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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (16): 1910-1916. 上一篇    下一篇

研究论文

温度/pH敏感性接枝共聚物水凝胶P(DMAEMA-g-NIPAM)的 合成及性质研究

刘守信* 张朝阳 房 喻 王焕霞 陈奋强

  

  1. (应用表面与胶体化学教育部重点实验室 陕西师范大学化学与材料科学学院 西安 710062)

  • 投稿日期:2008-08-13 修回日期:2008-12-18 发布日期:2009-08-28
  • 通讯作者: 刘守信

Synthesis and Characterization of Temperature- and pH-sensitive Poly[2-(N,N-dimethylamino)ethyl methacrylate-g-N- isopropylacrylamide)] Hydrogels

Liu, Shouxin* Zhang, Zhaoyang Fang, Yu Wang, Huanxia Chen, Fenqiang   

  1. (Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, School of Chemistry and
    Materials Science, Shaanxi Normal University, Xi’an 710062)
  • Received:2008-08-13 Revised:2008-12-18 Published:2009-08-28
  • Contact: Liu, Shouxin

PDF

2762

被引次数

28

利用大分子单体技术, 采用自由基溶液聚合合成了温度/pH敏感性聚甲基丙烯酸-N,N-二甲氨基乙酯接枝聚N-异丙基丙烯酰胺[P(DMAEMA-g-NIPAM)]水凝胶. 用红外光谱及扫描电镜对凝胶的组成及形貌进行了表征. 凝胶的去溶胀和溶胀动力学研究表明, 所合成的凝胶具有温度和pH敏感性. 与传统的聚丙烯酸系水凝胶相比, P(DMAEMA-g- NIPAM)具有相反的pH敏感性; P(DMAEMA-g-NIPAM)凝胶在55 ℃时具有较快的去溶胀速率, 随着凝胶中接枝链PNIPAM量的增加, 凝胶的去溶胀速率加快.

关键词: 甲基丙烯酸-N,N-二甲氨基乙酯, N-异丙基丙烯酰胺, 接枝水凝胶

A novel temperature- and pH-sensitive graft copolymer hydrogel composed of 2-(N,N- dimethylamino)ethyl methacrylate (DMAEMA) and N-isopropylacrylamide (NIPAM) was synthesized by macromonomer technique and free radical solution polymerization. The composition and surface morphology of the hydrogels were investigated by means of Fourier transform infrared spectroscopy and scanning electron microscopy. The deswelling and swelling kinetics of the graft copolymer hydrogels in different pH media at different temperatures demonstrate that the graft copolymer hydrogels have temperature and pH double sensitivities. Compared with conventional polyacrylic acid hydrogels, the pH sensitivity of synthesized hydrogels is contrary and the hydrogels are in swollen state in acid medium. The P(DMAEMA-g-NIPAM) hydrogels have a faster deswelling rate at 55 ℃, and the more the PNIPAM graft chain contents in the hydrogels are, the faster the deswelling rate of the hydrogels is.

Key words: 2-(N,N-dimethylamino)ethyl methacrylate, N-isopropylacrylamide, graft copolymer hydrogel