Preparation of mechanically activated starch-based composite hydrogel for controlled release of urea

doi:10.3969/j.issn.0438-1157.2013.09.047

CIESC Journal ›› 2013, Vol. 64 ›› Issue (9): 3428-3436.DOI: 10.3969/j.issn.0438-1157.2013.09.047

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Preparation of mechanically activated starch-based composite hydrogel for controlled release of urea

LIANG Xingtang¹, HU Huayu², ZHANG Yanjuan³, LIU Zijie¹, HUANG Zuqiang², HUANG Aimin²

1. School of Chemistry and Chemical Engineering, Qinzhou University, Qinzhou 535000, Guangxi, China;
2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, China;
3. Guangxi Research Institute of Chemical Industry, Nanning 530001, Guangxi, China

Received:2013-01-23 Revised:2013-04-01 Online:2013-09-05 Published:2013-09-05
Supported by:
supported by Scientific Research and Technological Development Project of Guangxi(11107022-4).

机械活化淀粉制备水凝胶及其尿素的控释性

梁兴唐¹, 胡华宇², 张燕娟³, 刘子杰¹, 黄祖强², 黄爱民²

1. 钦州学院化学化工学院, 广西钦州 535000;
2. 广西大学化学化工学院, 广西南宁 530004;
3. 广西化工研究院, 广西南宁 530001

通讯作者: 黄祖强
作者简介:梁兴唐(1982- ),男,讲师。
基金资助:
广西科学研究与技术开发项目(桂科攻11107022-4)。

Abstract

Abstract: The starch based ionic and nonionic composite superabsorbent(SCSA)used for agriculture was synthesized from mechanically activated cassava starch(60 min ball milling),partially neutralized acrylic acid by KOH and acrylamide.The functional groups and granular morphology of the samples were characterized by FT-IR and SEM,respectively.The SCSA was swollen in urea solution(5.0 mol·L^-1)until equilibrium swelling and then the hydrogel(SCH)was obtained.The SCH was used as the release material for urea in aqueous solution.The effects of synthesis conditions and release environment on the release process were investigated.It was found that the release of urea from SCH was controlled by Fickian diffusion mechanism,and the release rate decreased with increasing swelling ratio and increased with increasing temperature.The activation energy for releasing urea from the SCH prepared under the conditions of m_AA:m_AM=3:3 and dosage of N,N'-methylenebisacrylamide solution 1.0 ml(0.02 mol·L^-1)was 17.28 kJ·mol^-1.

Key words: mechanical activation, starch, composite hydrogel, urea, release

摘要： 以机械活化60 min的木薯淀粉、氢氧化钾部分中和的丙烯酸和丙烯酰胺为原料,合成农用淀粉基离子/非离子型复合高吸水树脂(SCSA),采用FT-IR和SEM对样品的官能团和表面形貌进行表征。以SCSA在5.0 mol·L^-1的尿素溶液中平衡溶胀后所得的水凝胶(SCH)为尿素在水溶液中的释放材料,考察合成工艺条件和释放环境对尿素释放过程的影响。结果表明,尿素从SCH中的释放过程符合Fickian扩散机理;SCH的溶胀率越大,尿素的释放速率越慢;释放温度越高,尿素的释放越快。在丙烯酸和丙烯酰胺质量比为3:3,交联剂N,N'-亚甲基双丙烯酰胺溶液用量为1.0 ml(浓度为0.02 mol·L^-1)的条件下制备的SCH对尿素的释放活化能为17.28 kJ·mol^-1。

关键词: 机械活化, 淀粉, 复合水凝胶, 尿素, 释放

CLC Number:

LIANG Xingtang, HU Huayu, ZHANG Yanjuan, LIU Zijie, HUANG Zuqiang, HUANG Aimin. Preparation of mechanically activated starch-based composite hydrogel for controlled release of urea[J]. CIESC Journal, 2013, 64(9): 3428-3436.

梁兴唐, 胡华宇, 张燕娟, 刘子杰, 黄祖强, 黄爱民. 机械活化淀粉制备水凝胶及其尿素的控释性[J]. 化工学报, 2013, 64(9): 3428-3436.

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Preparation of mechanically activated starch-based composite hydrogel for controlled release of urea

机械活化淀粉制备水凝胶及其尿素的控释性

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