Piezoelectric Characteristics of Polymer Film Oriented under a Strong Magnetic Field

Nakiri, Takuo; Imoto, Kenji; Ishizuka, Masato; Okamoto, Satoshi; Date, Munehiro; Uematsu, Yoshiko; Fukada, Eiichi; Tajitsu, Yoshiro

doi:10.1143/jjap.43.6769

Cited by 29 publications

(34 citation statements)

References 25 publications

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“…Although relatively small, this value is close to the results from Fukada's original work [14]. This result makes us question Nakiri and Fukada's recently reported high d 14 value of 26 pC/N, which they claim to be due to enhanced alignment of PBLG helices by poling under extremely high magnetic field (10 Tesla) [20]. This value needs to be validated as it seems unexpectedly high, especially when compared to our PBLG film, which also has very high orientational order due to the unique electrospinning and hot pressing process.…”

Section: Resultssupporting

confidence: 87%

“…When films of helical polymers are exposed to shear stress by application of tensile forces 45 • to the helical axis, the shear deformation of the helical chains follows the chiral nature of the polymer chains, which results in the development of new net electrical dipole across the film thickness direction [23]. Recently in 2004, Nakiri and Fukada reported that the piezoelectric coefficient d 14 of this film can be as high as 26 pC/N if polymers are aligned by strong magnetic field (10 Tesla) [20]. In Fukada's work, the alignment of the PBLG molecules is mainly caused by the interactions between the external magnetic field and the induced magnetic field originating from the electron-rich benzyl side chains.…”

Section: Classification Of Piezoelectric Polymersmentioning

confidence: 99%

“…They showed that application of magnetic field or mechan- Fig. 1 Schematic drawings of molecular dipole orientation associated with class I and class II types of piezoelectric polymer system ical force to this material in film form can produce uniaxial orientation of the polymer chains, which led to a strong piezoelectric property in shear mode with piezoelectric coefficient d 14 ranging from 1 to 2 pC/N [14][15][16][17][18][19][20]. Despite attempts by numerous researchers, piezoelectric coefficients in d 33 and d 31 mode have not been determined for this material because of inability to fabricate films with all helical dipoles poled in one direction [21].…”

Section: Introductionmentioning

confidence: 99%

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Piezoelectric property of hot pressed electrospun poly(γ-benzyl-α, L-glutamate) fibers

et al. 2012

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Since the 1960s, the piezoelectricity in biopolymers (e.g. proteins and polynucleotides) has attracted considerable scientific attention. In particular, poly(glutamate)s have been one of the most popular targets for this research due to their well-defined helical structure and permanent polarity along the helical axis. To date, films of poly(glutamate)s have been shown to exhibit piezoelectricity only in shear mode (d 14 ), mainly due to the limitation in fabricating electrically poled polymer samples. This paper describes a combined electrospinning and hot press method that allows production of poled poly(γ -benzyl-α,Lglutamate) (PBLG) films with piezoelectricity in all d 33 , d 31 and d 14 modes for the first time. It is found that this PBLG film belongs to the matrix structure of C ∞v group, which is the same as that of poled PVDF film. The moderately high piezoelectric coefficients in both d 33 and d 14 modes as well as their thermal stability make the poled PBLG film an excellent candidate for use in flexible transducers and small energy harvesting devices.

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Section: Resultssupporting

confidence: 87%

Section: Classification Of Piezoelectric Polymersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Piezoelectric property of hot pressed electrospun poly(γ-benzyl-α, L-glutamate) fibers

et al. 2012

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“…Tajitsu et al [54] undertook to apply a strong magnetic field to orient the helical molecules of PBLG during cast from the 1,2-dichloroethane liquid crystalline solution. X-ray diffraction patterns clearly showed the helical molecules are oriented perpendicularly to the magnetic field (Fig.23).…”

Section: Biopolymersmentioning

confidence: 99%

Recent developments of polar piezoelectric polymers

Fukada

2006

IEEE Trans. Dielect. Electr. Insul.

117

119

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Following the extensive studies on the piezoelectric, pyroelectric and ferroelectric properties of polyvinylidene fluoride and its copolymers, a vast number of polymers were investigated for these properties. Piezoelectric thin films of polyurea were prepared by vapor deposition polymerization in vacuum and stable up to 200 o C. Piezoelectric odd nylon was characterized by the field induced rotation of amide dipoles in the molecular sheet crystalline structure. Completely amorphous vinylidene cyanide copolymers produced a remanent polarization proportional to the large dielectric relaxation strength during poling. Drawn films of polylactic acid exhibited the large shear piezoelectricity due to the crystalline structure of helical molecules, however, a remnant polarization was also produced by poling at high temperatures. Various polymers containing dipolar groups of carbonyl, urethane, urea and thiourea bonds were poled and their ferroelectric hysteresis was observed. Application of magnetic field as high as 10 Tesla to the liquid crystalline state of helical molecules of poly-γ-benzyl-L-glutamate during film formation resulted in a very high shear piezoelectric constant 26 pC/N. Unprecedented high piezoelectric constant such as 1000 pC/N was found in the highly hydrated cornea membrane consisting of collagen fibrils.

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“…4,5,8) We have reported that the orientation technique using a strong magnetic field was effective for PBLG, and the shear piezoelectricity was also improved. 22,23) However, at present, it is not possible to obtain a uniform PBLG film with high shear piezoelectricity, and the mechanism of the induction of the shear piezoelectricity of a PBLG film oriented by a strong magnetic field has not been sufficiently clarified. Also, in previous reports, 23,24) it is indicated that a domain with a diameter of about 100 nm is required if a magnetic field of 10 T is applied to a sample with a magnetic susceptibility of 10 À7 at a temperature of 340 K. [16][17][18][19][20][21] In this study, the shear piezoelectricity of a PBLG film oriented by a strong magnetic field was investigated in order to obtain optimal conditions for fabricating a stable film with a high shear piezoelectric constant.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric Characteristics of Poly(γ-benzyl-L-glutamate) Film Oriented under Strong Magnetic Field

Uehara¹,

Fukumoto²,

Kamimura³

et al. 2011

Jpn. J. Appl. Phys.

Self Cite

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To attempt the realization of a highly piezoelectric polymer film, we used an oriented poly(-benzyl-L-glutamate) (PBLG) film that was cast from chloroform solution under the strong magnetic field induced by a generation apparatus using a superconducting magnet. First, the orientation of the PBLG principal chain in the film was observed macroscopically by polarizing microscopy (POM), and it was found that the orientation of the principal chain differed in each region. Then, in order to observe each region, using our original apparatus, the birefringence (retardation) and optical axis were measured at 100 m pitch/point-to-point, and a cm-order region with high retardation was found. We then cut off a small piece from this region of the PBLG film and evaluated the shear piezoelectric constant. A large shear piezoelectric constant of 18 pC/N was found in the small piece. Also, the PBLG film was investigated by atomic force microscopy (AFM). We found a characteristic slender structure in the region with a high macroscopic shear piezoelectric constant. Furthermore, the piezoelectric motion due to its shear piezoelectricity in the region was investigated microscopically by piezoresponse force microscopy (PFM), which successfully enabled the direct observation of the piezoelectric displacement due to its shear piezoelectricity in one direction in the entire region with the characteristic slender structure. On the basis of these results, we speculate that the principal chain was highly oriented and crystallized in the region with the characteristic slender structure, resulting in a large shear piezoelectric constant in the region. #

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Piezoelectric Characteristics of Polymer Film Oriented under a Strong Magnetic Field

Cited by 29 publications

References 25 publications

Piezoelectric property of hot pressed electrospun poly(γ-benzyl-α, L-glutamate) fibers

Piezoelectric property of hot pressed electrospun poly(γ-benzyl-α, L-glutamate) fibers

Recent developments of polar piezoelectric polymers

Piezoelectric Characteristics of Poly(γ-benzyl-L-glutamate) Film Oriented under Strong Magnetic Field

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