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Functional Off-Stoichiometry Thiol-ene-epoxy Thermosets Featuring Temporally Controlled Curing Stages via an UV/UV Dual Cure Process
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0001-9651-4900
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0001-8248-6670
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2014 (English)In: Journal of Polymer Science Part A: Polymer Chemistry, ISSN 0887-624X, E-ISSN 1099-0518, Vol. 52, no 18, 2604-2615 p.Article in journal (Refereed) Published
Abstract [en]

We present a facile two-stage UV/UV activation method for the polymerization of off-stoichiometry thiol-ene-epoxy, OSTE+, networks. We show that the handling and processing of these epoxy-based resins is made easier by introducing a material with a controlled curing technique based on two steps, where the first step offers excellent processing capabilities, and the second step yields a polymer with suitable end-properties. We investigate the sequential thiol-ene and thiol-epoxy reactions during these steps by studying the mechanical properties, functional group conversion, water absorption, hydrolytic stability, and thermal stability in several different thiol-ene-epoxy formulations. Finally, we conclude that the curing stages can be separated for up to 24 h, which is promising for the usefulness of this technique in industrial applications.

Place, publisher, year, edition, pages
John Wiley & Sons, 2014. Vol. 52, no 18, 2604-2615 p.
Keyword [en]
coatings, curing of polymers, initiators, mechanical properties, thermosets, thiol-ene-epoxy photopolymerization
National Category
Polymer Technologies
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-145658DOI: 10.1002/pola.27276ISI: 000341189900006Scopus ID: 2-s2.0-84905741353OAI: oai:DiVA.org:kth-145658DiVA: diva2:719483
Projects
ROUTINEXMEMS
Funder
EU, FP7, Seventh Framework Programme, 304941EU, European Research Council, 267528
Note

Qc 20140911

Available from: 2014-05-26 Created: 2014-05-26 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Thiol-ene and Thiol-ene-epoxy Based Polymers for Biomedical Microdevices
Open this publication in new window or tab >>Thiol-ene and Thiol-ene-epoxy Based Polymers for Biomedical Microdevices
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Within healthcare there is a market pull for biomedical devices that can rapidly perform laboratory processes, such as diagnostic testing, in a hand-held format. For this reason, biomedical devices must become smaller, more sophisticated, and easier to use for a reasonable cost. However, despite the accelerating academic research on biomedical microdevices, and especially plastic-based microfluidic chips, there is still a gap between the inventions in academia and their benefit to society. To bridge this gap there is a need for new materials which both exhibit similar properties as industrial thermoplastics, and that enable rapid prototyping in academia.

In this thesis, thiol-ene and thiol-ene-epoxy thermosets are evaluated both in terms of their suitability for rapid prototyping of biomedical microdevices and their potential for industrial manufacturing of “lab-on-chips”.

The first part of the thesis focuses on material development of thiol-ene and thiol-ene-epoxy thermosets. Chemical and mechanical properties are studied, as well as in vitro biocompatibility with cells.

The second part of the thesis focuses on microfabrication methods for both thermosets. This includes reaction injection molding, photostructuring, and surface modification. It is demonstrated how thiol-ene and thiol-ene-epoxy both provide advantageous thermo-mechanical properties and versatile surface modifications via “thiol-click chemistry”.

In the end of the thesis, two applications for both polymer platforms are demonstrated. Firstly, thiol-ene is used for constructing nanoliter well arrays for liquid storage and on-demand electrochemical release. Secondly, thiol-ene-epoxy is used to enhance the biocompatibility of neural probes by tuning their flexibility.

It is concluded that both thiol-ene and thiol-ene-epoxy thermosets exhibit several properties that are highly suitable for rapid prototyping as well as for scalable manufacturing of biomedical microdevices.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 93 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2017:129
Keyword
biomedical microdevices, lab-on-a-chip, off-stoichiometry thiol-ene, OSTE, thiol-ene-epoxy, hybrid polymer networks, reaction injection molding, photostructuring, surface modification, bonding, liquid encapsulation, biocompatibility
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Medical Engineering Medical Biotechnology Materials Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-215110 (URN)978-91-7729-530-3 (ISBN)
Public defence
2017-11-13, F3, Lindstedtsvägen 26, Stockholm, 10:15 (English)
Opponent
Supervisors
Funder
EU, European Research CouncilEU, FP7, Seventh Framework Programme
Note

QC 20171003

Available from: 2017-10-03 Created: 2017-10-02 Last updated: 2017-10-03Bibliographically approved

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Vastesson, Alexandervan der Wijngaart, WouterJohansson, MatsHaraldsson, Tommy

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