Sungoradee Thichakorn, Srikulkit Kawee
Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
Polymers (Basel). 2022 Apr 21;14(9):1699. doi: 10.3390/polym14091699.
Polyelectrolyte complex (PEC) hydrogel, formed via physically electrostatic crosslinks between polyanion and polycation, is an interesting hydrogel in terms of its nontoxicity and solvent-free technique. In this work, poly (sodium 4-styrenesulfonate) (PSS)/poly (diallyl dimethyl ammonium chloride) (PDADMAC) complex hydrogels were prepared. Firstly, the PSS/PDADMAC complex aggregates using various PSS/PDADMAC mole fractions that were prepared in the presence of NaCl solution. Then, the aggregates were resolubilized under stirring at 70 °C for 2 h to obtain a homogeneous PEC solution. Finally, the PEC solution was dialyzed using a dialysis membrane with 3500 molecular cut-off for 1 day. The dialysis bath was changed every interval period of 2 h to control the rate of reversible electrostatic interaction, resulting in the homogenous PEC hydrogel with porous morphology as revealed by SEM and BET investigations. The dimensional stability and viscoelasticity of the PEC hydrogel was studied by DMA experiment, which showed the viscoelastic behavior at a compressive force ranging from 0 to 0.1 N. Finally, PSS/PDADMAC hydrogels showed a high water absorbency property and excellent affinity to textile anionic dyes.
聚电解质复合物（PEC）水凝胶是通过聚阴离子和聚阳离子之间的物理静电交联形成的，就其无毒和无溶剂技术而言，是一种有趣的水凝胶。在这项工作中，制备了聚（4-苯乙烯磺酸钠）（PSS）/聚（二烯丙基二甲基氯化铵）（PDADMAC）复合水凝胶。首先，在NaCl溶液存在下制备具有各种PSS/PDADMAC摩尔分数的PSS/PDADMAC复合聚集体。然后，将聚集体在70℃搅拌下再溶解2小时以获得均匀的PEC溶液。最后，使用截留分子量为3500的透析膜对PEC溶液进行透析1天。每隔2小时更换一次透析液以控制可逆静电相互作用的速率，从而得到如扫描电子显微镜（SEM）和比表面积分析仪（BET）研究所揭示的具有多孔形态的均匀PEC水凝胶。通过动态热机械分析（DMA）实验研究了PEC水凝胶的尺寸稳定性和粘弹性，结果表明在0至0.1N的压缩力下呈现粘弹性行为。最后，PSS/PDADMAC水凝胶表现出高吸水性和对纺织阴离子染料的优异亲和力。
