Abstract
Poly(L-lactic acid) (PLLA), which is a type of chiral polymer, was subjected to a supercritical CO2 (s-CO2) treatment to change its high-order structure, realizing an improvement in its piezoelectricity. The piezoelectric constant e of the PLLA film treated with s-CO2 (sco2-PLLA) was twofold higher than that of the PLLA film fabricated by the conventional method. From observation by atomic force microscopy (AFM), it was found that, upon treatment with s-CO2, the grain structure of the sco2-PLLA film became homogeneous, in comparison with that in the PLLA film without s-CO2 treatment. Then, we confirmed that, using the sco2-PLLA film, vibration control using a negative-capacitance circuit could be more efficiently carried out than that using the PLLA film without s-CO2 treatment.
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