Research Papers

Experimental and Theoretical Study on Mechanical Properties of Porous PDMS

[+] Author and Article Information
Chen Huang, Chengfeng Fang

College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, China

Zuguang Bian

Ningbo Institute of Technology,
Zhejiang University,
Ningbo 315100, China
e-mail: bzg@nit.zju.edu.cn

Xiaoliang Zhou

Institute of Solid Mechanics,
Beihang University (BUAA),
Beijing 100191, China

Jizhou Song

Soft Matter Research Center,
State Laboratory of Soft Machines and
Smart Devices of Zhejiang Province,
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou 310027, China

1Corresponding author.

Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received January 9, 2018; final manuscript received January 15, 2018; published online February 9, 2018. Editor: Yonggang Huang.

J. Appl. Mech 85(4), 041009 (Feb 09, 2018) (5 pages) Paper No: JAM-18-1017; doi: 10.1115/1.4039041 History: Received January 09, 2018; Revised January 15, 2018

Polydimethylsiloxane (PDMS) is extensively used in clinical flexible electronics, due to its biocompatibility and stability. When it is employed in a stretchable epidermal sensor for long-term monitoring, PDMS must have open pores within it to assure the sweat penetration. In the present paper, we focus on the mechanical properties of porous PDMS with different volume porosities at different temperatures. The emulsion polymerization technique is applied to fabricate porous PDMS. By controlling the ratio of water to PDMS prepolymer, different porosities of PDMS were obtained, and elastic moduli of such porous PDMS were measured in experiment. Results indicate that the elastic modulus increases nonlinearly as its temperature rises from 0 °C to 40 °C (a temperature range frequently encountered in clinical applications). Meanwhile, an asymptotic homogenization method (AHM) is employed to theoretically predict the elastic modulus and Poisson's ratio of porous PDMS, whose reliability is testified by comparing the results with experimentally measured data. Further theoretical discussions on mechanical properties are carried out, and results show that the pore size of porous PDMS has almost no effect on the elastic modulus and Poisson's ratio for certain porosities. Porosity of porous PDMS, however, has significant effect on both of these two mechanical parameters. Two fitted nonlinear formulas are then proposed to estimate the elastic modulus and Poisson's ratio of porous PDMS for any volume porosity less than 50%. All the results in the present paper are essential for mechanical design and optimization of clinical flexible electronics based on porous PDMS.

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Fig. 1

Photograph of test samples, upper: pure PDMS, lower: porous PDMS

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Fig. 2

Sketch of unit cells and two-scale coordinates in homogenization analysis

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Fig. 3

Sketches of periodic boundary restrictions: (a) normal deformation and (b) shear deformation

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Fig. 4

SEM images of a porous PDMS: (a) SEM image of air-side surface and (b) SEM image of cross section

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Fig. 5

Stress–strain curve of PDMS with different porosities at 20 °C

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Fig. 6

Elastic moduli and Poisson's ratios of porous PDMS with different pore sizes

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Fig. 7

Elastic moduli and Poisson's ratios of porous PDMS with different porosities




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