Polyacrylamide hydrogels. I. Network imperfection

Yang, Canhui1,4; Yin, Tenghao1,2,3; Suo, Zhigang1

2019-10

10.1016/j.jmps.2019.06.018

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS   影响因子和分区

0022-5096

1873-4782

A real polymer network is never perfect, but the quantification of network imperfection has been elusive. Here we quantify the network imperfection of a polyacrylamide hydrogel through its mechanical properties. We find that the ultimate properties strength, extensibility, and work of fracture have narrow scatter, comparable to the scatter of modulus. Despite the narrow scatter, the work of fracture is about four orders of magnitude lower than that of the perfect network. This reduction in work of fracture is a measure of network imperfection. The toughness of the hydrogel is about two orders of magnitude higher than that of the perfect network. When the effects of other inelastic processes are minimized, this amplification in toughness is likely due to distributed chain scission, and is another measure of network imperfection. We find that the ultimate properties of the hydrogel are insensitive to cuts up to about 1 mm. We trace this cut insensitivity to network imperfection. (C) 2019 Elsevier Ltd. All rights reserved.

Hydrogel Polyacrylamide Rupture Network imperfection Fractocohesive length

SCI ; EI

英语

其他

NSF MRSEC[DMR-1420570]

Materials Science ; Mechanics ; Physics

Materials Science, Multidisciplinary ; Mechanics ; Physics, Condensed Matter

WOS:000482247400003

PERGAMON-ELSEVIER SCIENCE LTD

20192707138397

Fracture ; Polyacrylates

Chemical Products Generally:804 ; Organic Polymers:815.1.1 ; Materials Science:951

ENGINEERING

Web of Science

1.Harvard Univ, Kavli Inst Bionano Sci & Technol, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA
2.Zhejiang Univ, State Key Lab Fluid Power & Mechatron Syst, Key Lab Soft Machines & Smart Devices Zhejiang Pr, Ctr X Mech, Hangzhou 310027, Zhejiang, Peoples R China
3.Zhejiang Univ, Dept Engn Mech, Hangzhou 310027, Zhejiang, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China

Yang, Canhui,Yin, Tenghao,Suo, Zhigang. Polyacrylamide hydrogels. I. Network imperfection[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2019,131:43-55.

Yang, Canhui,Yin, Tenghao,&Suo, Zhigang.(2019).Polyacrylamide hydrogels. I. Network imperfection.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,131,43-55.

Yang, Canhui,et al."Polyacrylamide hydrogels. I. Network imperfection".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 131(2019):43-55.