Optimization of piezoelectric properties of cellular polypropylene films by repeated expansion

@article{Zhang2005OptimizationOP,
  title={Optimization of piezoelectric properties of cellular polypropylene films by repeated expansion},
  author={Xiaoqing Zhang and G. M. Sessler and Joachim Hillenbrand},
  journal={2005 12th International Symposium on Electrets},
  year={2005},
  pages={51-54}
}
The piezoelectric d/sub 33/-coefficients of customary cellular polypropylene (PP) films can be significantly improved by a double-expansion process. In the present paper, the experimental procedure is described and experimental results of d/sub 33/-coefficients that can be achieved by choosing expansion pressures of 2 MPa and a range of expansion temperatures up to 120/spl deg/C for the two expansion processes are discussed. For example, a temperature of 90 to 100/spl deg/C for the first… CONTINUE READING