Institute for Energy Security and Environmental Safety, Centre for Energy Research, Hungarian Academy of Sciences, H-1525 Budapest 114, P.O. Box 49, Hungary; Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, H-1521 Budapest, P.O. Box 91, Hungary.
Faculty of Light Industry and Environmental Engineering, Obuda-University, 1034 Budapest, Doberdó út 6, Hungary.
Carbohydr Polym. 2017 Jun 15;166:300-308. doi: 10.1016/j.carbpol.2017.02.108. Epub 2017 Mar 1.
Hydroxyethylcellulose (HEC)/acrylic acid (AAc) copolymer gels with superabsorbent properties were synthesized from aqueous solutions by radiation-initiated crosslinking. The effect of the acrylic acid content on gel properties was determined at different synthesis conditions. The partial replacement of the cellulose derivative with acrylic acid improved the gelation, leading to higher gel fraction and lower water uptake even in very low concentrations (1-5%). In the presence of acrylic acid lower dose and solute concentration was required for the gel synthesis. The molecular properties of the hydroxyethylcellulose also had a major effect on the gelation: higher molecular mass resulted in better gel properties. The acrylic acid also affected the electrolyte sensitivity of the hydrogels: while pure HEC gels were unaffected by the ionic strength of the solvent, the water uptake of HEC/AAc gels decreased with the salt concentration. The sensitivity also depended on the acrylic acid ratio.
羟乙基纤维素（HEC）/丙烯酸（AAc）共聚物水凝胶具有高吸水性，通过辐射引发交联可从水溶液中合成。在不同的合成条件下，确定了丙烯酸含量对凝胶性能的影响。部分用丙烯酸取代纤维素衍生物可改善凝胶化作用，即使在非常低的浓度（1-5%）下，也能使凝胶分数更高，吸水率更低。在存在丙烯酸的情况下，凝胶合成所需的剂量和溶质浓度更低。羟乙基纤维素的分子性质对凝胶化也有很大影响：较高的分子量导致更好的凝胶性能。丙烯酸还影响水凝胶的电解质敏感性：虽然纯 HEC 凝胶不受溶剂离子强度的影响，但 HEC/AAc 凝胶的吸水率随盐浓度的增加而降低。敏感性也取决于丙烯酸的比例。
