A novel humidity sensor based on polymer-salt complexes was developed in this research. Poly(ethylene glycol) (PEG) segmented poly(ether ether ketone) copolymers (PEEK-co-PEG) has been successfully synthesized via condensation polymerization and the structure of this copolymer was confirmed by ¹ H NMR. Humidity sensors based on SPEEK/PEEK-co-PEG composites were prepared, and then humidity sensitive characteristics were systematically studied. Comparing with pure SPEEK, PEEK-co-PEG composites can significantly reduce the hysteresis effect of humidity sensors with the proportion of introduced PEG flexible segments increasing. Furthermore, different contents of LiCl were doped into polymer composites and their humidity sensing characteristics were also investigated. The humidity sensor based on SPEEK/PEEK-co-PEG/LiCl with [Li ⁺ ]:[O] ratio of 1:2 had excellent sensitivity, linearity, negligible hysteresis and quick response. Moreover, we proposed that the humidity sensing mechanism of sensors based on polymer-salt complexes is related to the combination of both directional motion of Li ⁺ on PEG backbone under low RH and ionization (SPEEK polyelectrolyte, Li ⁺ and Cl ⁻ ) under high RH. On the basis of these humidity sensing characteristics and mechanism, this work provides an approach to integrating polymeric and inorganic complexes as the promising materials for humidity sensors.

中文翻译：

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基于LiCl掺杂的SPEEK /聚（醚醚酮）-共聚（乙二醇）的新型聚合物-盐配合物用于湿度传感器

在这项研究中开发了一种基于聚合物-盐配合物的新型湿度传感器。通过缩聚成功地合成了聚乙二醇（PEG）嵌段聚醚醚酮（PEEK-co-PEG）共聚物，该共聚物的结构由¹证实。 1 H NMR。制备了基于SPEEK / PEEK-co-PEG复合材料的湿度传感器，然后对湿度敏感特性进行了系统的研究。与纯SPEEK相比，PEEK-co-PEG复合材料可显着降低湿度传感器的磁滞效应，同时增加引入的PEG柔性链段的比例。此外，将不同含量的LiCl掺杂到聚合物复合材料中，并对它们的湿度传感特性进行了研究。基于[EE ⁺ ]：[O]比为1：2的SPEEK / PEEK-co-PEG / LiCl的湿度传感器 具有出色的灵敏度，线性，滞后可以忽略并且响应速度快。此外，我们提出基于聚合物-盐配合物的传感器的湿度传感机制与Li ⁺的两个方向运动的组合有关。 对在低RH PEG骨架和电离（SPEEK聚电解质，李 ⁺和Cl ^- ）在高RH。基于这些湿度感测特性和机理，这项工作提供了一种将高分子和无机配合物整合为有希望的湿度传感器材料的方法。