title: HEA-PVA gel system for UVA radiation dose measurement.
abstract: Acrylic monomer is known to be sensitive to ultraviolet radiation (UVR) through photoinitiator. Upon irradiation, the acrylic monomers formed stable polymer through free radical polymerization, hence its appearance will change from colorless and transparent to colored and non-transparent. Furthermore, the degree of changes was based on the UVR dose, and those optical changes could be detected by UV-vis spectrophotometer at the fixed wavelength of 550nm. In this study, we used 2-hydroxyethyl acrylate (HEA) as acrylic monomer, which mixed with polyvinyl alcohol (PVA), and finally obtained a three-dimensional hydrogel material through cross-linking by glutaraldehyde (GA). After doping with photoinitiator-Bis(2,6-difluoro-3-(1-hydropyrro-1-yl)-phenyl) titanocene (784), the gel material was sensitive to UV-A radiation (400-315nm), which forms an important part (~97%) of the natural solar UV radiation reaching the earth surface. The behavior of different formulations' dose response sensitivity, detector linearity, diffusion, stability after UVA radiation were investigated. The results showed that when the dosage range of UVA radiation was 0-560J/cm(2), the gel had a great sensitivity and the linearity was found to be closed to 1. After UVA radiation, the gel also had a very good optical stability. In addition to this, when irradiated with high dose UVA, the gel could maintain a low diffusion.
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Liming
authors.initials: L
authors.lastname: Yang
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.
authors.forename: Sijia
authors.initials: S
authors.lastname: Fang
authors.affiliation: School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China. Electronic address: jchen@shu.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D004058:Diffusion; D005782:Gels; D005976:Glutaral / Q000737:chemistry; D016014:Linear Models; D011142:Polyvinyl Alcohol / Q000737:chemistry*; D011874:Radiometry / Q000379:methods*; D014466:Ultraviolet Rays
chemical_list: D000179:Acrylates; D005782:Gels; C035957:2-hydroxyethyl acrylate; D011142:Polyvinyl Alcohol; D005976:Glutaral
keywords: 2-Hydroxyethyl acrylate; Optical absorbance; UVA dosimeter; Ultraviolet radiation