PBAT全生物降解地膜在土壤试验中的降解行为研究  

Degradation behaviors of PBAT biodegradable mulch in soil

作　　者：管彤晖 付烨 翁云宣[1,2] GUAN Tonghui;FU Ye;WENG Yunxuan(College of Chemistry and Materials Engineering,Beijing Technology and Business University,Beijing 100048,China;Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics,Beijing 100048,China)

机构地区：[1]北京工商大学化学与材料工程学院,北京100048 [2]塑料卫生与安全质量评价技术北京市重点实验室,北京100048

出　　处：《中国塑料》2022年第1期67-72,共6页China Plastics

基　　金：国家自然科学基金(52073004)。

摘　　要：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地膜红外光谱中C—O吸收峰的峰强减弱,分子链中酯键发生断裂;表面O/C原子个数比由0.27升高至0.77,结合能下降,热稳定性降低,聚集态发生改变;在埋土实验过程中,PBAT发生了分子级别的降解过程,以PBAT为主要原料的全生物降解膜在埋土实验中可完全降解。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.

关 键 词：聚乙二酸/对苯二甲酸丁二酯 地膜 降解 土壤 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]