聚乳酸
热重分析
差示扫描量热法
纳米纤维
静电纺丝
尿素
材料科学
化学工程
纤维
聚合物
分光光度法
膜
同轴
傅里叶变换红外光谱
扫描电子显微镜
肥料
核化学
高分子化学
可生物降解聚合物
纳米-
纳米尺度
化学
作者
Haoyuan Tan,Yuhan Zhang,Lixian Sun,Youli Sun,Hongbo Dang,Yanhua Yang,Dong Jiang
标识
DOI:10.1016/j.ijbiomac.2021.10.181
摘要
Polylactic acid (PLA) is a novel biodegradable material that is widely used in fields like medicine, petrochemicals, disposable products, and has played significant role in the fast-growing agriculture sector in recent years. In this study, nanoscale sustained-release urea fiber materials were successfully fabricated by coaxial electrospinning by encapsulating urea inside polylactic acid fibers. The effects of different concentrations of PLA and urea on the preparation of fibrous membranes as well as the effects of different concentrations of PH and variations in temperature on the sustained release were investigated. The experimental results showed that the proposed method was feasible and the urea fiber membranes acidic and basic conditions as well as elevated temperatures. The sustained release time for the urea was as long as 84 d. Scanning electron microscopy and Fourier transform infrared spectrophotometry were employed to characterize the morphology of the electrospun nanofibers. Thermogravimetric analysis and differential scanning calorimetry showed that the release system was thermally stable up to a temperature of 126 °C, and urea concentration was determined by UV-Vis spectrophotometry. This method has broad application prospects in agricultural production and provides a more rational fertilizer choice for soil-free cultivation.
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