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Publications (6 of 6) Show all publications
Carlmark, A. (2019). A polymeric coat for nanodroplets. Nature Nanotechnology
Open this publication in new window or tab >>A polymeric coat for nanodroplets
2019 (English)In: Nature Nanotechnology, ISSN 1748-3387, E-ISSN 1748-3395Article in journal, Editorial material (Refereed) Epub ahead of print
Abstract [en]

Grafting nanodroplets by surface-initiated atom transfer radical polymerization can be carried out at liquid–liquid interfaces.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
Keywords
atom transfer radical polymerization, note
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-39060 (URN)10.1038/s41565-019-0469-z (DOI)2-s2.0-85066914599 (Scopus ID)
Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved
Träger, A., Klein, G., Carrick, C., Pettersson, T., Johansson, M., Wågberg, L., . . . Carlmark, A. (2019). Macroscopic cellulose probes for the measurement of polymer grafted surfaces. Cellulose (London), 26(3), 1467-1477
Open this publication in new window or tab >>Macroscopic cellulose probes for the measurement of polymer grafted surfaces
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2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 26, no 3, p. 1467-1477Article in journal (Refereed) Published
Abstract [en]

Abstract: A synthesis protocol was identified to produce covalent grafting of poly(dimethyl siloxane) from cellulose, based on prior studies of analogous ring opening polymerizations. Following this polymer modification of cellulose, the contact adhesion was anticipated to be modified and varied as a function of the polymer molecular mass. The synthetic details were optimized for a filter paper surface before grafting the polymer from bulk cellulose spheres. The adhesion of the unmodified and grafted, bulk cellulose spheres were evaluated using the Johnson–Kendall–Roberts (JKR) theory with a custom build contact adhesion testing setup. We report the first example of grafting poly(dimethyl siloxane) directly from bulk cellulose using ring opening polymerization. For short grafting lengths, both the JKR work of adhesion and the adhesion energy at the critical energy release rate (Gc) were comparable to unmodified cellulose beads. When polymer grafting lengths were extended sufficiently where chain entanglements occur, both the JKR work of adhesion and Gc were increased by as much as 190%. Given the multitude of options available to graft polymers from cellulose, this study shows the potential to use this type of cellulose spheres to study the interaction between different polymer surfaces in a controlled manner. Graphical abstract: [Figure not available: see fulltext.].

Keywords
Adhesion, Cellulose, Contact mechanics, Grafted polymer, Johnson–Kendall–Roberts theory, Deformation, Grafting (chemical), Spheres, Chain entanglements, Critical energy release rate, Grafted polymers, Polymer modifications, Polymer molecular mass, Polymer-grafted surfaces, Roberts, Ring opening polymerization
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-37019 (URN)10.1007/s10570-018-2196-2 (DOI)2-s2.0-85059323425 (Scopus ID)
Available from: 2019-01-17 Created: 2019-01-17 Last updated: 2019-07-01Bibliographically approved
Träger, A., Carlmark, A. & Wågberg, L. (2018). Interpenetrated Networks of Nanocellulose and Polyacrylamide with Excellent Mechanical and Absorptive Properties. Macromolecular materials and engineering (Print), 303(5), Article ID 1700594.
Open this publication in new window or tab >>Interpenetrated Networks of Nanocellulose and Polyacrylamide with Excellent Mechanical and Absorptive Properties
2018 (English)In: Macromolecular materials and engineering (Print), ISSN 1438-7492, E-ISSN 1439-2054, Vol. 303, no 5, article id 1700594Article in journal (Refereed) Published
Abstract [en]

Composites based on interpenetrating networks (IPNs) of cellulose nanofibril (CNF) aerogels and polyacrylamide are prepared and exhibit robust mechanical, water retaining, and re-swelling capacities. Furthermore, their swelling behavior is not affected by an increased ionic strength of the aqueous phase. These unprecedented IPNs combine the water retaining capacity of the polyacrylamide with the mechanical strength provided by the CNF aerogel template. The CNF aerogel/polyacrylamide composites exhibit a compressive stress at break greater than 250% compared with a neat polyacrylamide hydrogel. Furthermore, the composites retain their wet compression properties after drying and re-swelling, whereas the neat polyacrylamide hydrogels fail at a significantly lower stress and strain after drying and re-swelling. These composite materials highlight the potential of CNF aerogels to strengthen the mechanical properties and reduce the number of fracture defects during the drying and re-swelling of a hydrogel. These composites show the potential of being optimized for a plethora of applications, especially in the hygiene field and for biomedical devices. 

Keywords
CNF aerogels, composites, hydrogels, polyacrylamide, Aerogels, Cellulose, Composite materials, Drying, Fracture, Interpenetrating polymer networks, Ionic strength, Nanocellulose, Polyacrylates, Swelling, Biomedical devices, Fracture defects, Interpenetrated networks, Polyacrylamide hydrogels, Swelling behavior, Swelling capacities, Water retaining, Wet compression
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-33900 (URN)10.1002/mame.201700594 (DOI)2-s2.0-85046904921 (Scopus ID)
Note

 Funding details: Core; Funding details: VR, Vetenskapsrådet

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2019-06-20Bibliographically approved
Carlmark, A. (2018). Modification of nanocellulose with tailored latex nanoparticles. In: Recent advances in cellulose nanotechnology research: production, characterization and applications. Paper presented at Recent advances in cellulose nanotechnology research, Trondheim, Norway, 26-27 September, 2018. Trondheim: RISE PFI
Open this publication in new window or tab >>Modification of nanocellulose with tailored latex nanoparticles
2018 (English)In: Recent advances in cellulose nanotechnology research: production, characterization and applications, Trondheim: RISE PFI , 2018Conference paper, Oral presentation only (Other academic)
Place, publisher, year, edition, pages
Trondheim: RISE PFI, 2018
Keywords
nanocellulose, latex
National Category
Nano Technology Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-35316 (URN)
Conference
Recent advances in cellulose nanotechnology research, Trondheim, Norway, 26-27 September, 2018
Note

Powerpoint-bilder

Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2019-06-20Bibliographically approved
Carlsson, L., Ingverud, T., Blomberg, H., Carlmark, A., Larsson, P. T. & Malmström, E. (2015). Surface characteristics of cellulose nanoparticles grafted by surface-initiated ring-opening polymerization of ε-caprolactone. Cellulose (London), 22(2), 1063-1074
Open this publication in new window or tab >>Surface characteristics of cellulose nanoparticles grafted by surface-initiated ring-opening polymerization of ε-caprolactone
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2015 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 22, no 2, p. 1063-1074Article in journal (Refereed) Published
Abstract [en]

In this study, surface-initiated ring-opening polymerization has been employed for the grafting of e-caprolactone from cellulose nanoparticles, made by partial hydrolysis of cellulose cotton linters. A sacrificial initiator was employed during the grafting reactions, to form free polymer in parallel to the grafting reaction. The degree of polymerization of the polymer grafts, and of the free polymer, was varied by varying the reaction time. The aim of this study was to estimate the cellulose nanoparticle degree of surface substitution at different reaction times. This was accomplished by combining measurement results from spectroscopy and chromatography. The prepared cellulose nanoparticles were shown to have 3.1 (±0.3) % of the total anhydroglucose unit content present at the cellulose nanoparticle surfaces. This effectively limits the amount of cellulose that can be targeted by the SI-ROP reactions. For a certain SIROP reaction time, it was assumed that the resulting degree of polymerization (DP) of the grafts and the DP of the free polymer were equal. Based on this assumption it was shown that the cellulose nanoparticle surface degree of substitution remained approximately constant (3–7 %) and seemingly independent of SI-ROP reaction time. We believe this work to be an important step towards a deeper understanding of the processes and properties controlling SI-ROP reactions occurring at cellulose surfaces.

Keywords
Cellulose, Cotton linters, Degree of substitution, Ring-opening polymerization, Solid-state cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance (CP/MAS 13C-NMR), Surface grafting
National Category
Nano Technology
Identifiers
urn:nbn:se:ri:diva-786 (URN)10.1007/s10570-014-0510-1 (DOI)2-s2.0-84925536313 (Scopus ID)
Available from: 2016-10-25 Created: 2016-08-03 Last updated: 2019-07-09Bibliographically approved
Östmark, E., Nyström, D., Lindqvist, J., Carlmark, A. & Malmström, E. (2008). Hydroxypropyl cellulose as multifunctional initiator for controlled polymerizations (ed.). Polymer Preprints, 49(2), 585-586
Open this publication in new window or tab >>Hydroxypropyl cellulose as multifunctional initiator for controlled polymerizations
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2008 (English)In: Polymer Preprints, ISSN 0032-3934, Vol. 49, no 2, p. 585-586Article in journal (Refereed) Published
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-6079 (URN)9278 (Local ID)9278 (Archive number)9278 (OAI)
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2019-06-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8194-0058

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