Molecular Design of Superabsorbent Polymers for Organic Solvents by Crosslinked Lipophilic Polyelectrolytes
Molecular Design of Superabsorbent Polymers for Organic Solvents by Crosslinked Lipophilic Polyelectrolytes
复制标题
DOI：
10.1002/adfm.200801221
复制
发表时间：
2008-12-22
影响因子：
19
通讯作者：
Sada, Kazuki
中科院分区：
文献类型：
--
作者：
Ono, Toshikazu;Sugimoto, Takahiro;Sada, Kazuki
亲脂性聚电解质凝胶作为高吸水性聚合物，在低极性和非极性有机溶剂中表现出高度的溶胀。将少量具有长烷基链的四苯基硼酸四烷基铵作为脂醇离子对掺入具有可变烷基链长的交联聚丙烯酸酯中，制备出新型亲脂性聚电解质凝胶。在各种有机溶剂中，它们的膨胀程度是其干燥重量的100倍以上。随着烷基链长度的减小，可溶胀溶剂的高效性向极性溶剂转移。亲脂性聚电解质凝胶的膨胀或坍缩源于介质中聚合物链的不相容性和离子基团的解离。因此，当聚合物链与溶剂具有良好的相容性并且溶剂具有足够高的极性以解离离子基团时，可以观察到独特的高吸水性。通过改变这些聚电解质凝胶中中性单体的极性，可以证明凝胶的设计可以吸收几乎任何极性的溶剂。
Molecular design of lipophilic polyelectrolyte gels as superabsorbent polymers that exhibit a high degree of swelling in less-polar and nonpolar organic solvents is demonstrated. A small amount of tetraalkylammonium tetraphenylborate with long alkyl chains as a lipopholic ion pair is incorporated into crosslinked polyacrylates with variable alkyl chain lengths to provide novel lipophilic polyelectrolyte gels. Their swelling degree becomes more than 100 times as much as their dried weights in various organic solvents. The high effectiveness of the swellable solvents shifts to the polar ones by decreasing the length of the alkyl chain. Swelling or collapsing of the lipophilic polyelectrolyte gels originates from both incompatibility of the polymer chains in the media and dissociation of ionic groups. Thus, a unique superabsorbency is observed when the polymer chains have good compatibility with the solvents and the solvents have relatively high polarities enough to dissociate the ionic groups. By varying the polarity of the neutral monomer in these polyelectrolyte gels, the design of gels that can absorb solvents of nearly any polarity is demonstrated.