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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 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∙10−4 K−1.

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Metadaten
Author:Christian DreyerORCiDGND, Dana Luca Motoc, Mathias Koehler, Leonid GoldenbergORCiD
URN:urn:nbn:de:kobv:526-opus4-19139
DOI (Version of Record):https://doi.org/10.3390/polym15142983
Parent Title (English):Polymers
Publisher:MDPI
Document Type:Article
Language:English
Year of Publication:2023
Publishing Institution:Technische Hochschule Wildau
Release Date:2024/04/18
Tag:UV LED curable coating; dielectric property; fluoroacrylate; optical loss; perfluoropolyether (PFPE); refractive index; thermo-optic coefficient; viscoelastic property
Volume:15
Issue:14
Article Number:2983
Page Number:1
Source:Dreyer, C.; Motoc, D.L.; Koehler, M.; Goldenberg, L. UV LED Curable Perfluoropolyether (PFPE)-Urethane Methacrylate Transparent Coatings for Photonic Applications: Synthesis and Characterization. Polymers 2023, 15, 2983. https://doi.org/10.3390/polym15142983
Faculties an central facilities:Fachbereich Ingenieur- und Naturwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik / 668 Technik anderer organischer Produkte
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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