The data set is a study of photolysis and hydrolysis of poly(ethylene-terephthalate) films that contain an ultraviolet stabilizer additive. In this work, polymeric samples were exposed to UV light and moisture according to ASTM G-154 Cycle 4 standard accelerated weathering conditions. Resulting optical chemical changes were determined through optical and infrared (IR) spectroscopy. *Time* is the main exogenous variable and *YI* (yellowness index) is the endogenous variable (response). The other columns in the data set (*AbsEdge*, *UV.Stab.Bleaching*, *Crystallization*, and *ChainScission*) are values extracted from optical and IR absorbance spectra as single metrics and used as intermediate unit level endogenous (response) variables in the netSEM analysis.
A 37 by 6 data frame of continuous variables:
Yellowness index of PET film
Time exposed to ASTM G-154 Cycle 4 conditions
Fundamental Absorption Edge - Optical absorbance at 312 nm
Ultraviolet Stabilizer Bleaching - Optical absorbance at 340 nm
IR spectropscopy peak of relative crystallinity - IR absorbance at 975 wavenumber
IR carbonyl peak - IR absorbance at 1711 wavenumber
Devin A. Gordon, Wei-Heng Huang, Roger H. French, Laura S. Bruckman
Solar Durability and Lifetime Extension (SDLE) Research Center, Case Western Reserve University
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