Reversible crosslinking and decrosslinking of polymers containing alcohol moiety using an acyclic bifunctional vicinal triketone
Reversible crosslinking and decrosslinking of polymers containing alcohol moiety using an acyclic bifunctional vicinal triketone
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使用无环双官能邻位三酮对含有醇部分的聚合物进行可逆交联和解交联
DOI：
10.1002/pola.27087
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Takeshi Endo et al.
中科院分区：
文献类型：
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作者：
Takeshi Endo et al.
在这篇文章中，我们报告了可逆的交联和去交联系统的市售醇类聚合物，使用双官能邻位三酮（bistriketone）作为交联剂。将少量的双三酮（相对于聚合物的OH基团的0.2当量的三羰基部分）加入到聚（甲基丙烯酸2-羟乙酯）（PHEMA）在二甲基亚砜（DMSO）中的溶液中。4天后，以97%的产率获得黄色凝胶形式的网状聚合物。相反，所得凝胶可以通过用MeOH处理4天来解交联，以94%的产率回收原始PHEMA以及以54%的产率回收双三酮。通过1H NMR和尺寸排阻色谱实验详细研究了网络的形成和解离行为。与PHEMA类似，通过加入双三酮和用H2O/DMSO（1/9，v/v）处理所得凝胶，分别实现了聚（乙烯醇）的可逆交联和解交联。© 2014 Wiley Periodicals，Inc. J.波利姆科学，A部分：聚合物Chem.2014，52，921-928
In this article, we report reversible crosslinking and decrosslinking systems of commercially available alcoholic polymers, using a bifunctional vicinal triketone (bistriketone) as a crosslinking reagent. A small amount of the bistriketone (0.2 equiv of the tricarbonyl moiety relative to the OH group of the polymer) was added to a solution of poly(2‐hydroxyethyl methacrylate) (PHEMA) in dimethyl sulfoxide (DMSO). After 4 days, the networked polymer was obtained as a yellow‐colored gel in 97% yield. Conversely, the resulting gel could be decrosslinked by treatment with MeOH for 4 days to recover the original PHEMA in 94% yield as well as the bistriketone in 54% yield. The network formation and dissociation behaviors were investigated in detail by1H NMR and size exclusion chromatography experiments. Similarly to PHEMA, reversible crosslinking and decrosslinking of poly(vinyl alcohol) were achieved by addition of the bistriketone and by treatment of the resulting gel with H2O/DMSO (1/9, v/v), respectively. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2014,52, 921–928