Water Diffusion in Polymer Composites Probed by Impedance Spectroscopy and Time-Resolved Chemical Imaging,ACS Applied Polymer Materials

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Water Diffusion in Polymer Composites Probed by Impedance Spectroscopy and Time-Resolved Chemical Imaging
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-01-07 , DOI: 10.1021/acsapm.9b01107
Daniel Hansen _{1,

2} , Jonathan R. Brewer ₃ , Johannes Eiler _{1,

2} , Niloufarsadat Mirmahdi Komjani _{1,

4} , Kristoffer Hansen ₂ , Esben Thormann ₁

Affiliation

The ability to probe water diffusion in polymer composites is of significant importance for materials characterization and performance evaluation. Here, we investigate water diffusion in polymer composites using coherent anti-Stokes Raman scattering microscopy and impedance spectroscopy. Coherent anti-Stokes Raman scattering microscopy provides real-time information about evolution in the polymer composite structure during water uptake, which supports a method for evaluation of impedance data obtained in a water penetration process. The method extracts the water diffusion kinetics from the relative change in the temporal capacitance, which includes contributions from changing dielectric properties and thickness. Specifically, the method is used for investigating two model composites relevant for medical adhesives consisting of a hydrophobic and rigid polymer matrix mixed with either poly(acrylic acid) or cetyl hydroxyethyl cellulose particles. Based on our analysis, these two composites exhibit anomalous diffusion and case II sorption, respectively, corresponding to faster relaxation processes in the poly(acrylic acid) containing composites compared to the cetyl hydroxyethyl cellulose containing composites during the water uptake process. Furthermore, the cetyl hydroxyethyl cellulose containing composites demonstrate characteristic penetration and saturation times almost an order of magnitude higher than the poly(acrylic acid) containing composites. In agreement with known chemical properties of these materials, this implies a lower water affinity for cetyl hydroxyethyl cellulose compared to poly(acrylic acid).

中文翻译：

阻抗谱和时间分辨化学成像探测聚合物复合材料中的水扩散

探测聚合物复合物中水扩散的能力对于材料表征和性能评估非常重要。在这里，我们使用相干抗斯托克斯拉曼散射显微镜和阻抗谱研究聚合物复合物中的水扩散。相干抗斯托克斯拉曼散射显微镜可提供有关吸水过程中聚合物复合结构演变的实时信息，这支持了一种评估在渗水过程中获得的阻抗数据的方法。该方法从时间电容的相对变化中提取水扩散动力学，该变化包括电介质性质和厚度的变化。具体来说，该方法用于研究与医用粘合剂有关的两种模型复合材料，该模型复合材料由疏水性和刚性聚合物基体与聚（丙烯酸）或十六烷基羟乙基纤维素颗粒混合而成。根据我们的分析，这两种复合材料分别表现出异常扩散和吸附情况II，这与吸水过程中含十六烷基羟乙基纤维素的复合材料相比，含聚丙烯酸的复合材料中的松弛过程更快。此外，含十六烷基羟乙基纤维素的复合材料的特征渗透和饱和时间比含聚丙烯酸的复合材料高近一个数量级。与这些材料的已知化学性质相符，

更新日期：2020-01-07

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