Bi Siwen, Barinelli Vincenzo, Sobkowicz Margaret J
Department of Plastics Engineering, University of Massachusetts, Lowell, MA 01854, USA.
Polymers (Basel). 2020 Feb 2;12(2):301. doi: 10.3390/polym12020301.
In this work, biodegradable polymers were melt compounded with urea phosphate to fabricate "smart fertilizers" for sustainable agriculture. Urea phosphate (UP) is typically applied as a water-soluble fertilizer to treat phosphorus deficiency in high pH soils. Due to the low diffusion rate of phosphate through slow-release fertilizer coatings, phosphate supply has been considered the "bottleneck" for nitrogen-phosphorous-potassium (NPK) nutrients supply. We study the influence of polymer matrix structure on release kinetics in deionized water using novel polyesters including poly (hexamethylene succinate) (PHS), poly (30% butylene succinate-co-70% hexamethylene succinate) (PBHS 30/70), and PBHS 70/30. Melt processed composites of UP and polyester were analyzed to determine UP loading efficiency and dispersion and distribution of the salt in the polymer matrix. A combined empirical model involving diffusion and erosion mechanisms was found have a good agreement with the experimental release curve. This work provides a solution for environmentally friendly controlled release phosphate fertilizer with good release performance using bio-based and biodegradable polymers.
在这项工作中，将可生物降解的聚合物与磷酸脲熔融共混，以制造用于可持续农业的“智能肥料”。磷酸脲（UP）通常用作水溶性肥料，用于处理高pH值土壤中的磷缺乏问题。由于磷酸盐通过缓释肥料涂层的扩散速率较低，磷酸盐供应被认为是氮磷钾（NPK）养分供应的“瓶颈”。我们使用新型聚酯，包括聚己二酸己二酯（PHS）、聚（30%丁二酸丁二醇酯-co-70%己二酸己二酯）（PBHS 30/70）和PBHS 70/30，研究聚合物基体结构对去离子水中释放动力学的影响。对UP和聚酯的熔融加工复合材料进行分析，以确定UP的负载效率以及盐在聚合物基体中的分散和分布情况。发现一个涉及扩散和侵蚀机制的综合经验模型与实验释放曲线吻合良好。这项工作为使用生物基和可生物降解聚合物的具有良好释放性能的环保型控释磷肥提供了一种解决方案。
