Effect of substrate reflecting conditions on the curing of UV curable resin layers on aluminum and the formation of surface wavy structures

Zhao, Zhi‐Jun; Yang, Jeongho; Li, Xin; Park, Sang-Hu

doi:10.1016/j.matlet.2015.10.121

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…It should also be noted that aluminum panels used for coating applications may lead to more energy absorbed under UV-light irradiation, due to specular and partially scattered reflection. 31 Therefore, the final conversion calculated via CRM can vary based on the substrate employed. To avoid errors associated with variations in the substrate, all CRM conversion measurements here were made using an aluminum substrate.…”

Section: Methodsmentioning

confidence: 99%

“…For the 785 nm laser with a 0.75 aperture and 50× objective employed here, the theoretical spatial resolution is 1.2 μm. It should also be noted that aluminum panels used for coating applications may lead to more energy absorbed under UV-light irradiation, due to specular and partially scattered reflection . Therefore, the final conversion calculated via CRM can vary based on the substrate employed.…”

Section: Methodsmentioning

confidence: 99%

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Hybrid Free-Radical/Cationic Phase-Separated UV-Curable System: Impact of Photoinitiator Content and Monomer Fraction on Surface Morphologies and Gloss Appearance

2022

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Simultaneous photopolymerization of radical and cationic systems is one strategy to generate polymer network architectures named interpenetrating polymer networks (IPNs). In these hybrid systems, phase separation and final polymer morphology are ultimately governed by thermodynamic incompatibility and polymerization kinetics. This behavior is quite complex, as numerous factors can affect polymerization kinetics including monomer/oligomer viscosity and structure, light intensity, photoinitiator content and absorbance, cross-linking, vitrification, etc. In this work, the impact of photoinitiator concentration and monomer fraction on surface morphologies in a hybrid radical/cationic phase-separated system was examined. Wrinkles formed on the surface of photopolymerized films depend on the polymerization rate and acrylate/epoxy ratio. This phenomenon is partially explained by the rapid polymerization rate associated with the development of an epoxy matrix and a smaller acrylate domain. The size and shape of the wrinkles can be controlled by varying formulation parameters (mainly, composition) and photoinitiator content. It was possible to create surface roughness and consequently decrease the gloss by controlling the polymerization kinetics and phase-separated morphology. This study demonstrates that the morphology, polymerization kinetics, and film properties (e.g., gloss, transparency) can be manipulated with the ratio of the acrylate/epoxy mixture and the photoinitiator content.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%