Effect of Calcium Oxide on Stress Crack Resistance and Light Transmittance in PET Containers for Packaging Carbonated Beverages

Gökçen Yuvalı; Esen Dagasan Bulucu; Bilal Demirel; Ali Yaraş; Fatih Akkurt; Sedat Sürdem; Burçak Demirel

doi:10.1021/acsomega.3c07193

Effect of Calcium Oxide on Stress Crack Resistance and Light Transmittance in PET Containers for Packaging Carbonated Beverages

ACS Omega. 2024 Jan 8;9(3):3491-3498. doi: 10.1021/acsomega.3c07193. eCollection 2024 Jan 23.

Authors

Gökçen Yuvalı¹, Esen Dagasan Bulucu², Bilal Demirel², Ali Yaraş³, Fatih Akkurt⁴, Sedat Sürdem⁵, Burçak Demirel⁶

Affiliations

¹ Department of Pharmaceutical Biotechnology, Erciyes University, Kayseri 38280, Turkey.
² Department of Material Science and Engineering, Erciyes University, Kayseri 38030, Turkey.
³ Department of Metallurgy and Materials Engineering, Bartin University, Bartin 74110, Turkey.
⁴ Department of Chemical Engineering, Gazi University, Ankara 06560, Turkey.
⁵ Graduate School of Natural and Applied Sciences, Gazi University, Ankara 06500, Turkey.
⁶ Department of Electrical-Electronics Engineering, Abdullah Gul University, 38080 Kayseri, Turkey.

Abstract

For polyethylene terephthalate (PET) bottles, a material used for food packaging, light transmission and mechanical performance, particularly environmental stress cracking (ESC), are essential characteristics. For this purpose, following extrusion of PET/CaO granules, preforms were manufactured using the injection technique, and bottles were produced by a stretch-blow-molding process. With incorporation of calcium oxide (CaO), light transmittance increased by around 25%, and ESC went from 0.3 to 11 min. In addition, whereas acetaldehyde (AA) and carboxylic acid (COOH) decomposition values rose with increasing CaO content, diethylene glycol and isophthalic acid values did not significantly change. Moreover, the maximum crystallization temperature and crystallinity both exhibited an upward trend with the CaO content.