标题：Effect of thermal aging on migration characteristics of heavy metal in PET
作者：Song, Xiaoyun ;Sun, Zhuojun ;Li, Chunping ;Gao, Jian ;Ma, Jinglong ;Guo, Bing ;Zhao, Fuwen ;Yu, Hongguan ;Gao, Jianguo
作者机构：[Song, Xiaoyun ;Yu, Hongguan ] College of Chemistry and Chemical Engineering, Shandong University of Science and Techonlogy, Qingdao; 266590, China;[L 更多
会议名称：Chinese Materials Congress on Methods of Design and Characterization of Materials, Research and Development of Technological Processes, 2015
会议日期：10 July 2015 through 14 July 2015
来源：Materials Science Forum
关键词：Crystallinity; Different scanning calorimeter; Heavy metal migration quantity; Inductively Coupled Plasma Mass Spectrometry; Polyethylene terephthalate
摘要：Polyethylene terephthalate (PET) is usually used as food packaging materials. And the heavy metal introduced during the process of manufacture usually exists in the spaces between macromolecules as monomer form. When PET contacts with real food, some heavy metals will migrate into the food since the motion of these molecules overcomes the binding power. As a result, it does great harm to our health. In this article PET was disposed in different thermal ageing conditions in order to accelerate its aging process. Then the original and aged PET samples were tested by Different Scanning Calorimeter (DSC) to characterize its crystallinity. And migration experiments was conducted on them using 4% acetic acid (V/V) as food simulate, the heavy metal content in food simulates was detected by Inductively Coupled Plasma Mass Spectrometry (ICP-MS), so that we can get the migration characteristics of heavy metal. The results show that different aging conditions can do harm to the structure of PET in varying degrees by changing its crystallinity and molecules arrangement. But the difference of crystallinity has no obvious effect on Sb migration characteristic of PET samples. While, the migration quantity of Sb increases significantly with the increase of migrate temperature. It will provide an important reference to the evaluation of use security and service life of PET in real usage to study the relation between heavy metal migration features and aging degree. © 2016 Trans Tech Publications, Switzerland.