Abstract In this paper, thermal degradation of medical plastic waste (the blends of medicinal plastic bottles and plastic infusion bag) that mainly composed of polystyrene (PS) and polypropylene (PP) is studied under both inert and oxidative atmospheres using in-situ FTIR, TG-MS and TG-GC/MS coupled analyses. Meanwhile, the gas evolution profiles as well as the function groups of the decomposition residues during medical plastic waste thermal degradation are also discussed. The aliphatic C H, aromatic C C and aromatic C H exhibit the dramatically vary with temperature, indicating the medical plastic waste begins vitrifying at about 100 °C, starts degrading around 300 °C and reaches to the maximum near 400 °C in inert atmosphere, produces mainly styrene, benzene, toluene, and small amounts of C1–C4 aliphatic hydrocarbons as the initial pyrolysis products. The aromatic compounds are mainly ascribed to PS degradation, and alkanes and alkenes are mainly originated from PP creaking. It is also found that the gaseous evolution profiles are well consistent with DTG curves in terms of appearance of peaks and relevant stages in the whole temperature range. Compared with thermal degradation of medical plastic waste in inert atmosphere, the initial degradation temperature for the medical plastic waste is shifted to lower temperature, while the degradation rate is reduced significantly in the oxidative atmosphere that produces oxygenated hydrocarbons such as acetic acid, phenol and benzoic acid due to the O-atom attack. Lastly, the initial creaking mechanism together with the secondary reaction pathways of the primary volatiles produced from medical plastic waste thermal degradation are also proposed.

中文翻译：

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通过原位 FTIR、TG-MS 和 TG-GC/MS 耦合分析热降解医用塑料废物

摘要 本文利用原位 FTIR 研究了主要由聚苯乙烯 (PS) 和聚丙烯 (PP) 组成的医用塑料废物（药用塑料瓶和塑料输液袋的混合物）在惰性和氧化气氛下的热降解， TG-MS 和 TG-GC/MS 耦合分析。同时，还讨论了医用塑料废物热降解过程中的气体逸出曲线以及分解残留物的功能组。脂肪族CH、芳香族CC和芳香族CH随温度变化显着，说明医用塑料废物在100℃左右开始玻璃化，300℃左右开始降解，在惰性气氛中400℃附近达到最大值，主要产生苯乙烯、苯、甲苯、和少量的 C1-C4 脂肪烃作为初始热解产物。芳香族化合物主要归因于 PS 降解，烷烃和烯烃主要来源于 PP 的吱吱声。还发现，在整个温度范围内，就峰的出现和相关阶段而言，气体演化曲线与DTG曲线非常一致。与在惰性气氛中热降解医用塑料垃圾相比，医用塑料垃圾的初始降解温度向较低的温度转移，而在产生乙酸、苯酚和苯甲酸等含氧烃的氧化气氛中降解速率显着降低。酸是由于 O 原子攻击。最后，