Permanence of UV Absorbers in Plastics and Coatings

2001 ◽  
pp. 250-265 ◽  
Author(s):  
James E. Pickett
Keyword(s):  
Uv Absorbers

Simple Modification Measurement of Photodegradability of Polymers by using Photo-induced Chemiluminescence Technique

2013 ◽  
Vol 10 (2) ◽  
pp. 51
Author(s):  
Siti Farhana Zakaria ◽  
Keith R Millington
Keyword(s):  
Free Radicals ◽  
Organic Materials ◽  
Oxidative Degradation ◽  
Working Life ◽  
Bimolecular Reaction ◽  
Synthetic Polymers ◽  
Accelerated Weathering ◽  
Simple Modification ◽  
Uv Absorbers ◽  
Irradiation Period

Polymers and organic materials that are exposed to sunlight undergo photooxidation, which leads to deterioration of their physical properties. To allow adequate performance under outdoor conditions, synthetic polymers require additives such as antioxidants and UV absorbers. A major problem with optimising polymer formulations to maximise their working life span is that accelerated weathering tests are empirical. The conditions differ significantly from real weathering situations, and samples require lengthy irradiation period. Degradation may not be apparent in the early stages of exposure, although this is when products such as hydroperoxides are formed which later cause acceleration of oxidation. A simple way of quantifying the number of free radicals presents in organic materials following exposure to light or heat is by measuring chemiluminescence (CL) emission. Most polymers emit CL when they undergo oxidative degradation, and it originates from the bimolecular reaction of macroperoxy radicals which creates an excited carbonyl.

Safer Sunscreens: Investigation of Naturally Derived UV Absorbers for Potential Use in Consumer Products

2021 ◽  
Author(s):  
Aubri J. Thompson ◽  
William M. Hart-Cooper ◽  
Julia Cunniffe ◽  
Kaj Johnson ◽  
William J. Orts
Keyword(s):  
Consumer Products ◽  
Uv Absorbers ◽  
Potential Use

Novel UV absorbers prepared from 2,4-dihydroxybenzophenone and hexachlorocyclotriphosphazene

1993 ◽  
Vol 50 (11) ◽  
pp. 1857-1862 ◽  
Author(s):  
Kenzo Inoue ◽  
Hiroaki Takahata ◽  
Teiichi Tanigaki
Keyword(s):  
Uv Absorbers

scholarly journals Vapour pressures of hydroxybenzophenone UV absorbers

1999 ◽  
Vol 329 (1) ◽  
pp. 73-76 ◽  
Author(s):  
Duncan M Price ◽  
Michael Hawkins
Keyword(s):  
Uv Absorbers

Facile fabrication of polyvinyl alcohol-based hydrophobic, fluorescent film via Hantzsch reaction for broadband UV protection

2021 ◽  
Author(s):  
Hongchen Liu ◽  
Hongying Yang ◽  
Kunkun Zhu ◽  
Fang Peng ◽  
Lei Guo ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Chemical Modification ◽  
Human Health ◽  
Uv Light ◽  
Uv Protection ◽  
Hantzsch Reaction ◽  
Uv Absorbers ◽  
Traditional Preparation ◽  
Facile Fabrication

Excessive exposure to ultraviolet (UV) light is harmful to human health. However, the traditional preparation of anti-UV films through doping UV absorbers is unstable. Chemical modification of polyvinyl alcohol (PVA)...

Optical properties of silicene-dielectric interfaces from IR to far UV

2021 ◽  
pp. 2150235
Author(s):  
Yujun Hou ◽  
Chun Jiang
Keyword(s):  
Optical Properties ◽  
Single Layer ◽  
Normal Incidence ◽  
Complex Surface ◽  
Optical Characterization ◽  
Potential Candidate ◽  
Dielectric Interfaces ◽  
Uv Absorbers ◽  
Uv Range

Since the growth of single layer of Si has emerged, silicene became a potential candidate material to make up the disadvantage of graphene. In this paper, the complex surface conductivity is applied to characterize the properties of silicene and we investigate the optical characterization of silicene-dielectric interfaces from IR to far UV range. The silicene-Si and silicene-Ge interfaces along both parallel and perpendicular polarization directions of electromagnetic field with normal incidence are considered in this work. The optical properties of the silicene-dielectric systems proposed in this paper lay a foundation for the performance of complex silicene-based optoelectronic devices such as sensors, detectors, filters, UV absorbers and so on.

scholarly journals Study on Migration of Two Triazine Type Ultraviolet Absorbents from Polypropylene Packaging Materials to Food Simulant

2020 ◽  
Vol 145 ◽  
pp. 01024
Author(s):  
Yue Qiu ◽  
Yan Ruan ◽  
Genrong Li
Keyword(s):  
Rapid Detection ◽  
Extraction Method ◽  
Detection Method ◽  
Migration Behavior ◽  
Contact Materials ◽  
Food Contact Materials ◽  
Food Contact ◽  
Food Simulant ◽  
Uv Absorbers ◽  
Time Required

The migration rules of two triazine type of UV absorbents (UV-1577 and UV-1579) from polypropylene (PP) food contact materials to food simulant were investigated. A rapid detection method of UV-1577 and UV-1579 in PP food contact materials was established by ultra-performance convergence chromatography (UPC2). The optimal extraction method of the initial solution was determined, and the pretreatment methods of two UV absorbents in the liquid simulants were optimized. Experiment results showed that the interaction effects between the two UV absorbers and the liquid simulants were weak, and the migration behavior was the most obvious in the fatty simulant of isooctane. At the same temperature, the migration amount of both UV-1577 and UV-1579 increased with the extension of time, and UV-1577 was more prone to migration than UV-1579. Within a certain range, the migration amount of the two UV absorbents increased significantly with the increase of the migration temperature. The higher the temperature was, the shorter the time required to reach the equilibrium.

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