**[Responses to Reviewer's comments]{.underline}**

The reviewer's comments were very helpful and we thanks for their time
to review this paper.

According to reviewer's recommendations, some expressions are corrected
clearly and additional information is included for easiness of
understanding.

**Comments and Responses**

1.  • **Section 1**: σ*~r~* should be changed with ε~*r*.~

    0.  \* The symbol for dielectric constant is corrected
        to![](media/image1.wmf).

    • **Section 2, Eq. (1):** C should be defined as the capacitance
    *per unit volume*.

\* The definition of C is corrected and the equation is described
clearly.

4.  • **Section 2, Eq. (2):** a square symbol is missing in the third
    group (after the second equal sign).

    0.  \* There was an editing error in LaTeX equation description.

        \* The equation is corrected.

    • **Section 4.2, third and fourth sentences:** "*\... Fig. 4\...
    tensile strength \.... Those of VHB, KE441 and CF19-2186 are listed
    as 3MPa, 0.25MPa, 0.24MPa, and 0.5MPa, respectively\...".*
    Observations:

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1.  i\) According to Fig. 4, the numbers reported in the text seem to be
    not consistent with the tensile strengths of the materials (the
    stress at which fracture occurs in tension), as they can be deduced
    from the curves. Therefore, a correction of the numbers or of the
    considered variable appears to be necessary.

> \* There were mistakes. The values are elastic modulus. So the phrase
> "tensile strength" is corrected to "elastic modulus".

2.  ii\) The fourth sentence lists 3 materials but 4 numbers. Please,
    add the fourth material (synthetic elastomer).

> \* Three materials are listed, VHB4905, KE441 and synthetic elastomer.
>
> \* The CF19-2186 is deleted to be consistent with other results.

1.  • **Section 5.1, fourth line:** "*exists*" should be changed with
    "*exist*".

> \* That is corrected.

2.  • **Fig. 8:** suggestion: the line corresponding to VHB is hardly
    visible when printed. It is suggested to sharpen it.

> \* The figure is revised.

3.  • **Section 5.3, second paragraph:** according to Fig. 9, even VHB
    seems to have ascending and descending curves with different
    curvature.

> \* The sentence was unclear. The sentence is revised clearly.

4.  • **Section 5.4 and Table 1:** it could be useful to specify for the
    reader that the reported values of stress have been calculated and
    not measured.

> \* The Maxwell stresses were obtained by calculation with the electric
> field and dielectric constant during experiments. That is mentioned in
> the first paragraph of section 5.4.

5.  • **Table 1:** It could be useful to specify that the listed values
    of elastic energy have been obtained by using the following
    calculation: 0.5\*Y\*δ^2^. In fact, by using different expressions
    theoretically equivalent (such as the last term of Eq. (2) or
    0.5\*stress\*strain) opposite trends would result.

> \* Actually, the Eq.2 is for small strain, but it is possible to
> understand the relations between each parameters. And the purpose of
> section 5.4 is to compare the elastic energy of the proposed synthetic
> elastomer with the others of previous research. So, as mentioned in
> paragraph of section 5.4, we used same experiment condition and
> equation.
>
> \* The limitation of the Eq.2 is mentioned in the section 2.

6.  • **Table 1:** the repetition of "*Synthetic elastomer\*"* has to be
    erased.

> \* That is erased.

7.  • **Section 5.4, last sentence:** The number 0.84 J/cm^3^ has to be
    corrected with 0.084 J/cm^3^

> \* That is corrected.

8.  • **Conclusions:** "*transformer*" should be changed with
    "*transducer*".

> \* That is revised.