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3. Results and discussion 3.1. Effects of synthesis conditions on the water absorption properties of the resin Fig. 1(a) shows that the increase in the mass ratio of AA:AM caused an increase in the swelling capacity of the resin. When the mass ratio of AA:AM was 7:1, the swelling capacity was relatively high and the gel strength was good. The increase in the concentration of acrylic acid favors the movement of ion groups into the resin. The osmotic pressure inside the resin increases accordingly and facilitates the penetration of water molecules into the interior of the resin upon contact with water. Moreover, the repulsion of the ion groups that were relocated inside the resin toward one another promotes swelling. Further increase of the AA content resulted in the increase in ionic group content inside the resin. However, the water absorbance was less because the absorption properties of the resin did not solely rely on osmotic pressure as a consequence of the ionic groups, but also due to the synergistic interaction between the various groups in the resin. |
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haizhoubuer: 金币+20, 翻译EPI+1, ★★★★★最佳答案, 太棒啦 2014-11-04 13:04:16
haizhoubuer: 金币+20, 翻译EPI+1, ★★★★★最佳答案, 太棒啦 2014-11-04 13:04:16
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3. 结果与讨论 3.1. 合成条件对树脂吸水性能的影响 图1（a）显示，AA：AM质量比的增加可以引起树脂的溶胀能力的增加。当AA：AM的质量比为7：1时，溶胀力相对较高，且凝胶强度良好。丙烯酸浓度的增加有利于离子基团的运动进入树脂。树脂内渗透压相应增加并促进水分子渗透到树脂内部。此外，树脂内互相排斥的离子基团被相向移位，从而促进溶胀。AA含量的进一步增加引起树脂内离子基团的含量的增加。然而吸水性变小，因为树脂的吸附特性并不仅仅依赖由离子性基团产生的渗透压，而且还由于在树脂中的哥基团之间的协同相互作用。 |
2楼2014-11-04 10:54:07