| 1. |
- Carlborg, Carl Fredrik, et al.
(författare)
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Functional Off-Stoichiometry Thiol-ene-epoxy Thermosets Featuring Temporally Controlled Curing Stages via an UV/UV Dual Cure Process
- 2014
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Ingår i: Journal of Polymer Science Part A. - : John Wiley & Sons. - 0887-624X .- 1099-0518. ; 52:18, s. 2604-2615
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Hansson, Jonas, et al.
(författare)
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Low gas permeable and non-absorbent rubbery OSTE+ for pneumatic microvalves
- 2014
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Ingår i: Proceedings of the 27th IEEE International Conference on Micro Electro Mechanical Systems (MEMS 2014). - : IEEE conference proceedings. - 9781479935093 ; , s. 987-990
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Konferensbidrag (refereegranskat)abstract
- In this paper we introduce a new polymer for use in microfluidic applications, based on the off-stoichiometric thiol–ene-epoxy (OSTE+) polymer system, but with rubbery properties. We characterize and benchmark the new polymer against PDMS. We demonstrate that Rubbery OSTE+: has more than 90% lower permeability to gases compared to PDMS, has little to no absorption of dissolved molecules, can be layer bonded in room temperature without the need for adhesives or plasma treatment, can be structured by standard micro-molding manufacturing, and shows similar performance as PDMS for pneumatic microvalves, albeit allowing handling of larger pressure.
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| 3. |
- Haraldsson, Tommy, et al.
(författare)
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OSTE - a novel polymer system developed for Lab-on-Chip
- 2014
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Ingår i: Proceedings of SPIE Volume 8976. - : SPIE - International Society for Optical Engineering. - 9780819498892 ; , s. 897608-
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Konferensbidrag (refereegranskat)abstract
- OSTE polymer has the aim to address today's dissemination gap between successful lab-on-chip research and the healthcare setting. We have formulated and demonstrated a novel, superior, polymer system, OSTE, and its manufacturing platform, which is based on the mixture of three monomers: thiols, -enes and epoxies. The uniqueness of the OSTE approach stems from the curing in two distinct steps: after the first cure, an intermediate polymer is formed which is ideally suited for surface modifications and bonding; after the second cure we obtain an inert and robust polymer. Our vision is that OSTE has the potential to form a de-facto standard for research and development of high performance labs-on-chip in academia and industry.
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| 4. |
- Pardon, Gaspard, 1983-, et al.
(författare)
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Rapid mold-free manufacturing of microfluidic devices with robust and spatially directed surface modifications
- 2014
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Ingår i: Microfluidics and Nanofluidics. - : Springer Berlin/Heidelberg. - 1613-4982 .- 1613-4990. ; 17:4, s. 773-779
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Tidskriftsartikel (refereegranskat)abstract
- A new method that allows for mold-free, rapid and easy-to-use proto- typing of micro uidic devices comprising channels, access holes and surface modied patterns, is presented. The innovative method is based on direct photolithographic patterning of an o-stoichiometry thiol-ene (OSTE) polymer formulation, tailor-made for photolithography, which oers unprecedented spatial resolution and allow for ecient, robust and reliable, room temperature surface modication and glue-free, covalent room temperature bonding. This mold-free process does not require cleanroom equipment and therefore allows for rapid, i.e. less than one hour, design-fabricate-test cycles, using a material suited for larger scale production. The excellent photolithographic properties of this new OSTE formulation allow for high-resolution patterning in hundreds of micrometers thick layers, 200 m thick in this work. Moreover, we demonstrate robust (covalent) and spatially controlled modication of the microchannel surfaces with a contact angle of 76 degrees to hydrophobic/hydrophilic areas with contact angles of 102 and 43 degrees, respectively.
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| 5. |
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