β-环糊精-丙烯酸-丙烯酰胺接枝共聚型树脂在金属离子中的吸液行为研究

Swelling behaviors of β-cyclodextrin-acrylic acid-acrylamide in different metal ions

以β-环糊精、丙烯酸与丙烯酰胺为原料,采用反相悬浮接枝聚合法制备了β-环糊精基高吸水性树脂,系统研究了树脂在不同种金属离子中的吸液特征。实验结果表明金属离子和水之间存在着竟吸作用,3种金属阳离子对树脂的吸液效果影响大小分别是NaCl>CaCl2>FeCl3,树脂在CaCl2和FeCl3溶液中的吸液行为有过溶胀现象,且过溶胀现象随金属离子强度的升高而减弱。树脂在溶液浓度为0.005～0.1mol/L的不同阴离子溶液中的吸液倍率大小顺序为NaAc>Na2CO3>Na3PO4,阴离子离子半径越大,水合作用越强,吸液倍率越低。树脂在金属离子中吸液后的凝胶仍保持较好的三维网格结构,且网格大小与吸液倍率成正相关。

The superabsorbent resin was synthesized by inverse suspension polymerization using β-cyclodextrin（β-CD）,acrylic（AA） and acrylamide（AM） as materials.The swelling characteristics of resin was researched in different metal ions.The result s show that ： the effect of competition swelling between metal ions and water to the resin is obviously,the effect of the swelling capability on the resin is NaClCaCl2FeCl3.The swelling behavior of the resin has overshoot phenomenon in CaCl2 and FeCl3,and the overshooting phenomenon to resin decrease with the increase of metal ionic intensity.When the anion solution concentration are 0.005-0.1mol/L,the swelling capability of the resin is NaAcNa2CO3Na3PO4.Anonic radius is bigger,hydration is stronger,the swelling capality of the resin is lower.The micro-morphology of resin in metal ion solution is classical 3-dimensional network structure,and the size of the network but all membranes in 3-dimensional gridding membrane structure.There was positive correlation between the size of the network and the absorptive capability.