Poly (ethylene glycol-co-cyclohexane 1,4-dimethanol terephthalate) (PETG) is a newly developed copolyester. The thermal degradation of PETG was investigated by pyrolysis-gas chromatography/mass spectroscopy (PY-GC/MS)...Poly (ethylene glycol-co-cyclohexane 1,4-dimethanol terephthalate) (PETG) is a newly developed copolyester. The thermal degradation of PETG was investigated by pyrolysis-gas chromatography/mass spectroscopy (PY-GC/MS). The pyrolytic gas of PETG at temperatures 300 C, 400 C ,500 C,600 C and 700 C were identified, respectively. The results showed that the pyrolysis products are very different at diferent pyrolysis temperature. At 600 C, the pyrolysis products of PETG were characteristic of PETG composition, which can be used to determine the polymer chemical structure.展开更多
目的建立热裂解-气相色谱-质谱法(pyrolysis-gas chromatography mass spectrometry,PY-GC-MS)快速筛查和定量分析乳与乳制品中的4种微塑料(microplastics,MPs)的方法。方法以聚碳酸酯(polycarbonate,PC)、聚对苯二甲酸乙二醇酯(polyeth...目的建立热裂解-气相色谱-质谱法(pyrolysis-gas chromatography mass spectrometry,PY-GC-MS)快速筛查和定量分析乳与乳制品中的4种微塑料(microplastics,MPs)的方法。方法以聚碳酸酯(polycarbonate,PC)、聚对苯二甲酸乙二醇酯(polyethylene terephthalate,PET)、聚酰胺6(polyamide 6,PA6)和聚酰胺66(polyamide 66,PA66)4种微塑料粒子为例,采用红外光谱和粒度分析对微塑料形貌进行表征。考察进样模式、裂解温度对裂解效果的影响,并对4种微塑料的特征定量峰进行比较,最终选择单击式裂解模式,裂解温度600℃,4种微塑料的特征物质分别为双酚A、对苯二甲酸-2-苯甲酰氧基乙酯乙烯酯、己内酰胺和环戊酮。验证裂解方法的稳定性和特异性,利用高温裂解产生的特征碎片离子进行定量分析。结果本方法对4种微塑料检测的线性范围为2~64μg与4~64μg(PET),检出限为0.1~1.2μg,定量限为0.3~4.0μg,平均加标回收率为79.5%~96.0%,精密度为1.74%~10.80%。结论本方法适用于乳与乳制品中微塑料的检测,也可以进一步优化条件应用到其他类型的微塑料检测过程,作为微塑料浓度检测标准制定的参考方法。展开更多
文摘Poly (ethylene glycol-co-cyclohexane 1,4-dimethanol terephthalate) (PETG) is a newly developed copolyester. The thermal degradation of PETG was investigated by pyrolysis-gas chromatography/mass spectroscopy (PY-GC/MS). The pyrolytic gas of PETG at temperatures 300 C, 400 C ,500 C,600 C and 700 C were identified, respectively. The results showed that the pyrolysis products are very different at diferent pyrolysis temperature. At 600 C, the pyrolysis products of PETG were characteristic of PETG composition, which can be used to determine the polymer chemical structure.
