| Since PVDF was developed by Japanese scientists in 1970S, few countries could manufacture the novel piezoelectric polymer films so far. Currently, when used as the electronic units, more and more defects from the PVDF films were exposed. For example, it is difficult to obtain the full or large thickness of 1mm piezoelectric films because of its low rate of finished products, which lead to the raise of the film price result from a plenty of wastes of the raw PVDF material. Moreover, some feedback from the customers has pointed the low stability of PVDF film. The piezoelectric sign was often weakened as service time increased because the film was stretched with the relaxor or intense stress frequently. |
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