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Oxetane-Terminated Telechelic Epoxy-Functional Polyesters as Cationically Polymerizable Thermoset Resins: Tuning the Reactivity with Structural Design
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.ORCID iD: 0000-0003-3201-5138
2015 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 53, no 19, 2258-2266 p.Article in journal (Refereed) Published
Abstract [en]

A series of epoxy-functional telechelic oligomers containing oxetane end groups have been synthesized. The precursor monomer, extracted from outer Birch bark, was first polymerized through enzyme-catalyzed esterification to form oligomers having epoxy and/or oxetane groups in the structures. The oligoesters were subsequently crosslinked through cationic polymerization either by epoxy or oxetane homopolymerization or copolymerization when both functionalities were present. A study of the polymerizations of the resins was performed "in situ" using real-time Fourier transform infrared spectroscopy revealing a preferred copolymerization when compared with the homopolymerization. By tailoring the different structures, it was possible to control the final mechanical properties of the networks.

Place, publisher, year, edition, pages
[Torron, Susana; Johansson, Mats] KTH Royal Inst Technol, Div Coating Technol, Sch Chem Sci & Engn, Dept Fibre & Polymer Technol, SE-10044 Stockholm, Sweden., 2015. Vol. 53, no 19, 2258-2266 p.
Keyword [en]
biobased monomer, cationic polymerization, enzymatic catalysis, enzymes, epoxide, oxetane, telechelic polymers
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-174215DOI: 10.1002/pola.27673ISI: 000360729600008Scopus ID: 2-s2.0-84942295531OAI: oai:DiVA.org:kth-174215DiVA: diva2:861442
Note

QC 20151016

Available from: 2015-10-16 Created: 2015-10-02 Last updated: 2017-12-01Bibliographically approved
In thesis
1. Sustainable synthetic pathways towards the formation of bio-based polymeric materials
Open this publication in new window or tab >>Sustainable synthetic pathways towards the formation of bio-based polymeric materials
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Increasing environmental and social awareness arising from the use of oil as main source of raw materials, has awaken the interest of many scientists to explore new synthetic pathways for polymer production. These new approaches embrace the use of alternative feedstock and sustainable synthetic routes aiming for enhancing biodegradability and recyclability. This shift towards more benign strategies is considered positive from different perspectives. Through the exploitation of bio-based feedstock it is possible to minimize the carbon foot print at the same time as new tools for material formation are provided. The use of selective catalysts reduces the formation of side-products, minimizes or avoids the use of solvents and diminish energy consumption. At the same time, new polymeric structures can be formed in terms of functionality and architectures.  

The work herein presented have focused on the development of sustainable synthetic routes for the formation of bio-based polymeric materials with targeted properties. In order to afford this, two bio-sources have been explored for the retrieval of different epoxy-fatty acids, i.e. outer birch bark and vegetable oils. In order to be able to tailor the final material properties and thus be able to target specific applications, we have relied on the selectivity of lipases to preserve the epoxy-functionalities during synthesis. Through the design of specific polymer architectures, e.g. telechelic oligomers, and branched or linear macromers, different degrees of functionality could be prepared. By covalently reacting the epoxy groups through different polymerization techniques, polymer networks were achieved. The proposed synthetic approach resulted in polymeric materials with wide variety of properties ranging from functional networks, to high Tg materials and adhesives, prepared all from renewable sources. This also proved the benefits of the use of lipases in synthesis of polymers for material applications.  

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 61 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:38
Keyword
bio-based, polymers, materials
National Category
Polymer Technologies
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-195079 (URN)978-91-7729-173-2 (ISBN)
Public defence
2016-12-02, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20161101

Available from: 2016-11-01 Created: 2016-11-01 Last updated: 2016-11-11Bibliographically approved

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