Directly Probing Polymer Thin Film Chemistry and Counterion Influence on Water Sorption,ACS Applied Polymer Materials

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Directly Probing Polymer Thin Film Chemistry and Counterion Influence on Water Sorption
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-09-02 , DOI: 10.1021/acsapm.0c00756
Pinar Aydogan Gokturk ₁ , Mikayla Barry ₂ , Rachel Segalman _{2,

3} , Ethan J. Crumlin _{1,

4}

Affiliation

Water interactions with polymers play an important role in nearly all aspects of life. Yet, precise understanding and quantification of such interactions at the molecular level is incomplete because many surface sensitive techniques lack the ability to operate under in situ conditions. To fill this gap, we applied tender ambient pressure X-ray photoelectron spectroscopy to study the effect of polymer functional groups, associated interaction types (polar vs ionic), and counterion types on water sorption. Experiments were carried out on model polymer systems of hydrophobic polystyrene, hydrophilic polyvinyl phenol, and charged polystyrene sulfonate thin films. Interaction of water vapor with these polymer surfaces was investigated in situ from ultra-high vacuum up to 100% relative humidity at room temperature. We showed directly at a molecular scale that water sorption is controlled by the polymer’s polar and charged groups. Additionally, counterion specific hydration mechanism on polyelectrolytes were revealed. Overall, these results provide mechanistic insights for the design of polymeric materials with improved properties.

中文翻译：

直接探测聚合物薄膜的化学性质及抗衡离子对吸水率的影响

水与聚合物的相互作用几乎在生活的各个方面都发挥着重要作用。然而，由于许多表面敏感技术缺乏在原位条件下运行的能力，因此在分子水平上对此类相互作用的精确理解和定量化尚不完全。为了填补这一空白，我们使用了环境压力X射线光电子能谱研究了聚合物官能团，相关相互作用类型（极性与离子）和抗衡离子类型对水吸附的影响。在疏水性聚苯乙烯，亲水性聚乙烯基苯酚和带电聚苯乙烯磺酸盐薄膜的模型聚合物系统上进行了实验。水蒸气与这些聚合物表面的相互作用被原位研究从超高真空到室温下的100％相对湿度。我们直接从分子尺度上证明了水的吸附是由聚合物的极性和带电基团控制的。此外，揭示了抗衡离子在聚电解质上的水合机理。总体而言，这些结果为具有改进性能的聚合物材料的设计提供了机械方面的见识。

更新日期：2020-09-02

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