Xue Zhichang, Wang Jihui, Diao Yaqi, Hu Wenbin
School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
Materials (Basel). 2024 Apr 22;17(8):1920. doi: 10.3390/ma17081920.
This paper focuses on the preparation and evaluation of a novel humidity-control material, vermiculite/(sodium polyacrylate(AA)-acrylamide(AM)), using inverse suspension polymerization. Acrylic acid and acrylamide were introduced into the interlayer of modified vermiculite during the polymerization process, leading to the formation of a strong association with the modified vermiculite. The addition of vermiculite increased the specific surface area and pore volume of the composites. To investigate the moisture absorption and desorption properties of the composites, an orthogonal experiment and single-factor experiment were conducted to analyze the impacts of vermiculite content, neutralization degree, and the mass ratio of AA to AM. According to the control experiment, the addition of vermiculite was found to enhance the pore structure and surface morphology of the composite material, surpassing both vermiculite and PAA-AM copolymer in terms of humidity control capacity and rate. The optimal preparation conditions were identified as follows: vermiculite mass fraction of 4 wt%, a neutralization degree of 90%, and m:m = 4:1. The moisture absorption rate and moisture release rate of the composite material prepared under these conditions are 1.285 g/g and 1.172 g/g. The humidity control process of the composite material is governed by pseudo second-order kinetics, which encompasses the complete adsorption process. These results indicate that the vermiculite/PAA-AM composite humidity control material has excellent humidity control performance and is a simple and efficient humidity control method.
本文重点研究了一种新型调湿材料蛭石/（聚丙烯酸钠（AA）-丙烯酰胺（AM））的制备及性能评价，采用反相悬浮聚合法。在聚合过程中，丙烯酸和丙烯酰胺被引入到改性蛭石的层间，与改性蛭石形成强缔合。蛭石的加入增加了复合材料的比表面积和孔体积。为了研究复合材料的吸湿和解吸性能，进行了正交试验和单因素试验，分析蛭石含量、中和度以及AA与AM的质量比对其的影响。根据对照实验，发现蛭石的加入增强了复合材料的孔结构和表面形貌，在调湿能力和速率方面均超过了蛭石和PAA-AM共聚物。确定了最佳制备条件如下：蛭石质量分数为4 wt%，中和度为90%，m:m = 4:1。在此条件下制备的复合材料的吸湿率和放湿率分别为1.285 g/g和1.172 g/g。复合材料的调湿过程受伪二级动力学控制，该动力学涵盖了整个吸附过程。这些结果表明，蛭石/PAA-AM复合调湿材料具有优异的调湿性能，是一种简单高效的调湿方法。
