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Room Temperature Ca2+-Initiated Free Radical Polymerization for the Preparation of Conductive, Adhesive, Anti-freezing and UV-Blocking Hydrogels for Monitoring Human Movement
ACS Omega ( IF 3.7 ) Pub Date : 2023-03-03 , DOI: 10.1021/acsomega.2c08097 Hui Lv 1 , Shiyu Zong 1 , Tong Li 1 , Qian Zhao 1 , Zhiyong Xu 1 , Jiufang Duan 1
ACS Omega ( IF 3.7 ) Pub Date : 2023-03-03 , DOI: 10.1021/acsomega.2c08097 Hui Lv 1 , Shiyu Zong 1 , Tong Li 1 , Qian Zhao 1 , Zhiyong Xu 1 , Jiufang Duan 1
Affiliation
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In recent years, conductive hydrogels have received increasing attention as wearable electronics due to the electrochemical properties of conductive polymers combined with the softness of hydrogels. However, conventional hydrogels are complicated to prepare, require high temperature or UV radiation to trigger monomer polymerization, and are frozen at low temperatures, which seriously hinder the application of flexible wearable devices. In this paper, a conductive sensor integrating mechanical properties, adhesion, UV shielding, anti-dehydration, and anti-freeze was prepared based on Ca2+-initiated radical polymerization at room temperature using the synergy of sodium lignosulfonate, acrylamide (AM), and calcium chloride (CaCl2). Metal ions can activate ammonium persulfate to generate free radicals that allow rapid gelation of AM monomers at room temperature without external stimuli. Due to ionic cross-linking and non-covalent interaction, the hydrogels have good tensile properties (1153% elongation and 168 kPa tensile strength), high toughness (758 KJ·m–3), excellent adhesive properties (48.5 kPa), high ionic conductivity (7.2 mS·cm–1), and UV resistance (94.4%). CaCl2 can inhibit ice nucleation, so that the hydrogels have anti-dehydration and frost resistance properties and even at −80 °C can maintain flexibility, high conductivity, and adhesion. Assembled into a flexible sensor, it can sense various large and small movements such as compression, bending, and talking, which is a flexible sensing material with wide application prospects.
中文翻译：
室温 Ca2+ 引发的自由基聚合制备用于监测人体运动的导电、粘合剂、防冻和防紫外线水凝胶
近年来，由于导电聚合物的电化学性能与水凝胶的柔软性相结合，导电水凝胶作为可穿戴电子产品受到越来越多的关注。然而，传统的水凝胶制备复杂，需要高温或紫外辐射引发单体聚合，并且在低温下冻结，严重阻碍了柔性可穿戴设备的应用。本文利用木质素磺酸钠、丙烯酰胺( AM)、和氯化钙 (CaCl 2). 金属离子可以激活过硫酸铵产生自由基，使 AM 单体在室温下无需外部刺激即可快速凝胶化。由于离子交联和非共价相互作用，水凝胶具有良好的拉伸性能（1153% 伸长率和 168 kPa 拉伸强度）、高韧性（758 KJ·m –3 ）、优异的粘合性能（48.5 kPa）、高离子电导率 (7.2 mS·cm –1 ) 和抗紫外线 (94.4%)。氯化钙2可以抑制冰晶成核，使水凝胶具有抗脱水和抗冻性能，即使在-80℃下也能保持柔韧性、高导电性和粘附性。组装成柔性传感器，可感知压缩、弯曲、说话等各种大大小小的动作，是一种具有广泛应用前景的柔性传感材料。
更新日期：2023-03-03
中文翻译：
室温 Ca2+ 引发的自由基聚合制备用于监测人体运动的导电、粘合剂、防冻和防紫外线水凝胶
近年来，由于导电聚合物的电化学性能与水凝胶的柔软性相结合，导电水凝胶作为可穿戴电子产品受到越来越多的关注。然而，传统的水凝胶制备复杂，需要高温或紫外辐射引发单体聚合，并且在低温下冻结，严重阻碍了柔性可穿戴设备的应用。本文利用木质素磺酸钠、丙烯酰胺( AM)、和氯化钙 (CaCl 2). 金属离子可以激活过硫酸铵产生自由基，使 AM 单体在室温下无需外部刺激即可快速凝胶化。由于离子交联和非共价相互作用，水凝胶具有良好的拉伸性能（1153% 伸长率和 168 kPa 拉伸强度）、高韧性（758 KJ·m –3 ）、优异的粘合性能（48.5 kPa）、高离子电导率 (7.2 mS·cm –1 ) 和抗紫外线 (94.4%)。氯化钙2可以抑制冰晶成核，使水凝胶具有抗脱水和抗冻性能，即使在-80℃下也能保持柔韧性、高导电性和粘附性。组装成柔性传感器，可感知压缩、弯曲、说话等各种大大小小的动作，是一种具有广泛应用前景的柔性传感材料。
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