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Biobased UV-curable coatings based on itaconic acid
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
2017 (English)In: Journal of Coatings Technology Research, ISSN 1945-9645, Vol. 14, no 4, p. 851-861Article in journal (Refereed) Published
Abstract [en]

A series of renewable unsaturated polyesters were synthesized from itaconic acid (IA), succinic acid, and 1,4-butanediol by solvent-free polycondensation. Previous studies utilizing IA to make polyesters for coating applications have shown great potential; however, the curing and material properties have not been investigated in detail. The aim of this study was to investigate how the curing is affected by the amount of unsaturations and how well itaconate-based polyesters crosslink without the addition of any other unsaturated monomers or reactive diluents. The chemical structures of the polyesters were confirmed with FTIR, 1 HNMR, and THF-SEC. The degree of curing was studied with FTIR, and the mechanical properties of the crosslinked polyesters were evaluated with DMA, pendulum hardness, and microindentation. The degree of curing was found to be up to 75%, and furthermore, it was found that the final mechanical properties of the crosslinked coatings could be tuned by modifying the IA content in the monomer composition. The results from DMA showed that there is a clear trend between mechanical properties and crosslinking density.

Place, publisher, year, edition, pages
Springer-Verlag New York, 2017. Vol. 14, no 4, p. 851-861
Keywords [en]
Biobased, Itaconic acid, UV, Polyester, Coatings
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-212950DOI: 10.1007/s11998-017-9949-yISI: 000406744400011Scopus ID: 2-s2.0-85020271318OAI: oai:DiVA.org:kth-212950DiVA, id: diva2:1136021
Conference
11th Coatings Science International Conference (COSI), June 22-26, 2015, Noordwijk, Netherlands
Note

QC 20170825

Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2019-04-25Bibliographically approved
In thesis
1. Exploring bio-based monomers for UV-curable polymer networks
Open this publication in new window or tab >>Exploring bio-based monomers for UV-curable polymer networks
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increased environmental awareness and concern has led to a high demand for sustainable, bio-based materials. Consequently, there is a need for research and development of new bio-based polymeric materials that can be synthesized via routes eliminating excessively toxic reactants and by-products. The work presented in this thesis has focused on the utilization of catalysis, mainly enzymatic, and photopolymerization in order to create efficient synthesis of polymeric networks from bio-based monomers.Polyesters from bio-based monomers have been polymerized in bulk and thereafter crosslinked by UV initiation to yield polymer networks with tunable properties. The synthesis was also studied more in detail by varying the different types of catalysts and comparing their effect on the polymer products. Polyesters are a promising class of polymers that can be made from bio-based resources due to the wide range of available bio-based carboxylic acids and alcohols that can be combined to yield many polymers with different properties. However, the synthesis of polyesters is rather time-consuming in order to reach high conversions.As a more efficient alternative, short chain esters monomers and oligomers that have vinyl ether (VE) functionalities were developed. These VE-esters can be synthesized partly from bio-based resources, such as acids, fatty acids and diols, and their synthesis is efficient with enzymatic catalysis. The VE functionality provides a reactive group which can be polymerized rapidly with cationic polymerization. In general, the vinyl ether-esters can be synthesized in less than one hour and crosslinked within a few minutes, which is significantly faster than traditional polyester-synthesis and crosslinking. The enzymatic synthesis of vinyl ether esters also provided a method for developing monomers with orthogonal functionality which was explored by developing functionalizable materials with a variety of macromolecular architectures.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 56
Series
TRITA-CBH-FOU ; 2019:30
Keywords
Bio-based, polymers, vinyl ether, polyester, photopolymerization, lipase
National Category
Polymer Chemistry
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-249950 (URN)978-91-7873-195-4 (ISBN)
Public defence
2019-05-24, Kollegiesalen, Brinellvägen 8, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2019-04-25 Created: 2019-04-25 Last updated: 2019-04-26Bibliographically approved

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