2004 Fiscal Year Final Research Report Summary
The new manufacturing method of the chiral polymer film and its physical prnperties which originates from the packing effect
| Project/Area Number |
15550100
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer chemistry
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| Research Institution | Kansai University (2004)
Yamagata University (2003) |
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Principal Investigator |
THJITSU Yoshiro Kansai University, Faculty of Engineering, Professor, 工学部, 教授 (00282236)
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| Project Period (FY) |
2003 – 2004
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| Keywords | Poly-r-benzvl-l-glutamate Actuators / Piezoelectricitv / Magnetic field / Actuators / Fiber / Polylactic Acid / film |
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| Research Abstract |
The possibility has been indicated that polymers with helical chirality, such as poly-r-benzyl-L-glutamate (PBLG) and poly-L-lactic acid (PLLA), exhibit a large shear piezoelectric constant.
We fabricated poly-L-lactic acid (PLLA) fiber samples using high-speed spinning in order to improve their piezoelectricity. If an electric field is applied to the PLLA fiber in the direction perpendicular to its fiber axis, the PLLA fiber must be driven by the piezoelectric effect. We developed an effective method of applying an electric field to the PLLA fiber. As a result, we could drive the PLLA fiber by the shear piezoelectric effect under the application of ac voltage, and observed the bending motion of the entire PLLA fiber. Next, we have designed tweezers using a pair of PLLA fibers controlled by applied ac voltage, and have pursued the realization of PLLA fiber tweezers; finally, this was achived.
To attempt the realization of a PBLG membrane with a large piezoelectric constant, we fabricated
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the PBLG membrane oriented by magnetic field force. Concretely, the PBLG membranes were casted from 1,2-dichloroethane solution with various PBLG concentrations under the magnetic field generation equipment incorporating a superconducting magnet. First, the orientation of the chain molecules of the PBLG membranes obtained was observed macroscopically by means of a polarizing microscope (POM). The orientation of the chain molecules of the PBLG membranes was recognized for the case of casting from the PBLG I,2-dichloroethane solution in the liquid crystal state. Also, from X-ray photograph measurements, it was found that the orientation direction of the chain molecules of PBLG was perpendicular to the magnetic field direction. We then measured the shear piezoelectric constant d14 of the oriented PBLG membranes. With increasing the strength of the applied magnetic field in the casting process for the film preparation, d14* of the PBLG membranes obtained increases. Finally, a large piezoelectric constant of 26 pC/N was found in the PBLG membrane. It is assumed that dl 4* is not saturated even at the magnetic field of 10 T. Less
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