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Instant Thermal Switching from Soft Hydrogel to Rigid Plastics Inspired by Thermophile Proteins

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Title: Instant Thermal Switching from Soft Hydrogel to Rigid Plastics Inspired by Thermophile Proteins
Authors: Nonoyama, Takayuki Browse this author →KAKEN DB
Lee, Yong Woo Browse this author
Ota, Kumi Browse this author
Fujioka, Keigo Browse this author
Hong, Wei Browse this author
Gong, Jian Ping Browse this author →KAKEN DB
Keywords: friction-heat protection
gel-plastic switching
super modulus jumping
thermal stiffening
thermoinduced rubbery-to-glassy transition
Issue Date: 28-Jan-2020
Publisher: Wiley
Journal Title: Advanced Materials
Volume: 32
Issue: 4
Start Page: 1905878
Publisher DOI: 10.1002/adma.201905878
PMID: 31736142
Abstract: Proteins of thermophiles are thermally stable in a high-temperature environment, adopting a strategy of enhancing the electrostatic interaction in hydrophobic media at high temperature. Herein, inspired by the molecular mechanism of thermally stable proteins, the synthesis of novel polymer materials that undergo ultrarapid, isochoric, and reversible switching from soft hydrogels to rigid plastics at elevated temperature is reported. The materials are developed from versatile, inexpensive, and nontoxic poly(acrylic acid) hydrogels containing calcium acetate. By the cooperative effects of hydrophobic interaction and ionic interaction, the hydrogels undergo significant spinodal decomposition and subsequent rubbery-to-glassy transition when heated to an elevated temperature. As a result, the gels exhibit super-rapid and significant hikes in stiffness, strength, and toughness by up to 1800-, 80-, and 20-folds, respectively, when the temperature is raised from 25 to 70 degrees C, while the volumes of the gels are almost unchanged. As a potential application, the performance of the materials as athletic protective gear is demonstrated. This work provides a pathway for developing thermally stiffened materials and may significantly broaden the scope of polymer applications.
Type: article
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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