新型聚丙烯酸水凝胶的自愈及其溶胀动力学

doi:10.11901/1005.3093.2018.169

材料研究学报

2018, Vol. 32

Issue (8): 625-630 DOI: 10.11901/1005.3093.2018.169

研究论文

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新型聚丙烯酸水凝胶的自愈及其溶胀动力学

杨琴¹(

), 房春娟¹, 赵娜¹, 赵军凯¹, 王文东²

1 西安建筑科技大学理学院西安 710055
2 西安建筑科技大学环境与市政工程学院西安 710055

Self-healing and Swelling Kinetics of a New Polyacrylic Acid Hydrogels

Qin YANG¹(

), Chunjuan FANG¹, Na ZHAO¹, Junkai ZHAO¹, Wendong WANG²

1 School of Science , Xi'an University of Architecture and Technology, Xi'an 710055, China
2 School of Environment, Xi'an University of Architecture and Technology, Xi'an 710055, China

引用本文:

杨琴, 房春娟, 赵娜, 赵军凯, 王文东. 新型聚丙烯酸水凝胶的自愈及其溶胀动力学[J]. 材料研究学报, 2018, 32(8): 625-630.
Qin YANG, Chunjuan FANG, Na ZHAO, Junkai ZHAO, Wendong WANG. Self-healing and Swelling Kinetics of a New Polyacrylic Acid Hydrogels[J]. Chinese Journal of Materials Research, 2018, 32(8): 625-630.

全文: PDF(1284 KB) HTML

摘要:

以丙烯酸(AA)、水、七元瓜环(CB[7])和过硫酸钾(KPS)、NaCl为原料制备七元瓜环/聚丙烯酸水凝胶(CB[7]/PAA hydrogel),宏观观察了CB[7]/PAA hydrogel的自愈性,研究了这种自愈水凝胶的网络形成作用力。结果表明：这种水凝胶网络的形成作用力主要是多重氢键,具有自愈性,自愈后的最大拉伸量约为原长的1.73倍;AA含量较低时随着AA含量的提高溶胀率和溶胀速率增大,AA含量较高时随着AA含量的提高溶胀率和溶胀速率减小;这种水凝胶的溶胀率与溶胀速率,在pH值为7. 6的水溶液中的值明显高于在pH值为10.0和4.0水溶液中的值。使用Non-Fickian扩散模型研究了CB[7]/PAA hydrogel的溶胀机理。CB[7]/PAA hydrogel的动力学指数n、凝胶速率常数K和水分子扩散系数D的值表明,这种水凝胶的溶胀符合Non-Fickian扩散模式,在溶胀初期水分子的扩散速率与凝胶中的链段松弛速率相当。

关键词 ：功能高分子材料, 自愈, 氢键, 溶胀动力学

Abstract：

A self-healing CB[7]/PAA hydrogel was prepared with acrylic acid (AA), H₂O, cucurbituril[7] (CB[7]), potassium persulfate (KPS) and NaCl as raw materials. The self-healing process of CB [7]/PAA hydrogel was investigated by means of FT-IR and ¹H NMR techniques. Results show that the hydrogel networks formed during the self-healing of CB [7]/PAA hydrogel are mainly induced by the existence of multiple hydrogen bonds, and after the self-healing, the maximum tensile elongation of CB[7]/PAA hydrogel can reach about 1.73 times of that of the as prepared ones. Within a range of low AA content, the swelling and swelling rate of the hydrogel increase with the increasing AA content, while in a range of high AA content, the swelling and the swelling rate decreases with the increasing AA content; the swelling and swelling rate of the hydrogel in the aqueous solution of pH=7.6 were obviously higher than those in the aqueous solution of pH=10.0 and pH=4.0. The kinetic index n, rate constant K and water diffusion coefficient D of CB[7]/PAA hydrogel were acquired corresponding to non-Fickian diffusion mode. It follows that the swelling of CB [7]/PAA hydrogel is in accordance with the non-Fickian diffusion mode, and the diffusion rate of water molecules is comparable to that of the relaxation rate of chain segments in the hydrogel.

Key words： functional polymer materials self-healing hydrogen bond swelling dynamics

收稿日期: 2018-02-24

ZTFLH:

O632.51

基金资助:资助项目陕西省教育厅专项科研计划(17JK0432),陕西省重大科技成果转化引导专项(2016KTCG01-17)

作者简介:

作者简介杨琴,女,1974年生,博士,副教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.169 或 https://www.cjmr.org/CN/Y2018/V32/I8/625

图1 PAA hydrogel和CB[7]/PAA hydrogel的红外光谱图

图2 CB[7]/PAA hydrogel的1H NMR谱图

图3 CB[7]/PAA hydrogel的自愈示意图

图4 不同AA含量的CB[7]/PAA hydrogel样品在pH=7.6的溶胀动力学曲线

图5 不同AA含量的CB[7]/PAA hydrogel的溶胀速率随时间的变化

图6 CB[7]/PAA hydrogel样品在不同pH值条件下的溶胀动力学曲线

图7 CB[7]/PAA hydrogel(AA=1.2 mL)的溶胀速率随时间的变化

表1 CB[7]/PAA hydrogel在不同条件下的动力学指数、凝胶速率常数和水分子扩散系数

图8 CB[7]/PAA hydrogel的自愈机理示意图

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