Investigation of vacuum deposited hybrid coatings of protic organic UV absorbers embedded in a silica matrix used for the UV protection of Polycarbonate glazing

Abstract

A study of vacuum-deposited organic-inorganic hybrid coatings for UV protection of polycarbonate is presented. UV-absorbing compounds, which are commonly used for polycarbonate, were embedded in a silica matrix by thermal co-evaporation under high vacuum. In addition to the optical properties of the coatings, the influence of the silica network on the organic UV absorber and the stability of the intramolecular hydrogen bond (IMHB) are discussed. A model is presented to show the interaction between the organic compound and the silica matrix. It could be shown with UV irradiation experiments that the hydroxyphenyltriazine compound exhibits higher UV stability in the hybrid coating than the hydroxybenzotriazoles

Combinations of photoinitiator and UV absorber for cell-based digital light processing (DLP) bioprinting

“…UA competitively absorbs UV radiation and transfers to an excited electronic state, where the absorbed energy is dissipated through the surrounding molecules as heat energy [20]. Due to this aspect, UAs have been widely used in sunscreen formulation [21] and light stabilizers in the plastic manufacturing industries such as poly(vinyl chloride) [22] and polycarbonate [23]. UA can prevent the over-curing of layers beyond the focal plane impeding the undesirable crosslinking of a hydrogel and the scattering of light to increase the XY resolution of the 3D printed structure; however, the excessive amount of UA can also be cytotoxic to the cells.…”

Realisation of polyester fabrics with low transmission for ultraviolet light

“…Additionally, it is often demanded that the optical properties in the visible range of light (400-750 nm) are not changed. 50,66,67 As a first reference measurement, the transmission spectra of the untreated polyester fabrics were recorded (Figure 4). These spectra of the untreated polyester fabrics can be roughly divided into two different areas.…”

“…For perfect UV protection, the transmission of UV light in the spectral range of below 400 nm should be as low as possible. Additionally, it is often demanded that the optical properties in the visible range of light (400‐750 nm) are not changed 50,66,67 . As a first reference measurement, the transmission spectra of the untreated polyester fabrics were recorded (Figure 4).…”

TiO2 Coatings Via Atmospheric-Pressure Plasma-Enhanced Chemical Vapor Deposition for Enhancing the UV-Resistant Properties of Transparent Plastics

“…Weber et al fabricated vacuum-deposited organic–inorganic hybrid coatings embedded with hydroxyphenyltriazine and hydroxybenzotriazoles for UV protection of PC. The fabricated hybrid coatings exhibited high stability during UV irradiation experiments …”

“…The fabricated hybrid coatings exhibited high stability during UV irradiation experiments. 4 Currently, there are several UV absorbers available for UV protection, including titanium dioxide (TiO 2 ), 5 cerium oxide, 6 zinc oxide, 7 2,2-dihydroxy-4-methoxy-benzophenone, 8 MIL-125(Ti)-NH 2 , and MIL-68(In)-NH 2 . 9 TiO 2 is one of the most widely used UV absorbers because it exhibits nontoxicity, good physical and chemical stabilities, cost effectiveness, good visible light transparency, and outstanding UV-blocking properties.…”