PBAT全生物降解地膜在土壤试验中的降解行为研究

研究了以聚己二酸/对苯二甲酸丁二酯(PBAT)为主要原料的全生物降解地膜在实地埋土降解实验过程中的降解行为.采用红外光谱、X射线光电子能谱、凝胶渗透色谱、热失重分析、扫描电子显微镜对PBAT薄膜在降解过程中化学结构、表面元素、热稳定性、表面微观形貌以及分子量的变化进行分析.结果表明,随埋土时间的延长,PBAT地膜红外光...

Degradation behaviors of PBAT biodegradable mulch in soil

This paper focused on the degradation behaviors of poly （butylene?adipate?co?terephthalate） （PBAT） mulch under the soil?buried condition. Fourier transform infrared spectroscopy （FTIR）， X?ray photoelectron spectroscopy， thermogravimetric analysis， scanning electron microscopy， and gel permeation chromatography were conducted to analyze the changes of chemical structure， surface element analysis， thermal stability， surface micro?morphology， and molecular weight of PBAT films during the degradation process. After bury for four months， the FTIR spectra of PBAT showed attenuation in the intensity of C—O absorption peaks due to the broken ester bond in their molecular chains. The atomic ratio of O to C increased from 0.27 to 0.77， whereas the bonding energy of these elements decreased. The thermal stability of PBAT decreases due to the changes of aggregation state. The results indicated that the degradation of PBAT occurred at the molecular level during the burying experiment， resulting in a complete degradation of the whole biodegradable membrane in the soil.