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Fig. 1(f) shows the effect of _-CD use on resin absorbency. The primary role of _-CD is to provide a skeleton of cross-linked network. In addition, _-CD also contributes to the promotion of polymerization (Peng et al., 2008). _-CD dosage is 10–30% of the monomer weight. Fig. 1(f) further reveals that water absorbency initially increased and then decreased with increasing _-CD dosages. When the mass ratio of _-CD to the monomers was 2:6, the best swelling performance of the resin was observed. The water absorbency in distilled water was 1382.11 g/g and that in 0.9 wt.% NaCl was 129.54 g/g. If the dosage of _-CD was too low, the AA and AM concentrations would have been relatively too much and the cross-linking degree would have been too high, which result in a low water absorbency of resin. |
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haizhoubuer: 金币+5, 翻译EPI+1, ★★★★★最佳答案, 太棒了! 2014-10-21 22:44:45
haizhoubuer(RXMCDM代发): 金币+10 2014-10-23 23:06:37
haizhoubuer: 金币+5, 翻译EPI+1, ★★★★★最佳答案, 太棒了! 2014-10-21 22:44:45
haizhoubuer(RXMCDM代发): 金币+10 2014-10-23 23:06:37
| 图1(f)显示了β-CD对树脂吸水性的影响。 β-CD的主要作用是提供交联网络的骨架。此外,β-CD还有助于促进聚合(Peng等人,2008)。 β-CD的用量为单体重量的10-30%。图 1(f)进一步显示,随着β-CD的剂量的增加,吸水性先上升然后降低。当β-CD与单体的质量比为2:6时,树脂的溶胀性能最佳。在蒸馏水中的吸水率是1382.11克/克,而在0.9%NaCl(重量百分比)中为129.54克/克。如果β-CD的剂量太低,AA和AM浓度会相对过多,交联度将会过高,导致树脂的低吸水性。 |
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