title: Fundamental study on improvement of piezoelectricity of poly(ι-lactic acid) and its application to film actuators.
abstract: We designed a new film actuator, whose driving force is generated by a surface wave, which induces rotational motion. Its performance is similar to that of a rotation motor even though the new film actuator has no complex mechanical parts. To realize the film actuator, we used a poly(l-lactic acid) (PLLA) film with improved piezoelectricity. First, we theoretically investigated the necessary conditions for a surface wave to be generated on the end face of a PLLA film by the fusion of its shear piezoelectricity and resonance, and then experimentally realized this. Using the actuator made using the PLLA film, we demonstrated that the clockwise and counterclockwise rotation of an object placed on the end face of the PLLA film actuator could be freely controlled by changing the frequency of the ac voltage applied to the actuator.
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Tajitsu
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry* / Q000528:radiation effects; D011211:Electric Power Supplies; D004867:Equipment Design; D019220:High-Energy Shock Waves; D019344:Lactic Acid / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D008567:Membranes, Artificial; D055617:Micro-Electrical-Mechanical Systems / Q000295:instrumentation*; D011091:Polyesters; D011108:Polymers / Q000737:chemistry* / Q000528:radiation effects; D014159:Transducers
chemical_list: D001672:Biocompatible Materials; D008567:Membranes, Artificial; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide)