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    吴银秋, 傅涛, 高洪鑫, 曹峥, 成骏峰, 刘春林, 陶国良, 吴盾. PAM/CS/GO水凝胶的制备及其吸湿行为[J]. 功能高分子学报, 2021, 34(4): 394-400. doi: 10.14133/j.cnki.1008-9357.20201221001
    引用本文: 吴银秋, 傅涛, 高洪鑫, 曹峥, 成骏峰, 刘春林, 陶国良, 吴盾. PAM/CS/GO水凝胶的制备及其吸湿行为[J]. 功能高分子学报, 2021, 34(4): 394-400. doi: 10.14133/j.cnki.1008-9357.20201221001
    WU Yinqiu, FU Tao, GAO Hongxin, CAO Zheng, CHENG Junfeng, LIU Chunlin, TAO Guoliang, WU Dun. Preparation and Moisture Absorption Behavior of PAM/CS/GO Hydrogels[J]. Journal of Functional Polymers, 2021, 34(4): 394-400. doi: 10.14133/j.cnki.1008-9357.20201221001
    Citation: WU Yinqiu, FU Tao, GAO Hongxin, CAO Zheng, CHENG Junfeng, LIU Chunlin, TAO Guoliang, WU Dun. Preparation and Moisture Absorption Behavior of PAM/CS/GO Hydrogels[J]. Journal of Functional Polymers, 2021, 34(4): 394-400. doi: 10.14133/j.cnki.1008-9357.20201221001

    PAM/CS/GO水凝胶的制备及其吸湿行为

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

    • 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。

       

      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 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.

       

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