Enhancing weathering durability of pre-protected and unprotected wood by using bark extracts as natural UV absorbers in waterborne acrylic coating

2021 ◽  
Author(s):  
Özlem Özgenç ◽  
Ebru Bilici ◽  
Sefa Durmaz ◽  
Cevdet Söğütlü ◽  
Serkan Emik
Keyword(s):  
Acrylic Coating ◽  
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

US 5,011,628 UV absorbers

1991 ◽  
Vol 1991 (8) ◽  
pp. 11
Keyword(s):  
Uv Absorbers

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.

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