Comb Architecture to Control the Selective Diffusivity of a Double Network Hydrogel,ACS Applied Polymer Materials

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Comb Architecture to Control the Selective Diffusivity of a Double Network Hydrogel
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-09-16 , DOI: 10.1021/acsapm.0c00987
Ping Dong ₁ , Bradley J. Schott ₁ , A. Kristen Means ₂ , Melissa A. Grunlan _{1,

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Affiliation

Limiting the diffusion of small-sized substances (D_h < 5 nm) through hydrogels is particularly difficult to achieve. Herein, we demonstrate the utility of a comb architecture to systematically reduce the mesh size of a double network (DN) hydrogel to between ∼1 and 3 nm, without loss of hydration. Combs of varying charge, length, and concentration were introduced during the formation of the first network of the DN hydrogel based on thermoresponsive N-isopropylacrylamide and negatively charged 2-acrylamido-2-methylpropane sulfonic acid. The resulting hydrogels’ mesh sizes were characterized with a size-exclusion test. Negatively charged combs were the most effective in reducing mesh size, attributed to electrostatic repulsive forces with the DN. Due to a lack of interaction and attractive forces to the first network, respectively, neutral and particularly positively charged combs were less effective.

中文翻译：

梳状结构，以控制双网络水凝胶的选择性扩散率。

限制小尺寸物质（D _h <5 nm）通过水凝胶的扩散特别难以实现。本文中，我们展示了梳状结构的实用性，可将双网（DN）水凝胶的网眼尺寸系统地减小到1-3 nm，而不会失去水合作用。在基于热敏N的DN水凝胶的第一个网络的形成过程中，引入了电荷，长度和浓度变化的梳子-异丙基丙烯酰胺和带负电荷的2-丙烯酰胺基-2-甲基丙烷磺酸。用尺寸排阻测试表征所得水凝胶的筛孔尺寸。带负电的梳子在减小网孔尺寸方面最有效，这归因于DN产生的静电排斥力。由于分别缺乏对第一网络的相互作用和吸引力，因此中性和特别是带正电的梳子效果较差。

更新日期：2020-11-13

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