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Olsen, Peter
Alternative names
Publications (5 of 5) Show all publications
Yang, X., Reid, M. S., Olsén, P. & Berglund, L. A. (2020). Eco-Friendly Cellulose Nanofibrils Designed by Nature: Effects from Preserving Native State. ACS Nano, 14(1), 724-735
Open this publication in new window or tab >>Eco-Friendly Cellulose Nanofibrils Designed by Nature: Effects from Preserving Native State
2020 (English)In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 14, no 1, p. 724-735Article in journal (Refereed) Published
Abstract [en]

Cellulose nanofibrils (CNFs) show high modulus and strength and are already used in industrial applications. Mechanical properties of neat CNF films or CNF-polymer matrix nanocomposites are usually much better than for polymer matrix composite films reinforced by clay, graphene, graphene oxide, or carbon nanotubes. In order to obtain small CNF diameter and colloidal stability, chemical modification has so far been necessary, but this increases cost and reduces eco-friendly attributes. In this study, an unmodified holocellulose CNF (Holo-CNF) with small diameter is obtained from mildly peracetic acid delignified wood fibers. CNF is readily defibrillated by low-energy kitchen blender processing. The hemicellulose coating on individual fibrils in the wood plant cell wall is largely preserved in Holo-CNF. This "native" CNF shows well-preserved native fibril structure in terms of length (similar to 2.1 mu m), diameter (<5 nm), high crystallinity, high cellulose molar mass, electronegative charge, and limited mechanical processing damage. The hemicellulose coating contributes mechanical properties and high optical transmittance for CNF nanopaper, which can otherwise only be achieved with chemically modified CNFs. The CNF nanopaper shows superior mechanical properties with a Young's modulus of 21 GPa and an ultimate strength of 320 MPa. Moreover, hemicellulose imparts recyclability from the dried state. Altogether, this native CNF represents a class of colloidally stable, eco-friendly, low-cost CNF of small diameter for large-scale applications of nanopaper and nanomaterials.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2020
Keywords
nanocellulose, hemicellulose, cellulose nanopaper films, redisperse, polymer grafting
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-268775 (URN)10.1021/acsnano.9b07659 (DOI)000510531500063 ()31886646 (PubMedID)2-s2.0-85078763556 (Scopus ID)
Note

QC 20200226

Available from: 2020-02-26 Created: 2020-02-26 Last updated: 2020-02-26Bibliographically approved
Olsen, P., Herrera, N. & Berglund, L. (2020). Polymer Grafting Inside Wood Cellulose Fibers by Improved Hydroxyl Accessibility from Fiber Swelling. Biomacromolecules, 21(2), 597-603
Open this publication in new window or tab >>Polymer Grafting Inside Wood Cellulose Fibers by Improved Hydroxyl Accessibility from Fiber Swelling
2020 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 21, no 2, p. 597-603Article in journal (Refereed) Published
Abstract [en]

Chemical modification of wood cellulose fibers is important for tailored wood-polymer interfaces, reduced moisture sorption, and novel grades of chemical wood pulp. The present study shows how the reaction solvent system influences hydroxyl accessibility during chemical fiber modification. Surface initiated ring-opening polymerization of e-caprolactone from wood cellulose fibers was investigated in a wide range of solvent systems. The hydrogen bond donor strength of the solvent increased graft density and the amount of grafted polycaprolactone (PCL) on the fiber surface, and on nanoscale fibrils inside the fiber. Specifically, the reaction system with acetic acid as a new, green solvent for cellulose grafting increased graft density 24 times compared to bulk polymerization conditions. The results show relationships between solvent properties, hydroxyl accessibility, and grafting results in cellulosic plant fibers. The study clarifies the opportunities provided by controlling the interior of the cellulosic plant fiber cell wall during chemical modification so that the fiber becomes a swollen cellulose nanofibril gel.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2020
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-269470 (URN)10.1021/acs.biomac.9b01333 (DOI)000513091100031 ()31769663 (PubMedID)2-s2.0-85076508296 (Scopus ID)
Note

QC 20200310

Available from: 2020-03-10 Created: 2020-03-10 Last updated: 2020-03-10Bibliographically approved
Stamm, A., Biundo, A., Schmidt, B., Brücher, J., Lundmark, S., Olsén, P., . . . Syrén, P.-O. (2019). A retrobiosynthesis-based route to generate pinene-derived polyesters. ChemBioChem (Print), 20, 1664-1671
Open this publication in new window or tab >>A retrobiosynthesis-based route to generate pinene-derived polyesters
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2019 (English)In: ChemBioChem (Print), ISSN 1439-4227, E-ISSN 1439-7633, Vol. 20, p. 1664-1671Article in journal (Refereed) Published
Abstract [en]

Significantly increased production of biobased polymers is aprerequisite to replace petroleum-based materials towardsreaching a circular bioeconomy. However, many renewablebuilding blocks from wood and other plant material are notdirectly amenable for polymerization, due to their inert backbonesand/or lack of functional group compatibility with thedesired polymerization type. Based on a retro-biosyntheticanalysis of polyesters, a chemoenzymatic route from (@)-apinenetowards a verbanone-based lactone, which is furtherused in ring-opening polymerization, is presented. Generatedpinene-derived polyesters showed elevated degradation andglass transition temperatures, compared with poly(e-decalactone),which lacks a ring structure in its backbone. Semirationalenzyme engineering of the cyclohexanone monooxygenasefrom Acinetobacter calcoaceticus enabled the biosynthesis ofthe key lactone intermediate for the targeted polyester. As aproof of principle, one enzyme variant identified from screeningin a microtiter plate was used in biocatalytic upscaling,which afforded the bicyclic lactone in 39% conversion in shakeflask scale reactions.

National Category
Polymer Chemistry
Research subject
Biotechnology
Identifiers
urn:nbn:se:kth:diva-260797 (URN)10.1002/cbic.201900046 (DOI)000477916100008 ()30793830 (PubMedID)2-s2.0-85066903140 (Scopus ID)
Note

QC 20191008

Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2020-03-09Bibliographically approved
Olsen, P., Jawerth, M., Lawoko, M., Johansson, M. & Berglund, L. (2019). Transforming technical lignins to structurally defined star-copolymers under ambient conditions. Green Chemistry, 21(9), 2478-2486
Open this publication in new window or tab >>Transforming technical lignins to structurally defined star-copolymers under ambient conditions
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2019 (English)In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, Vol. 21, no 9, p. 2478-2486Article in journal (Refereed) Published
Abstract [en]

Transforming biomass derived components to materials with controlled and predictable properties is a major challenge. Current work describes the controlled synthesis of starcopolymers with functional and degradable arms from the Lignoboost (R) process. Macromolecular control is achieved by combining lignin fractionation and characterization with ring-opening copolymerization (ROCP). The cyclic monomers used are epsilon-caprolactone (epsilon CL) and a functional carbonate monomer, 2-allyloxymethyl-2-ethyltrimethylene carbonate (AOMEC). The synthesis is performed at ambient temperature, under bulk conditions, in an open flask, and the graft composition and allyl functionality distribution are controlled by the copolymerization kinetics. Emphasis is placed on understanding the initiation efficiency, structural changes to the lignin backbone and the final macromolecular architecture. The present approach provides a green, scalable and cost effective protocol to create well-defined functional macromolecules from technical lignins.

National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-252978 (URN)10.1039/c9gc00835g (DOI)000468627300033 ()2-s2.0-85065578205 (Scopus ID)
Note

QC 20190814

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-12-11Bibliographically approved
Yang, X., Reid, M. S., Olsén, P. & Berglund, L.Eco-Friendly Cellulose Nanofibrils Designed by Nature: Effects from Preserving Native State.
Open this publication in new window or tab >>Eco-Friendly Cellulose Nanofibrils Designed by Nature: Effects from Preserving Native State
(English)Manuscript (preprint) (Other academic)
National Category
Materials Engineering Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-262841 (URN)
Note

QC 20191023

Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-23Bibliographically approved
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