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Research Papers

Dynamic Mechanical Analysis of Fly Ash Filled Polyurea Elastomer

[+] Author and Article Information
Jing Qiao1

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; Mechanical and Aerospace Engineering, Center of Excellence for Advanced Materials, University of California, San Diego, CA, 920903jingqiao.hit@gmail.com

Alireza V. Amirkhizi, Kristin Schaaf, Sia Nemat-Nasser

Mechanical and Aerospace Engineering, Center of Excellence for Advanced Materials, University of California, San Diego, CA, 920903

1

Corresponding author.

J. Eng. Mater. Technol 133(1), 011016 (Dec 03, 2010) (7 pages) doi:10.1115/1.4002650 History: Received March 09, 2010; Revised May 20, 2010; Published December 03, 2010; Online December 03, 2010

In this work, the material properties of a series of fly ash/polyurea composites were studied. Dynamic mechanical analysis was conducted to study the effect of the fly ash volume fraction on the composite’s mechanical properties, i.e., on the material’s frequency- and temperature-dependent storage and loss moduli. It was found that the storage and loss moduli of the composite both increase as the fly ash volume fraction is increased. The storage and loss moduli of the composites relative to those of pure polyurea initially increase significantly with temperature and then slightly decrease or stay flat, attaining peak values around the glass transition region. The glass transition temperature (measured as the temperature at the maximum value of the loss modulus) shifted toward higher temperatures as the fly ash volume fraction increased. Additionally, we present the storage and loss moduli master curves for these materials obtained through application of the time-temperature superposition on measurements taken at a series of temperatures.

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Figures

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Figure 1

SEM images of fly ash: (a) intact and (b) broken particles. Note the porous nature of the shell (the thickness of the shell is about 7 μm in image (b); usually, there is one layer of pores in the shell).

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Figure 2

The density of composites as a function of fly ash volume fraction

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Figure 3

SEM fractographs of 20% fly ash/polyurea composites

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Figure 4

Temperature dependence of log E′ for the matrix and the FA/PU composites (the error bars represent the standard deviation and the central points are the average values of three results)

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Figure 9

Normalized storage modulus of polyurea as a function of frequency in logarithmic scale

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Figure 5

Temperature dependence of log E″ for the matrix and the FA/PU composites (the error bars represent the standard deviation and the central points are the average values of three results)

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Figure 6

Temperature dependence of relative storage (top) and loss (bottom) moduli for FA/PU composites (Ec′, Em′, Ec″, and Em″ are the storage ( ′) and loss ( ″) moduli of the composites (c) and polyurea matrix (m))

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Figure 7

Master curves of storage modulus for polyurea and the FA/PU composites

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Figure 8

Master curves of loss modulus for polyurea and the FA/PU composites

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Figure 10

Temperature dependence of the shift factor log aTref used in plotting Figs.  78

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