食品科学2023，Vol.44Issue(24)：306-315,10.DOI:10.7506/spkx1002-6630-20221011-100
物理回收下再生聚对苯二甲酸乙二醇酯的物理表征及挥发性有机化合物监测
Physical Characterization and Volatile Organic Compound Monitoring of Recycled Polyethylene Terephthalate under Mechanical Recycling
摘要
Abstract
In this study,physical characterization and monitoring of volatile organic compounds(VOCs)were investigated on recycled polyethylene terephthalate(rPET)from a mechanical recycling process and rPET bottles made with different rPET contents,with the aim of tracing the source of rPET and assessing its safety when use as a food contact material.It was found that rPET had a similar thermal stability to that of virgin PET(vPET).rPET bottles did not show any significant changes in groups or structure and exhibit similar crystallization and melting behaviors to vPET.However,there were minor mechanical scratches in the surface micromorphology of rPET bottles,and the color of rPET bottles became darker,greener and yellower as the content of recycled material increased.The solid-state polycondensation process was found to play an important role in the removal of VOCs,as detected by headspace gas chromatography-mass spectrometry(HS-GC-MS),resulting in a very small amount of residual VOCs in rPET.Four VOCs(acetaldehyde,glycol and nonanal at levels less than 1.00 mg/kg;2-methyl-1,3 dioxolane at levels of 1.72-5.76 mg/kg)were detected in the rPET bottles.This study shows that rPET bottles are qualified for reuse in food contact in terms of thermal properties,structure,morphology and VOC residues,although there is variability in color.关键词
物理回收/回收聚对苯二甲酸乙二醇酯/物理表征/挥发性有机化合物/食品接触材料Key words
mechanical recycling/recycled polyethylene terephthalate/physical characterization/volatile organic compounds/food contact materials分类
轻工业引用本文复制引用
曾严,金莉莉,朱蕾,吴永宁,罗世鹏,商贵芹,王志伟,刘桂华,胡长鹰..物理回收下再生聚对苯二甲酸乙二醇酯的物理表征及挥发性有机化合物监测[J].食品科学,2023,44(24):306-315,10.基金项目
国家自然科学基金国际(地区)合作与交流项目(32061160474) （地区）
江苏省自然科学基金资助项目-青年基金项目(BK20201109) （BK20201109）
