化学学报 ›› 2009, Vol. 67 ›› Issue (16): 1929-1935. 上一篇    下一篇

研究论文

大孔PAMPS/PVA半互穿网络型水凝胶的制备及其性能研究

袁丛辉a 林松柏*,a,b 柯爱茹a 刘 博a 全志龙a

  

  1. (a华侨大学材料科学与工程学院 泉州 362021)
    (b黎明职业大学 泉州 362000)

  • 投稿日期:2008-09-24 修回日期:2009-02-14 发布日期:2009-08-28
  • 通讯作者: 林松柏

Preparation and Property Characterization of Macroporous PAMPS/PVA S-IPN Hydrogels

Yuan, Conghuia Lin, Songbai*,a,b Ke, Airua Liu, Boa Quan, Zhilonga

  

  1. (a College of Material Science and Engineering, Huaqiao University, Quanzhou 362021)
    (b Liming Vocational University, Quanzhou 362000)
  • Received:2008-09-24 Revised:2009-02-14 Published:2009-08-28
  • Contact: Lin Songbai

以PEG6000为成孔剂, 合成了大孔聚(2-丙烯酰胺-2-甲基丙磺酸)/聚乙烯醇半互穿网络型(s-IPN)水凝胶. 红外分析表明, PVA与PAMPS之间形成了较强的氢键, 使得PVA分子上的C—O伸缩振动吸收峰移向了低波数处. X射线衍射分析发现, 当PVA用量较高时, 由于部分的PVA结晶, 使得凝胶的半互穿网络结构不均匀. 电镜分析结果表明, 没有使用成孔剂的凝胶表面成褶皱形, 不存在任何孔洞结构; 而以PEG6000为成孔剂的凝胶表面存在相互贯穿的大孔结构. 研究了该水凝胶的溶胀性能, 结果表明, 该水凝胶的平衡溶胀度在116至320之间; 而成孔剂PEG6000的加入能较大幅度提高凝胶的溶胀速率, 凝胶在240 min之内就能达到溶胀平衡. 对凝胶抗压缩性能的研究表明, 当PVA用量为9.1% (w)时, 凝胶的抗压缩强度最大, 可达12.0 MPa; 而成孔剂的加入会在一定程度削弱凝胶的抗压缩强度. 该凝胶具有较好的电场敏感性, 研究发现, 将吸去离子水达到溶胀平衡的凝胶放入施加有电场的0.2 mol•L-1 NaCl溶液中时, 凝胶迅速偏向阳极. 而PVA和成孔剂PGE6000的用量均对凝胶的偏转速度以及最大偏转角存在较大的影响.

关键词: 水凝胶, 半互穿网络, 抗压缩性能, 电场敏感性

Semi-interpenetrating polymer network (s-IPN) hydrogels composed of poly(vinyl alcohol) (PVA), and poly(2-acrylamido-2-methylpropylsulfonic acid) (PAMPS) were prepared by radical polymerization using PEG6000 as pore-forming agent during the reaction process. Fourier-transform infrared (FT-IR) spectroscopy was used to confirm the chemical structure of the s-IPN hydrogels, in which the peak of C—O stretching flows to low wave numbers. This was attributed to the formation of strong hydrogen bond between PVA and PAMPS. The crystallinity properties of s-IPN hydrogels were investigated by X-ray diffraction spectrography (XRD). The results show that the s-IPN structure of the hydrogels becomes inhomogeneous when the dosage of PVA is high because of the crystallization of PVA. SEM macrographs revealed that a macroporous structure was formed with the addition of pore-forming agent PEG6000. The swelling properties of the s-IPN hydrogels were studied, showing that the equilibrium swelling ratio of the s-IPN hydrogels ranges from 116 to 320. The swelling speed of the s-IPN hydrogels increased significantly with the addition of PEG6000, and the hydrogel could reach its equilibrium swelling ratio within 240 min. Stress strength of the s-IPN hydrogels was also studied, showing that when the content of PVA was 9.1% (w), the hydrogel reached its maximum stress strength (12.0 MPa). However the stress strength of the hydrogels decreased with increasing the dosage of PEG. This s-IPN hydrogel exhibits significant electrical sensitivity, when a piece of deionized water swollen hydrogel was placed in 0.2 mol•L-1 NaCl solution under an applied voltage, the hydrogel bent toward the anode quickly. Further investigation shows that both the bending speed and the maximum bending angle of the s-IPN hydrogels were influenced by the dosage of PVA and PEG.

Key words: hydrogel, semi-interpenetrating polymer network, stress strength, electrical sensitivity