淀粉基聚电解质微胶囊的制备及缓释性能研究

发布时间：2018-03-30 21:40

  本文选题：微胶囊　切入点：聚电解质　出处：《长春工业大学》2017年硕士论文

【摘要】：微胶囊是以天然或合成高分子为壳层,包封固体、液体或气体芯材形成核壳形态的功能性材料。高分子半透膜形成的微胶囊在保护囊内物质免受环境条件的影响的同时,还可控制膜内外物质交换,在控制-释放领域具有重要应用价值。本文以淀粉为主体基材,利用相反电荷聚电解质之间的相互作用制备了淀粉基聚电解质微胶囊,研究不同囊内结构对包埋物缓释行为的影响。具体包括如下内容:1、利用阳离子淀粉与聚丙烯酸之间的静电相互作用,制备了可用于包裹2,4-D乳液的聚电解质微胶囊,系统地考查了不同制备条件对聚电解质微胶囊微观形态的影响,研究了不同缓释环境对包埋在微胶囊内部2,4-D控制释放行为的影响,提出了通过静电相互作用制备聚电解质微胶囊的形成机理。研究结果表明:当pH值为4、温度为15℃、盐浓度为1.5%(w/w)时,2,4-D的释放速度最慢,所以对于包埋的2,4-D可以起到控制释放的作用。2、以卡拉胶为凝胶剂,三氯化铁为膨胀抑制剂,将聚电解质微胶囊内部的水核改变为凝胶核,在提高聚电解质微胶囊机械强度的同时,制备具有多层结构的聚电解质微胶囊,研究其对小分子化肥-尿素的缓释性能。研究结果表明:卡拉胶加入量为0.5g,三氯化铁的浓度为0.05M,交联时间为30min时,制备的微胶囊对尿素的缓释性能最佳。
[Abstract]:Microencapsulation is a functional material with natural or synthetic polymer as shell layer, encapsulating solid, liquid or gas core material to form core-shell shape. The microcapsule formed by polymer semi-permeable film can protect the material in the capsule from the influence of environmental conditions at the same time. It can also control the material exchange inside and outside the film, which has important application value in the field of control-release. In this paper, starch was used as the main substrate to prepare starch based polyelectrolyte microcapsules by the interaction of opposite charge polyelectrolyte. The effects of different intravesicular structures on the sustained release behavior of the encapsulated materials were studied, including the following contents: 1. Using the electrostatic interaction between cationic starch and polyacrylic acid, polyelectrolyte microcapsules were prepared for encapsulating 24-D emulsion. The effects of different preparation conditions on the micromorphology of polyelectrolyte microcapsules were systematically investigated, and the effects of different slow-release environments on the controlled release behavior of 24-D embedded in the microcapsules were studied. The formation mechanism of polyelectrolyte microcapsules by electrostatic interaction has been proposed. The results show that the release rate of PEC 24-D is the slowest when pH is 4, temperature is 15 鈩，

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