羧甲基纤维素凝胶对乙草胺的控制释放研究  

Controlled Release of Acetochlor from Carboxylmethylcellulose Gels

作　　者：李建法[1] 吕金红[1] 李凡利[1] 

机构地区：[1]绍兴文理学院化学系,浙江绍兴312000

出　　处：《林产化学与工业》2008年第4期13-16,共4页Chemistry and Industry of Forest Products

基　　金：浙江省自然科学基金(Y307106)

摘　　要：羧甲基纤维素(CMC)经Fe3+交联得到的凝胶载体可以有效延缓除草剂乙草胺的释放速率,有助于减轻农药污染。采用50%乙草胺被释放所需时间(t50)衡量乙草胺的释放速率,结果表明乙草胺由水凝胶中释放的t50值不足8h。将CMC水凝胶干燥处理可以使t50值提高到100h以上,同时制剂中的载药量越少释放速度越慢。采用控制释放模型对释放动力学数据进行分析得到,乙草胺从干凝胶中的释放主要由扩散机理控制。红外光谱分析证实了乙草胺与CMC之间主要通过氢键结合。Release of the herbicide acetochlor was controlled by encapsulating it into the gel carrier that was obtained from the crosslinking of carboxylmethylcellulose （CMC） with Fe^3＋ ions, which is beneficial for reducing contamination of herbicides. The required time for 50 % of acetochlor released into water （t50） was used to compare the release rate. The results indicated that, the t50 values from CMC hydrogels were below 8 h, but the values from dried gels were improved to 100 h. The less amount of herbicide loading in gel formulations resulted in a slower release rate. The release data were analyzed with a controlled release model, and the results indicated that the release of herbicide from dried gels was dominated by a diffusion mechanism. IR spectrum confirmed the interaction between CMC macromolecules and acetochlor through hydrogen bonding.

关 键 词：羧甲基纤维素 控制释放 除草剂 凝胶 

分 类 号：TQ34[化学工程—化纤工业]