| 摘要 |
<p>PURPOSE:To manufacture a piezoelectric film of superior piezoelectric resistance to heat with slight lowered piezoelectricity when heat history is received by rolling a polyvinylidene fluoride family film at the given rolling temperature and then poling. CONSTITUTION:A polyvinylidene fluoride family film is a film composed of polyvinylidene fluoride family polymer. Said film is rolled by using a pressure roll, and the film temperature at the time of rolling is in the range of 100 - 140 deg.C. When the rolling temperature is lower than 100 deg.C, type I crystal lamella size gets smaller to lower the piezoelectric resistance to heat, while beyond 140 deg.C, the transition to type I crystals is not completed to remain type II crystals not to form large spontaneous polarization. A rolled film thus manufactured is poled to manufacture a piezoelectric film. As the film is rolled in the temperature range of 100 - 140 deg.C in said piezoelectric film manufacturing process, perfect crystal transition from type II crystals to type I crystals is generated, and as the rolling is performed under the high temperature, the crystal lamella is grown large to enhance piezoelectric resistance to heat to a large extent.</p> |
