edition, pages
AB SVENSK PAPPERSTIDNING, 2016
Keywords
Citric acid; Glycerol; Polyethylene glycol; Barrier coatings; Starch; Mechanical properties
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-38334 (URN)000387976000010 ()
Available from: 2015-11-06 Created: 2015-11-06 Last updated: 2018-03-26Bibliographically approved
Nyflött, Å., Moons, E., Bonnerup, C., Gunilla, C., Järnström, L. & Lestelius, M. (2016). The influence of clay orientation and crystallinity on oxygen permeation in dispersion barrier coatings. Applied Clay Science, 126, 17-24
Open this publication in new window or tab >>The influence of clay orientation and crystallinity on oxygen permeation in dispersion barrier coatings
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2016 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 126, p. 17-24Article in journal (Refereed) Published
Abstract [en]

In this study oxygen permeability in dispersion barriers produced from poly(vinyl alcohol) (PVOH) and kaolin clay blends coated onto polymeric supports was investigated. To determine the oxygen permeability, two measurement methods were used: the oxygen transmission rate (OTR) and the ambient oxygen ingress rate (AOIR). It was found that with increasing kaolin content the oxygen permeability increased, up to about 5 wt% kaolin, whereafter the oxygen permeability decreased, as was expected. The increased (> 5%) kaolin loading lowered the diffusion because of an increased tortuosity. Structural information about the dispersion-barrier coatings, such as kaolin orientation and polymer crystallinity, was obtained from Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Kaolin orientation was influenced by the drying temperature, the thickness of the samples, and the kaolin concentration. The polymer crystallinity increased in thicker samples. The drying temperature did not show any clear effect on the crystallinity of thin samples, while for the thicker barriers, combined with a kaolin concentration lower than 20 wt%, a higher crystallinity was achieved at lower drying temperatures. This study demonstrates the strong influence of chemical and physical structures on the permeability of the investigated coatings.

Keywords
Barrier coating; Kaolin; Polyvinyl alcohol; Permeability; Dynamic mass transport; Crystallinity; Kaolin orientation
National Category
Chemical Engineering
Research subject
Materials Engineering
Identifiers
urn:nbn:se:kau:diva-41069 (URN)10.1016/j.clay.2016.02.029 (DOI)000376213900003 ()
Funder
Knowledge Foundation, 20100268
Available from: 2016-03-16 Created: 2016-03-16 Last updated: 2017-11-30Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1256-1708

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