UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization
The contribution aims to bring forth a novel synthesis route in developing transparent UV LED-curable coatings accounting for various exposure options. A selection of perfluoropolyether (PFPE)-urethane methacrylate and acrylate resins, free-radical photo-initiator Omnirad 2100, and two distinct sila...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/15/14/2983 |
| _version_ | 1797587731410321408 |
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| author | Christian Dreyer Dana Luca Motoc Mathias Koehler Leonid Goldenberg |
| author_facet | Christian Dreyer Dana Luca Motoc Mathias Koehler Leonid Goldenberg |
| author_sort | Christian Dreyer |
| collection | DOAJ |
| description | The contribution aims to bring forth a novel synthesis route in developing transparent UV LED-curable coatings accounting for various exposure options. A selection of perfluoropolyether (PFPE)-urethane methacrylate and acrylate resins, free-radical photo-initiator Omnirad 2100, and two distinct silane-based crosslinking agents were blended under a weight ratio of 75:20:5 (without crosslinker) and 70:15:5:10, respectively. The coatings were cured under a UV LED 4 × 3 matrix light emitting source, in a chamber under a controlled atmosphere, by means of an in-house developed conveyor belt type platform, at different conveyor belt speeds (5, 50, 150, 250, and 500 mm/s). The morphologies of fabricated coatings were characterized by FTIR revealing high conversion rates (e.g., from 98 to 100%) for increased exposure time as a result of the 5 or 50 mm/s values, on all combinations. Dynamic–mechanical and optical properties of UV LED-cured transparent coatings were also investigated. A negative shift of the glass transition temperature values with a decrease in exposure time, in all combinations, from about 60 °C to 30 °C, along with storage moduli lowering in the glassy plateau further favors higher exposure times for curing. The refractive indices of poly-mers were from 1.38 to 1.40, whereas the thermo-optic coefficients are showing minor changes around the value of 2.55∙10<sup>−4</sup> K<sup>−1</sup>. |
| first_indexed | 2024-03-11T00:43:04Z |
| format | Article |
| id | doaj.art-7f553a6fc3c54148832074ccb261f7c1 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-11T00:43:04Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-7f553a6fc3c54148832074ccb261f7c12023-11-18T21:01:40ZengMDPI AGPolymers2073-43602023-07-011514298310.3390/polym15142983UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and CharacterizationChristian Dreyer0Dana Luca Motoc1Mathias Koehler2Leonid Goldenberg3Department Fiber Composite Material Technologies, Faculty Engineering and Natural Sciences, Technical University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, GermanyDepartment of Automotive and Transport Engineering, Faculty of Mechanical Engineering, Transilvania University of Brașov, 29 Eroilor Av., 500036 Brașov, RomaniaResearch Division Polymeric Materials and Composites PYCO, Fraunhofer Institute for Applied Polymer Research IAP, Schmiedestr. 5, 15745 Wildau, GermanyDepartment Fiber Composite Material Technologies, Faculty Engineering and Natural Sciences, Technical University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, GermanyThe contribution aims to bring forth a novel synthesis route in developing transparent UV LED-curable coatings accounting for various exposure options. A selection of perfluoropolyether (PFPE)-urethane methacrylate and acrylate resins, free-radical photo-initiator Omnirad 2100, and two distinct silane-based crosslinking agents were blended under a weight ratio of 75:20:5 (without crosslinker) and 70:15:5:10, respectively. The coatings were cured under a UV LED 4 × 3 matrix light emitting source, in a chamber under a controlled atmosphere, by means of an in-house developed conveyor belt type platform, at different conveyor belt speeds (5, 50, 150, 250, and 500 mm/s). The morphologies of fabricated coatings were characterized by FTIR revealing high conversion rates (e.g., from 98 to 100%) for increased exposure time as a result of the 5 or 50 mm/s values, on all combinations. Dynamic–mechanical and optical properties of UV LED-cured transparent coatings were also investigated. A negative shift of the glass transition temperature values with a decrease in exposure time, in all combinations, from about 60 °C to 30 °C, along with storage moduli lowering in the glassy plateau further favors higher exposure times for curing. The refractive indices of poly-mers were from 1.38 to 1.40, whereas the thermo-optic coefficients are showing minor changes around the value of 2.55∙10<sup>−4</sup> K<sup>−1</sup>.https://www.mdpi.com/2073-4360/15/14/2983perfluoropolyether (PFPE)fluoroacrylatesUV LED curable coatingviscoelastic propertiesrefractive indexthermo-optic coefficient |
| spellingShingle | Christian Dreyer Dana Luca Motoc Mathias Koehler Leonid Goldenberg UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization Polymers perfluoropolyether (PFPE) fluoroacrylates UV LED curable coating viscoelastic properties refractive index thermo-optic coefficient |
| title | UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization |
| title_full | UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization |
| title_fullStr | UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization |
| title_full_unstemmed | UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization |
| title_short | UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization |
| title_sort | uv led curable perfluoropolyether pfpe urethane methacrylate transparent coatings for photonic applications synthesis and characterization |
| topic | perfluoropolyether (PFPE) fluoroacrylates UV LED curable coating viscoelastic properties refractive index thermo-optic coefficient |
| url | https://www.mdpi.com/2073-4360/15/14/2983 |
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