Environmental Stress Cracking

Wypych, George

doi:10.1016/b978-1-895198-62-1.50021-4

Cited by 1 publication

(1 citation statement)

References 34 publications

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“…This kind of chemical attack is commonly confounded with Environmental Stress Cracking (ESC) because both cause cracking and brittleness of the material. However, in the ESC process, both chemical exposure and a tensile test (physical phenomenon) are included 1,2 .…”

Section: Introductionmentioning

confidence: 99%

Use of Infrared Spectroscopy and Near Infrared Hyperspectral Images to Evaluate Effects of Different Chemical Agents on PET Bottle Surface

et al. 2018

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PET-poly (ethylene terephthalate)-bottle surfaces were exposed to chemical agents and evaluated with middle infrared spectroscopy (MIR) and near infrared hyperspectral imaging (HSI-NIR). Images (928-2.524 nm) were acquired at different times from bottle surfaces exposed to alkaline, acidic and ethanolic media. Savitzky-Golay smoothing (2 nd order polynomial and 5-point window) combined with Standard Normal Variate (SNV) was used for pre-processing data. Scores from principal component analysis (PCA) on images showed discrimination of PET according to exposure time, particularly when employing NaOH. After the first two hours of chemical exposure, significant contribution of the (-CO + OH) combination band indicated formation of glycol ethylene on the PET surface, which was confirmed from PCA loading plots. MIR reflectance spectra ranged from 4.000 to 650 cm-1. Changes in spectral intensities could be associated with depolymerization of PET when exposed to NaOH. These were confirmed with PCA and attributed to the carboxylate group of terephthalate.

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Section: Introductionmentioning

confidence: 99%