| pet {netSEM} | R Documentation |
A data frame of an degradation experiment of poly(ethylene-terephthalate) films
Description
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.
Usage
data(pet)
Format
A 37 by 6 data frame of continuous variables:
- YI
Yellowness index of PET film
- Time
Time exposed to ASTM G-154 Cycle 4 conditions
- AbsEdge
Fundamental Absorption Edge - Optical absorbance at 312 nm
- UVStabBleaching
Ultraviolet Stabilizer Bleaching - Optical absorbance at 340 nm
- Crystallization
IR spectropscopy peak of relative crystallinity - IR absorbance at 975 wavenumber
- ChainScission
IR carbonyl peak - IR absorbance at 1711 wavenumber
Author(s)
Devin A. Gordon, Wei-Heng Huang, Roger H. French, Laura S. Bruckman
Source
Solar Durability and Lifetime Extension (SDLE) Research Center, Case Western Reserve University