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Publications (10 of 74) Show all publications
Johansson, C. (2016). Bioplastics (2ed.). In: Olabisi, O., Adewale, K. (Ed.), Handbook of Thermoplastics: Second Edition (pp. 835-876). CRC Press
Open this publication in new window or tab >>Bioplastics
2016 (English)In: Handbook of Thermoplastics: Second Edition / [ed] Olabisi, O., Adewale, K., CRC Press, 2016, 2, p. 835-876Chapter in book (Other academic)
Place, publisher, year, edition, pages
CRC Press, 2016 Edition: 2
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-44411 (URN)978-1-4665-7722-0 (ISBN)978-1-4665-7723-7 (ISBN)
Available from: 2016-07-06 Created: 2016-07-06 Last updated: 2016-07-06Bibliographically approved
Bohlin, E., Johansson, C. & Lestelius, M. (2016). Flexographic ink-coating interactions: Effects of latex variations in coating layers. TAPPI Journal, 15(4), 253-262
Open this publication in new window or tab >>Flexographic ink-coating interactions: Effects of latex variations in coating layers
2016 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 15, no 4, p. 253-262Article in journal (Refereed) Published
Place, publisher, year, edition, pages
TAPPI Press, 2016
National Category
Chemical Sciences
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-30027 (URN)000382526700003 ()
Available from: 2013-11-15 Created: 2013-11-15 Last updated: 2017-12-06Bibliographically approved
Zdanowicz, M. & Johansson, C. (2016). Mechanical and barrier properties of starch-based films plasticized with two- or three component deep eutectic solvents. Carbohydrate Polymers, 151, 103-112
Open this publication in new window or tab >>Mechanical and barrier properties of starch-based films plasticized with two- or three component deep eutectic solvents
2016 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 151, p. 103-112Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Elsevier, 2016
Keyword
starch, deep eutectic solvent, plasticizer, mechanical properties, barrier properties, crosslinking
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-44412 (URN)10.1016/j.carbpol.2016.05.061 (DOI)000380943900012 ()27474548 (PubMedID)
Available from: 2016-07-06 Created: 2016-07-06 Last updated: 2017-08-08Bibliographically approved
Johansson, C. & Clegg, F. (2015). Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)-bentonite nanocomposites. Journal of Applied Polymer Science, 132(28), Article ID 42229.
Open this publication in new window or tab >>Effect of clay type on dispersion and barrier properties of hydrophobically modified poly(vinyl alcohol)-bentonite nanocomposites
2015 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 132, no 28, article id 42229Article in journal (Refereed) Published
Abstract [en]

The oxygen and water vapor permeability at high relative humidity was studied for composite films formed by incorporation of three different bentonites (MMT) into an ethylene-modified, water-soluble poly(vinyl alcohol), EPVOH. The oxygen permeability decreased linearly with an increased addition of hydrophilic MMTs. X-ray diffraction and Fourier transform infrared spectroscopy suggested a homogeneous distribution in the thickness direction with disordered and probably exfoliated structures for hydrophilic MMTs. In contrast, organophilic modified clay showed an intercalated structure with the clay preferentially located at the lower film surface, a combination which was however efficient in reducing the water vapor- and oxygen permeabilities at low addition levels. Composite films of EPVOH and Na+-exchanged MMT resulted in high resistance to dissolution in water, which was ascribed to strong interactions between the components resulting from matching polarities. Annealing the films at 120 degrees C resulted in enhanced resistance to water dissolution and a further reduction in oxygen permeability.

Place, publisher, year, edition, pages
John Wiley & Sons, 2015
Keyword
clay, composites, films, packaging, surfaces and interfaces
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-37296 (URN)10.1002/app.42229 (DOI)000353964000010 ()
Available from: 2015-08-06 Created: 2015-08-06 Last updated: 2017-12-04Bibliographically approved
Johansson, C. & Clegg, F. (2015). Hydrophobically modified poly (vinyl alcohol) and bentonite nanocomposites thereof: Barrier, mechanical, and aesthetic properties. Journal of Applied Polymer Science, 132(13), 41737
Open this publication in new window or tab >>Hydrophobically modified poly (vinyl alcohol) and bentonite nanocomposites thereof: Barrier, mechanical, and aesthetic properties
2015 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 132, no 13, p. 41737-Article in journal (Refereed) Published
Abstract [en]

Composite films were formed by incorporating three different bentonites into an ethylene modified, water-soluble poly(vinyl alcohol), EPVOH. The interaction of EPVOH with both hydrophilic and hydrophobic bentonites was investigated. EPVOH provided lower water vapor and oxygen transmission rates compared to a conventional PVOH grade when exposed at high relative humidities (70–90% RH). EPVOH films which exhibited oxygen barrier properties comparable to that of a biaxially oriented PET packaging film at 80% RH were produced. High compatibility between EPVOH and hydrophilic bentonites provided an even distribution of clay platelets in the composites. A strong increase in Young's modulus with increased addition of any of the three bentonites was found. At low addition levels the hydrophobic bentonite proved to be effective in terms of maintaining high elongation at break, high transparency and high gloss

Place, publisher, year, edition, pages
Wiley-Blackwell, 2015
Keyword
clay, composites, films, mechanical properties, packaging
National Category
Engineering and Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-35784 (URN)10.1002/app.41737 (DOI)000347464200024 ()
Available from: 2015-04-08 Created: 2015-04-08 Last updated: 2017-08-08Bibliographically approved
Olsson, E., Johansson, C. & Järnström, L. (2015). Impact of dispersing agents on the flow behaviour of montmorillonite-starch coating formulations. In: Annual Transactions of the Nordic Rheology Society: . Paper presented at 24th Nordic Rheology Conference, August 19-20, 2015, Karlstad (pp. 143-150). The Nordic Reology Society, 23
Open this publication in new window or tab >>Impact of dispersing agents on the flow behaviour of montmorillonite-starch coating formulations
2015 (English)In: Annual Transactions of the Nordic Rheology Society, The Nordic Reology Society , 2015, Vol. 23, p. 143-150Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
The Nordic Reology Society, 2015
Series
Annual Transactions of the Nordic Rheology Society, ISSN 1601-4057 ; 2015
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-44413 (URN)978-91-637-9104-8 (ISBN)
Conference
24th Nordic Rheology Conference, August 19-20, 2015, Karlstad
Available from: 2016-07-06 Created: 2016-07-06 Last updated: 2016-07-06Bibliographically approved
Järnström, L., Olsson, E., Menzel, C., Johansson, C., Koch, K. & Andersson, R. (2014). Cross-linked starch films for barrier coatings. In: : . Paper presented at Conference of 13th TAPPI Advanced Coating Fundamentals Symposium 2014 ; Conference Date: 7 October 2014 Through 9 October 2014 (pp. 134-148).
Open this publication in new window or tab >>Cross-linked starch films for barrier coatings
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2014 (English)Conference paper, Published paper (Refereed)
Keyword
Cross-linking, starch films, barrier coatings
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-43171 (URN)2-s2.0-84942567664 (Scopus ID)978-151080129-5 (ISBN)
Conference
Conference of 13th TAPPI Advanced Coating Fundamentals Symposium 2014 ; Conference Date: 7 October 2014 Through 9 October 2014
Available from: 2016-06-30 Created: 2016-06-15 Last updated: 2016-06-30Bibliographically approved
Johansson, K., Kotkamo, S., Rotabakk, B. T., Johansson, C., Kuusipalo, J., Jönsson, L. J. & Järnström, L. (2014). Extruded polymer films for optimal enzyme-catalyzed oxygen scavenging. Chemical Engineering Science, 108, 1-8
Open this publication in new window or tab >>Extruded polymer films for optimal enzyme-catalyzed oxygen scavenging
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2014 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 108, p. 1-8Article in journal (Refereed) Published
Abstract [en]

The use of enzymes as oxygen scavengers has a great potential in the food packaging industry. Enzymes can be incorporated into a coating layer that can be applied directly onto the packaging material. For the system to be fully functional, there is however a need for the packaging to have some barrier properties, to be sealable through heat, and to ensure low or no migration of the active coating to the food. Various combinations of the polypropylene (PP), poly(lactic acid) (PLA) and low density polyethylene (LDPE) were extruded onto board coated with the oxygen-scavenging enzyme. Properties such as oxygen-transmission rate, water-vapor transmission rate, heat-sealability, migration and oxygen scavenging capacity were evaluated. All combinations of extruded material resulted in a packaging material able to scavenge the oxygen at both 84% and 100% relative humidity. The greatest decrease in oxygen concentration of the head space of air-tight chambers was achieved with the material extruded with PLA on at least one side. It was found that the extruded plastic is necessary in order to meet the EU directives on migration from food packaging materials of not more than a total of 10 mg/dm2 material. All plastics were heat sealable against themselves but not against any of the other plastics and only LDPE adhered strongly to the enzyme-containing coating

Place, publisher, year, edition, pages
Amsterdam: Elsevier, 2014
Keyword
Oxygen scavenging, glucose oxidase, water vapor, migration, extrusion coating
National Category
Chemical Engineering Industrial Biotechnology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-28460 (URN)10.1016/j.ces.2013.12.035 (DOI)000332392100001 ()
Available from: 2013-07-08 Created: 2013-07-08 Last updated: 2017-12-06Bibliographically approved
Bohlin, E., Johansson, C. & Lestelius, M. (2014). Flexographic ink-coating interactions: effects of kaolin clay/GCCblends in coating layers. In: : . Paper presented at 41st International Research Conference of IARIGAI on Advances in Printing and Media Technology, September 7-10, Swansea, UK, 2014.
Open this publication in new window or tab >>Flexographic ink-coating interactions: effects of kaolin clay/GCCblends in coating layers
2014 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-34298 (URN)
Conference
41st International Research Conference of IARIGAI on Advances in Printing and Media Technology, September 7-10, Swansea, UK, 2014
Available from: 2014-10-13 Created: 2014-10-13 Last updated: 2015-03-02Bibliographically approved
Olsson, E., Johansson, C. & Järnström, L. (2014). Montmorillonite clay for starch-based barrier dispersion coating: Part 1 The influence of citric acid on viscosity and barrier properties. Applied Clay Science, 160-166
Open this publication in new window or tab >>Montmorillonite clay for starch-based barrier dispersion coating: Part 1 The influence of citric acid on viscosity and barrier properties
2014 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, p. 160-166Article in journal (Refereed) Published
Abstract [en]

Starch-based coating formulations were draw-down coated on a paper substrate and the effect on the water vapor transmission rate, WVTR, upon montmorillonite addition was compared to that of the pure the starch matrix without added plasticizer and for poly(ethylene glycol), PEG, and citric acid, CA, as potential plasticizers. Both potential plasticizers were added at a ratio of 3 to 10 to starch. Addition of CA to the starch solution substantially lowered the WVTR of the coated papers compared to coating with a pure starch or PEG-plasticized coating. The WVTR of the papers coated with starch and CA was lower than that obtained for paper coated with non-plasticized montmorillonite-starch dispersions, and approximately similar to paper coated with montmorillonite-starch dispersions plasticized with PEG or with citric acid. Addition of montmorillointe was effective in reducing the WVTR in the case of PEG-plasticized starch but not in the case of CA. These differences in WVTR were indicated to be due to differences in the viscosity and the clay swelling indicating that CA and PEG affected the state of dispersion differently. CA was also investigated as a dispersing agent by addition in small quantities to the montmorillonite dispersion at different pH values. When this clay dispersion was added to a suspension already containing PEG, CA gave slightly reduced plastic viscosity and there was also a weak correlation between low plastic viscosity and WVTR.

Place, publisher, year, edition, pages
Elsevier, 2014
Keyword
Starch; Montmorillonite; Citric acid; Poly(ethylene glycol); Rheology; Barrier properties
National Category
Polymer Technologies
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-27110 (URN)10.1016/j.clay.2014.04.040 (DOI)000340302200022 ()
Projects
Renewable Functional Barriers
Funder
VINNOVA
Available from: 2013-04-28 Created: 2013-04-28 Last updated: 2017-12-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7368-7227

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