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Characterization and parameter optimization of a microcellular polypropylene electret under an external inertial load

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Abstract

In this study, microcellular polypropylene (PP) electrets were fabricated under various charge and process conditions. This was followed by thermally stimulated current (TSC) experiments to examine in a qualitative manner the charge stability of the electrets and the origin of the surface and space charges. In addition, a series of experiments was performed to obtain the effective piezoelectric constant in the thickness direction using an equation that considers external inertial loading effects. An optimization process using the Taguchi method was conducted to find the optimal conditions for the charging process and the electret properties that maximize the piezoelectric effects. To compare the contributions of signal parameters, a pooled analysis of variance (pooled ANOVA) was used. From these results, the factors that most significantly influence the piezoelectric effects were identified. A response surface was constructed to predict the optimal values of these factors to obtain the best piezoelectric effects. As a consequence, the applied voltage and the modified film thickness were turned out to be the most influential factors, and it was predicted that the optimal conditions are a 30-kV corona discharge and use of 60-µm-thick film.

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Abbreviations

x i :

coordinate axis in the i th direction; i th input variable

ϕ :

electric potential

d33*:

effective piezoelectric constant of film in x 3 direction

Q :

total amount of charge

h :

film thickness

u 3 (h) :

displacement of the film’s top surface in x 3 direction

A :

surface area of film

m :

mass of loading mass

g :

gravitational acceleration constant

τ3 (h) :

applied stress at the film’s top surface in x 3 direction

s 33 E* :

effective compliance of film in x 3 direction

s ij E :

tensor components of compliance

βi(j)(i, j=1,...,k):

regression coefficients

y ij :

ith response at the jth trial

n i :

replications for the i th response

ξ i :

ith independent variable

ξ 0i :

averages of the measured values of ξ i

c i :

constants to normalize ξ i

y :

output variable

ŷ :

estimated output function

S/N ratio i :

signal to noise ratio of the i th response

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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Chung-Ang University, Seoul, South Korea, 156-756

    Youngsik Kim, Pilkee Kim & Juhong Lee

  2. School of Mechanical Engineering, Chung-Ang University, Seoul, South Korea, 156-756

    Jongwon Seok

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  1. Youngsik Kim
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  2. Pilkee Kim
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Correspondence to Jongwon Seok.

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Kim, Y., Kim, P., Lee, J. et al. Characterization and parameter optimization of a microcellular polypropylene electret under an external inertial load. Int. J. Precis. Eng. Manuf. 10, 97–106 (2009). https://doi.org/10.1007/s12541-009-0100-6

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