Interaction of ultraviolet absorbers

Photostabilisation of Polymer Materials

“…Such a synergism was observed between hydrogen transfer-type UVAs and charge separation-type UVAs [123]. However, it was observed that photo-oxidation can occur by the fluorescence, which is emitted by a photoexcited UV-B absorber.…”

Dependence of ultraviolet absorbers' performance on ultraviolet wavelength

“…2-Hydroxy-4-methoxybenzophenone, 2-hydroxybenzophenone, 2-hydroxy-5-methylbenzophenone, 2 0 -hydroxy-5 0 -methoxyacetophenone, phenyl salicylate, 4-tert-butylphenyl salicylate, 4-nitrophenyl salicylate, benzyl salicylate, and n-propyl salicylate were purchased from Tokyo Kasei Kogyo Ltd. The other benzophenone-type UVA and homologs were synthesized by procedures reported in a paper [10,11]. The other salicylate-type UVA were synthesized by the following general procedures.…”

“…Shown in Tables 1e3 are photochemical natures, intramolecular hydrogen bonds, and photo-antioxidant abilities of UVA used in this study [10,11]. Almost all currently used UVA have six-membered quasi-rings formed by an intramolecular hydrogen bond, which have been studied vigorously due to the photochemical interest [14e16].…”

“…Supposing that the essence of UVA performance is to inhibit the photo-oxidation of polymeric materials, we tried to connect the 3 with photo-antioxidant ability of UVA, but our effort ended in failure [10,11]. Instead, we have just found the fairly good correlation between photo-antioxidant ability and maximum absorption wavelength (l max ) of UVA.…”

Synthesis, characterization, and crystal structure of modified benzophenone UV-absorber containing reactive group

“…It can transform absorbed radiation energy into less harmful thermal energy via a photophysical process involving ground-state and excited-state molecules [4,5], and has been used as compounding agents for sun-screening cosmetics and medicals or as additives in various plastics, resins, anti-UV coatings, functional textile finishing, and many other fields to prevent the undesirable photooxidation and photodegradation from sunlight [6][7][8]. However, the UV absorber has no reactive group, and lacks affinity for cellulose fibers as ramie and cotton and thus cannot easily fix with fibers but can easily diffuse, and has poor wash fastness when applied to textiles [1,9,10].…”