| PBAT全生物降解地膜降解特征 |
| 摘要点击 1165 全文点击 182 投稿时间：2023-12-27 修订日期：2024-04-09 |
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| 中文关键词 聚己二酸/对苯二甲酸丁二醇酯（PBAT） 宏观 微观 CO2 降解特征 地膜 |
| 英文关键词 poly（butyleneadipate-co-terephthalate）（PBAT） bacroscopic bicroscopic CO2 degradation characteristics mulch film |
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| 中文摘要 |
| 全生物降解地膜代替传统塑料地膜是解决“白色污染”的重要研究方向,但其是否能够真正实现生物降解仍是众多学者研究的焦点.以聚己二酸/对苯二甲酸丁二醇酯（PBAT）全生物降解地膜和普通聚乙烯地膜（PE）为研究对象,以不覆膜（CK）为对照,在宁夏回族自治区平罗县开展田间试验和室内试验,观察地膜表观开裂程度、地膜面积损失以及失重率等宏观特征,结合扫描电镜（SEM）、傅里叶红外光谱（FTIR）、热重分析（TG）和CO2释放量等微观特征,综合探究PBAT在银北灌区的降解特征,为其大面积推广提供数据支撑.结果表明,宏观上, PBAT地膜覆盖60 d已经开始破裂,PBAT处理110 d后地膜面积损失率为27.92%,质量损失率（失重率）达到19.04%,均远大于PE地膜.微观上,综合SEM、FTIR图谱以及热重分析,在包埋110 d后,PE地膜无明显变化,而PBAT表面结构发生很大变化,层状结构更加明显,酯基结构发生改变,热稳定性变差.室内模拟试验发现,培养90 d后,PBAT地膜的矿化率为18.30%,接近树叶的矿化率,而PE地膜几乎无矿化. |
| 英文摘要 |
| Replacing traditional plastic mulch with fully biodegradable mulch is an important research direction to solve the problem of “white pollution,” but whether it can truly realize biodegradation is still the focus of many scholars. In this study, field and indoor experiments were carried out in Pingluo County, Ningxia Hui Autonomous Region, using poly（butyleneadipate-co-terephthalate） （PBAT） fully biodegradable mulch film and ordinary polyethylene （PE） mulch film, with no mulch film （CK） as the control. Macroscopic characteristics such as the degree of apparent cracking of the mulch film, loss of the mulch film area, and the rate of weight loss were observed, and the results were combined with the results of scanning electron microscopy （SEM）, Fourier transform infrared spectroscopy （FTIR）, and thermogravimetry （TGR）. Combined with microscopic features such as SEM, FTIR, thermogravimetric analysis （TG）, and CO2 release, the degradation characteristics of PBAT in the irrigation area of Yinbei District were comprehensively investigated, and data support was provided for the promotion of PBAT on a large scale. The results showed that, macroscopically, the PBAT film had begun to rupture after 60d of covering, the loss rate of film area was 27.92%, and the mass loss rate reached 19.04% after 110d of PBAT treatment, which was much larger than those of PE film. Microscopically, the SEM, FTIR, and thermogravimetric analyses showed that there was no obvious change in PE film after 110d of embedding, while the surface structure of PBAT changed greatly, with a more obvious lamellar structure, altered ester base structure, and deteriorated thermal stability. The indoor simulation test showed that the mineralization rate of PBAT film was 18.30% after 90d of incubation, which was close to that of leaves, while PE film had almost no mineralization. |
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