On the swelling behavior of poly(N‐Isopropylacrylamide) hydrogels exposed to perfluoroalkyl acids,Journal of Polymer Science

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On the swelling behavior of poly(N‐Isopropylacrylamide) hydrogels exposed to perfluoroalkyl acids
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2021-01-03 , DOI: 10.1002/pol.20200805
Dustin T Savage ₁ , Nicolas J Briot ₂ , J Zach Hilt ₁ , Thomas D Dziubla ₁

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Per‐ and polyfluoroalkyl substances (PFAS) have rapidly accumulated in the environment due to their widespread use prior to commercial discussion in the early 21st century, and their slow degradation has magnified concerns of their potential toxicity. Monitoring their distribution is, therefore, necessary to evaluate and control their impact on the health of exposed populations. This investigation evaluates the capability of a simple polymeric detection scheme for PFAS based on crosslinked, thermoresponsive poly(N‐isopropylacrylamide) (PNIPAM) hydrogels. Surveying swelling perturbations induced by several hydrotropes and comparable hydrocarbon analogs, tetraethylammonium perfluorooctane sulfonate (TPFOS) showed a significantly higher swelling ratio on a mass basis (65.5 ± 8.8 at 15°C) than any of the other analytes tested. Combining swelling with the fluorimetric response of a solvachromatic dye, nile red, revealed the fluorosurfactant to initiate observable aggregation (i.e., its critical aggregation concentration) at 0.05 mM and reach saturation (i.e., its charge neutralization concentration) at 0.5 mM. The fluorosurfactant was found to homogeneously distribute throughout the polymer matrix with energy dispersive X‐ray spectroscopy, marking the swelling response as a peculiar nexus of fluorinated interfacial positioning and delocalized electrostatic repulsion. Results from the current study hold promise for exploiting the physiochemical response of PNIPAM to assess TPFOS's concentration.

中文翻译：

聚（N-异丙基丙烯酰胺）水凝胶暴露于全氟烷基酸的溶胀行为

全氟烷基物质和多氟烷基物质 (PFAS) 在 21 世纪初商业讨论之前因其广泛使用而在环境中迅速积累，并且它们的缓慢降解加剧了人们对其潜在毒性的担忧。因此，有必要监测它们的分布，以评估和控制它们对暴露人群健康的影响。本研究评估了基于交联、热响应性聚（ N-异丙基丙烯酰胺）（PNIPAM）水凝胶的 PFAS 简单聚合物检测方案的能力。通过调查几种水溶助长剂和类似碳氢化合物类似物引起的溶胀扰动，全氟辛烷磺酸四乙铵 (TPFOS) 的溶胀比（15°C 时为 65.5 ± 8.8）显着高于任何其他测试分析物。将溶胀与溶剂变色染料尼罗红的荧光响应相结合，发现含氟表面活性剂在 0.05 mM 时引发可观察到的聚集（即其临界聚集浓度），并在 0.5 mM 时达到饱和（即其电荷中和浓度）。通过能量色散 X 射线光谱发现，含氟表面活性剂均匀分布在整个聚合物基质中，将溶胀响应标记为氟化界面定位和离域静电斥力的特殊联系。目前的研究结果有望利用 PNIPAM 的理化反应来评估 TPFOS 的浓度。

更新日期：2021-02-15

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