To provide a high-polymer piezoelectric material which is improved in production efficiency without making a large sacrifice in transparency.
A high-polymer piezoelectric material comprises an optically active helical chiral polymer molecule having a weight-average molecular weight of 50,000-1,000,000, and a crystal nucleus material. In the high-polymer piezoelectric material, the degree of crystallization is 20-80% according to DSC method. The transmission haze to visible light is equal to or smaller than 40%. The product of standardized molecular orientation MORc and the degree of crystallization is 40-700 when the reference thickness measured by means of a microwave transmission molecular orientation meter is 50 μm. The melting point Tma of the helical chiral polymer molecule, and the melting point Tmb of the crystal nucleus material satisfy the expression (1) below. The absolute value of the difference between the solubility parameter SPa(unit: (J/cm3)1/2) of the helical chiral polymer molecule, and the solubility parameter SPb(unit: (J/cm3)1/2) of the crystal nucleus material is 5 or less. Expression(1): Tmb≤Tma+70°C.
HAMAZAKI HIROHIDE
TAKEDATE MASAHIRO
NISHIKAWA SHIGEO
| JP2010280910A | 2010-12-16 | |||
| JP2010001338A | 2010-01-07 | |||
| JP2009179773A | 2009-08-13 |
| WO2012026494A1 | 2012-03-01 |
Kato Kazunori
Hiroshi Fukuda