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Ductile "Ice": frozen hydrogels with high ductility and compressive yielding strength

Rao, Ping and Li, Tiefeng and Wu, Zi liang and Hong, Wei and Yang, Xuxu and Yu, Honghui and Wong, Tuck-Whye and Qu, Shaoxing and Yang, Wei (2019) Ductile "Ice": frozen hydrogels with high ductility and compressive yielding strength. Extreme Mechanics Letters, 28 . pp. 43-49. ISSN 2352-4316

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Official URL: http://dx.doi.org/10.1016/j.eml.2019.02.008

Abstract

Ice, the solid state of water, which mainly consists of a hexagonal crystal structure in bulk, is usually very brittle. Although ice appears less brittle under compression or shear at a relatively low strain rate, it is by no means a ductile material as metal and is seldom considered as an engineering material in applications other than igloos. We report herein the astonishing ductility and high compressive yielding strength of a polymeric hydrogel in a frozen state. Containing 88 wt. % of water, the hydrogel appears like ice when frozen, and embraces most other physical properties of ice. Meanwhile, the frozen hydrogel not only shows a high compressive modulus (∼1 GPa at -25 °C) and yielding strength (∼20 MPa at -25 °C), but is also ductile enough to sustain extremely large deformation such as bending, twisting, stretching, extensive shaping, and even machining in a large low temperature range. The ductility at a high strain rate also makes it a material with a significant impact resistivity. Moreover, the frozen gel also exhibits the repeatable ductility - the large plastic deformation is completely recoverable at an elevated temperature. These results will be important towards developing low-cost and environment-friendly engineering materials used in a low temperature range when ductility and reusability is required.

Item Type:Article
Uncontrolled Keywords:ductile ice, frozen hydrogel, high yielding strength
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:89003
Deposited By: Yanti Mohd Shah
Deposited On:26 Jan 2021 16:38
Last Modified:26 Jan 2021 16:38

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