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Zheng W, Liu C, Wei X, Sun W, Zhao L. Molecular-level Swelling Behaviors of Poly (ethylene terephthalate) Glycolysis using Ionic Liquids as Catalyst. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.118329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Evaluation of force-carbonated Czech-type lager beer quality during storage in relation to the applied type of packaging. Food Control 2019. [DOI: 10.1016/j.foodcont.2019.106706] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Li B, Wang ZW, Lin QB, Hu CY. Molecular dynamics simulation of three plastic additives' diffusion in polyethylene terephthalate. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2017; 34:1086-1099. [PMID: 28346078 DOI: 10.1080/19440049.2017.1310398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Accurate diffusion coefficient data of additives in a polymer are of paramount importance for estimating the migration of the additives over time. This paper shows how this diffusion coefficient can be estimated for three plastic additives [2-(2'-hydroxy-5'-methylphenyl) (UV-P), 2,6-di-tert-butyl-4-methylphenol (BHT) and di-(2-ethylhexyl) phthalate (DEHP)] in polyethylene terephthalate (PET) using the molecular dynamics (MD) simulation method. MD simulations were performed at temperatures of 293-433 K. The diffusion coefficient was calculated through the Einstein relationship connecting the data of mean-square displacement at different times. Comparison of the diffusion coefficients simulated by the MD simulation technique, predicted by the Piringer model and experiments, showed that, except for a few samples, the MD-simulated values were in agreement with the experimental values within one order of magnitude. Furthermore, the diffusion process for additives is discussed in detail, and four factors - the interaction energy between additive molecules and PET, fractional free volume, molecular shape and size, and self-diffusion of the polymer - are proposed to illustrate the microscopic diffusion mechanism. The movement trajectories of additives in PET cell models suggested that the additive molecules oscillate slowly rather than hopping for a long time. Occasionally, when a sufficiently large hole was created adjacently, the molecule could undergo spatial motion by jumping into the free-volume hole and consequently start a continuous oscillation and hop. The results indicate that MD simulation is a useful approach for predicting the microstructure and diffusion coefficient of plastic additives, and help to estimate the migration level of additives from PET packaging.
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Affiliation(s)
- Bo Li
- a Packaging Engineering Institute , Jinan University , Zhuhai , China.,b Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes , Jinan University , Zhuhai , China.,c Zhuhai Key Laboratory of Product Packaging and Logistics , Jinan University , Zhuhai , China
| | - Zhi-Wei Wang
- a Packaging Engineering Institute , Jinan University , Zhuhai , China.,b Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes , Jinan University , Zhuhai , China.,c Zhuhai Key Laboratory of Product Packaging and Logistics , Jinan University , Zhuhai , China
| | - Qin-Bao Lin
- a Packaging Engineering Institute , Jinan University , Zhuhai , China.,b Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes , Jinan University , Zhuhai , China.,c Zhuhai Key Laboratory of Product Packaging and Logistics , Jinan University , Zhuhai , China
| | - Chang-Ying Hu
- b Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes , Jinan University , Zhuhai , China.,c Zhuhai Key Laboratory of Product Packaging and Logistics , Jinan University , Zhuhai , China.,d Department of Food Science and Engineering , Jinan University , Guangzhou , China
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