本文選題：微膠囊　切入點(diǎn)：聚電解質(zhì)　出處：《長春工業(yè)大學(xué)》2017年碩士論文

【摘要】：微膠囊是以天然或合成高分子為殼層,包封固體、液體或氣體芯材形成核殼形態(tài)的功能性材料。高分子半透膜形成的微膠囊在保護(hù)囊內(nèi)物質(zhì)免受環(huán)境條件的影響的同時(shí),還可控制膜內(nèi)外物質(zhì)交換,在控制-釋放領(lǐng)域具有重要應(yīng)用價(jià)值。本文以淀粉為主體基材,利用相反電荷聚電解質(zhì)之間的相互作用制備了淀粉基聚電解質(zhì)微膠囊,研究不同囊內(nèi)結(jié)構(gòu)對包埋物緩釋行為的影響。具體包括如下內(nèi)容:1、利用陽離子淀粉與聚丙烯酸之間的靜電相互作用,制備了可用于包裹2,4-D乳液的聚電解質(zhì)微膠囊,系統(tǒng)地考查了不同制備條件對聚電解質(zhì)微膠囊微觀形態(tài)的影響,研究了不同緩釋環(huán)境對包埋在微膠囊內(nèi)部2,4-D控制釋放行為的影響,提出了通過靜電相互作用制備聚電解質(zhì)微膠囊的形成機(jī)理。研究結(jié)果表明:當(dāng)pH值為4、溫度為15℃、鹽濃度為1.5%(w/w)時(shí),2,4-D的釋放速度最慢,所以對于包埋的2,4-D可以起到控制釋放的作用。2、以卡拉膠為凝膠劑,三氯化鐵為膨脹抑制劑,將聚電解質(zhì)微膠囊內(nèi)部的水核改變?yōu)槟z核,在提高聚電解質(zhì)微膠囊機(jī)械強(qiáng)度的同時(shí),制備具有多層結(jié)構(gòu)的聚電解質(zhì)微膠囊,研究其對小分子化肥-尿素的緩釋性能。研究結(jié)果表明:卡拉膠加入量為0.5g,三氯化鐵的濃度為0.05M,交聯(lián)時(shí)間為30min時(shí),制備的微膠囊對尿素的緩釋性能最佳。
[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，

本文編號：1687749