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Publications (6 of 6) Show all publications
Jawerth, M., Johansson, M. & Lawoko, M. (2019). Renewable thermosetting resins based on refined technical lignin: fractionation, modification and valorization. Paper presented at National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL. Abstracts of Papers of the American Chemical Society, 257
Open this publication in new window or tab >>Renewable thermosetting resins based on refined technical lignin: fractionation, modification and valorization
2019 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 257Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2019
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-257603 (URN)000478860503063 ()
Conference
National Meeting of the American-Chemical-Society (ACS), MAR 31-APR 04, 2019, Orlando, FL
Note

QC 20190919

Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically 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: 2019-08-14Bibliographically approved
Jawerth, M., Johansson, M., Lundmark, S., Gioia, C. & Lawoko, M. (2018). A retrosynthesis perspective on new thermoset resin applications based on industrial Kraft lignin. Paper presented at 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA. Abstract of Papers of the American Chemical Society, 255
Open this publication in new window or tab >>A retrosynthesis perspective on new thermoset resin applications based on industrial Kraft lignin
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2018 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 255Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-240159 (URN)000435537703036 ()
Conference
255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, MAR 18-22, 2018, New Orleans, LA
Note

QC 20190111

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-01-11Bibliographically approved
Vilela, C., Engström, J., Valente, B. F. A., Jawerth, M., Carlmark, A. & Freire, C. S. R. (2018). Exploiting poly(ɛ-caprolactone) and cellulose nanofibrils modified with latex nanoparticles for the development of biodegradable nanocomposites. Polymer Composites
Open this publication in new window or tab >>Exploiting poly(ɛ-caprolactone) and cellulose nanofibrils modified with latex nanoparticles for the development of biodegradable nanocomposites
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2018 (English)In: Polymer Composites, ISSN 0272-8397, E-ISSN 1548-0569Article in journal (Refereed) Published
Abstract [en]

This study reports the development of nanocomposites based on poly(?-caprolactone) (PCL) and cellulose nanofibrils (CNF) modified with cationic latex nanoparticles. The physical adsorption of these water-based latexes on the surface of CNF was studied as an environment-friendly strategy to enhance the compatibility of CNF with a hydrophobic polymeric matrix. The latexes are composed of amphiphilic block copolymers based on cationic poly(N,N-dimethylaminoethyl methacrylate-co-methacrylic acid) as the hydrophilic block, and either poly(methyl methacrylate) or poly(n-butyl methacrylate) as the hydrophobic block. The simple and practical melt-mixing of PCL- and latex-modified CNF yielded white homogeneous nanocomposites with complete embedment of the nanofibrils in the thermoplastic matrix. All nanocomposites are semicrystalline materials with good mechanical properties (Young's modulus?=?43.6?52.3 MPa) and thermal stability up to 335?340°C. Degradation tests clearly showed that the nanocomposites slowly degrade in the presence of lipase-type enzyme. These PCL/CNF-latex nanocomposite materials show great promise as future environmentally friendly packaging materials. POLYM. COMPOS., 2018. ? 2018 Society of Plastics Engineers

Place, publisher, year, edition, pages
John Wiley & Sons, Ltd, 2018
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-241451 (URN)10.1002/pc.24865 (DOI)000463102200009 ()2-s2.0-85045412566 (Scopus ID)
Note

QC 20190123

Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2019-04-29Bibliographically approved
Jawerth, M., Lawoko, M., Lundmark, S., Pérez-Berumen, C. M. & Johansson, M. K. (2016). Allylation of a lignin model phenol: a highly selective reaction under benign conditions towards a new thermoset resin platform. RSC Advances, 6(98), 96281-96288
Open this publication in new window or tab >>Allylation of a lignin model phenol: a highly selective reaction under benign conditions towards a new thermoset resin platform
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, no 98, p. 96281-96288Article in journal (Refereed) Published
Abstract [en]

The lack of aromatic material constituents derived from renewable resources poses a problem to meet the future demands of a more sustainable society. Lignin is the most abundant source of aromatic structures found in nature and is a highly interesting source for material applications. Development of controlled chemical modification routes of lignin structures are crucial in order to further develop this area. In this study allyl chloride is used to selectively modify a lignin phenol in the presence of other lignin functionalities, i.e. aliphatic hydroxyls and conjugated alkenes, under mild reaction conditions in quantitative yields. For this, coniferyl alcohol was used as a model compound in the present study. The modification was carried out in ethanol as the synthesis media. Studies on the effect of reaction time and temperature revealed optimum conditions allowing for a quantitative yield without any detectable levels of byproducts as studied with NMR, FT-IR and FT-Raman. The thermal stability of the formed product was determined to be up to at least 160 degrees C through DSC measurements. In addition, as a proof of concept, the use of the allylated monomer to form crosslinked films using free radical thiol-ene polymerization was demonstrated.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-199018 (URN)10.1039/c6ra21447a (DOI)000385633100109 ()2-s2.0-84991578448 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20170119

Available from: 2017-01-19 Created: 2016-12-22 Last updated: 2017-11-29Bibliographically approved
Jawerth, M., Lawoko, M., Lundmark, S., Berumen, C. P. & Johansson, M. (2016). Modification of low molecular weight lignin model compounds for thermoset resin applications. Abstract of Papers of the American Chemical Society, 251
Open this publication in new window or tab >>Modification of low molecular weight lignin model compounds for thermoset resin applications
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2016 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 251Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2016
National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-242687 (URN)000431903802448 ()
Note

QC 20190221

Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-21Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4226-8593

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