PAM/CS/GO水凝胶的制备及其吸湿行为

吴银秋; 傅涛; 高洪鑫; 曹峥; 成骏峰; 刘春林; 陶国良; 吴盾

doi:10.14133/j.cnki.1008-9357.20201221001

PAM/CS/GO水凝胶的制备及其吸湿行为

doi: 10.14133/j.cnki.1008-9357.20201221001

吴银秋^1,,
傅涛¹,
高洪鑫¹,
曹峥^1,2, ,,
成骏峰¹,
刘春林^1,2,
陶国良¹,
吴盾¹

1.
常州大学材料科学与工程学院，材料科学与工程国家级实验教学示范中心，江苏常州 213164
2.
常州大学怀德学院，江苏靖江 214500

基金项目: 国家自然科学基金（21704008）；江苏省自然科学基金面上项目（BK20201449）；江苏省研究生实践创新项目（KYCX20_2532）

详细信息

作者简介:
吴银秋（1995—），女，福建福鼎人，硕士生，研究方向为功能高分子材料。E-mail：1030190474@qq.com

通讯作者:
曹　峥，E-mai：zcao@cczu.edu.cn

中图分类号: O63
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出版历程
- 收稿日期: 2020-12-21
- 网络出版日期: 2021-02-24

Preparation and Moisture Absorption Behavior of PAM/CS/GO Hydrogels

1.
National Experimental Demonstration Center for Materials Science and Engineering, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
2.
Changzhou University Huaide College, Jingjiang 214500, Jiangsu, China

摘要

摘要: 以丙烯酰胺（AM）为单体，壳聚糖（CS）与氧化石墨烯（GO）为功能组分，N, N'-亚甲基双丙烯酰胺（MBA）为交联剂，通过自由基聚合法制备PAM/CS/GO水凝胶。采用傅里叶变换红外（FT-IR）光谱、X射线粉末衍射（XRD）仪、扫描电镜（SEM）和万能试验机对水凝胶的结构与性能进行测试与表征。利用石英晶体微天平（QCM）研究该水凝胶薄膜在不同湿度条件下的吸湿行为。实验结果表明：相对于PAM/CS水凝胶，PAM/CS/GO水凝胶的力学性能得到显著提升，最大断裂伸长率为2 039%，最大断裂应力达到237 kPa；随着空气相对湿度从33%增加到85%，水凝胶薄膜修饰的QCM湿度传感器频率响应变化从12.2 Hz增大到22.3 Hz。
- 丙烯酰胺 /
- 壳聚糖 /
- 氧化石墨烯 /
- 石英晶体微天平 /
- 湿度传感器
Abstract: Using acrylamide (AM) as monomer, chitosan (CS) and graphene oxide (GO) as functional components, N, N'-methylene bisacrylamide (MBA) as crosslinking agent, a series of PAM/CS/GO composite hydrogels with three-dimensional network structure were prepared by free radical polymerization. The chemical composition, structure, morphology, and mechanical properties of the composite hydrogels were analyzed using Fourier transform infrared (FT-IR) spectroscopy, X-ray powder diffractometer (XRD), scanning electron microscope (SEM), and universal testing machine. The experimental results show that GO is uniformly dispersed in the PAM/CS hydrogel matrix. Compared with PAM/CS hydrogels, PAM/CS/GO hydrogels have a tighter porous structure with an average pore diameter of about 55.7 μm. In addition, the mechanical properties of PAM/CS/GO hydrogels have been significantly improved, the largest elongation at break is 2 039%, and the maximum breaking stress reaches 237 kPa. This is due to the fact that GO acts as a physical crosslinking agent in the PAM/CS hydrogel to form good interface bonds. The hydrogel with cross-linked network structure and plenty of hydrophilic groups can be used as the sensing coating of the quartz crystal microbalance (QCM), and the QCM humidity sensor based on the functional hydrogel film is prepared. The moisture absorption behavior of composite hydrogel films was studied using QCM technology under different humidity conditions. As the air relative humidity (RH) increases from 33% to 85%, the frequency response of the composite hydrogel film modified QCM sensor increases from 12.2 Hz to 22.3 Hz. This research work provides valuable reference for the application of the hydrogel coating in the field of QCM humidity sensors.
- acrylamide /
- chitosan /
- graphene oxide /
- quartz crystal microbalance /
- humidity sensor

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图 1 PAM/CS/GO水凝胶修饰的QCM传感器的制备以及吸湿过程

Figure 1. Preparation and moisture absorption process of PAM/CS/GO hydrogel modified QCM sensor

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图 2 样品的红外光谱图

Figure 2. FT-IR spectra of samples

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图 3 样品的X射线衍射谱图

Figure 3. XRD patterns of samples

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图 4 GO的（a）AFM与（b）TEM图

Figure 4. （a） AFM and （b） TEM images of GO

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图 5 水凝胶的（a，c）扫描电镜图及（b，d）孔径分布图

Figure 5. (a, c) SEM images and (b, d) pore size distribution of hydrogels

a, b—PAM/CS hydrogel; c. d—PAM/CS/GO-2.0% hydrogel

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图 6 水凝胶的应力-应变曲线

Figure 6. Stress-strain curves of hydrogels

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图 7 PAM/CS/GO水凝胶修饰的QCM传感器在33%RH条件下的（a）Δf与（b）ΔΓ曲线；QCM传感器在（c）不同相对湿度下Δf曲线以及（d）吸附平衡时的Δf（n=3）

Figure 7. (a) Δf and (b) ΔΓ curves of the PAM/CS/GO hydrogel modified QCM sensor at 33% RH; (c) Δf curves of the QCM sensor with different relative humidities and (d) Δf at adsorption balance

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