Arrhenius model for styrene monomer migration from single-use polystyrene cup

• Main Authors: Mat-Shayuti, M.S., Megat-Yusoff, P.S.M., Sharudin, R.W., Wan Bakar, W.Z., Jarni, H.H., Ahmad Fuad, F.I.
• Format: Conference or Workshop Item
• Published: Elsevier Ltd 2020
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85116432798&doi=10.1016%2fj.matpr.2021.03.530&partnerID=40&md5=5fb1bdd0b1e644f73611d076af63df24; http://eprints.utp.edu.my/29684/
• Institution: Universiti Teknologi Petronas

Harmful chemicals leaching into beverage contained in polystyrene (PS) cup is a concern for consumers, therefore this paper seeks to investigate the pattern of styrene monomers migration with respect to temperature. PS cups containing liquid stimulants (distilled water & cooking oil) were subjected to temperatures of 25-100 °C. Gas chromatography-mass spectrometry (GC-MS) showed no hint of styrene in distilled water but detected styrene traces in the cooking oil to be proportional with temperature. The migration rate jumped above 75 °C, suggesting a threshold point for enhanced styrene absorption. This could be attributed to the compromised structural integrity of the cup and greater styrene solubility in the cooking oil above 75 °C. The activation energy required for styrene migration from the PS cup computed through Arrhenius equation was 12.117 kJ/mol. Despite the finding, the highest recorded styrene content which was 1.1158 � 10-4wt at 100 °C still fell below the maximum allowable limit of 0.5 wt set by the U.S. Food and Drug Administration (FDA). © 2020 Elsevier Ltd. All rights reserved.