Rational Fabrication of Anti‐Freezing, Non‐Drying Tough Organohydrogels by One‐Pot Solvent Displacement

作者：Fan Chen, Dan Zhou, Jiahui Wang, Tianzhen Li, Xiaohu Zhou, Xiaohu Zhou, Tiansheng Gan, Stephan Handschuh‐Wang, Xuechang Zhou, Xuechang Zhou · 发表于：Angewandte Chemie · 年份：2018 · DOI：10.1002/ange.201803366 · 被引用次数：138 · 研究领域：Hydrogels: synthesis, properties, applications、Advanced Sensor and Energy Harvesting Materials、Advanced Materials and Mechanics

Abstract Tough hydrogels, polymeric network structures with excellent mechanical properties (such as high stretchability and toughness), are emerging soft materials. Despite their remarkably mechanical features, tough hydrogels exhibit two flaws (freezing around the icing temperatures of water and drying under arid conditions). Inspired by cryoprotectants (CPAs) used in the inhibition of the icing of water in biological samples, a versatile and straightforward method is reported to fabricate extreme anti‐freezing, non‐drying CPA‐based organohydrogels with long‐term stability by partially displacing water molecules within the pre‐fabricated hydrogels. CPA‐based Ca‐alginate/polyacrylamide (PAAm) tough hydrogels were successfully fabricated with glycerol, glycol, and sorbitol. The CPA‐based organohydrogels remain unfrozen and mechanically flexible even up to −70 °C and are stable under ambient conditions or even vacuum.