Piezoelectricity in nylon 11
Abstract
At the present time only poled, crawn poly vinylidene fluoride PVF 2 films give evidence of sufficiently high piezoelectric response to be useful in device applications, and for this reason the great majority of research has centered around this polymer. As in the case of PVF 2, many of the odd nylons crystallize in a polar space group with a large net dipole moment in the unit cell. On the basis of the understanding now reached of the properties of poled PVF 2 films it would appear that the occ nylons have the potential to make films with high piezoelectric activity. Piezoelectricity and pyecelectricity in nylon 11 films have been studied previously and piezoelectric strain coefficients found were higher than most polymers but still two orders of magnitude less than the corresponding activity found in poled oriented PVF 2 d 31 approx. 20p C/N . Studies carried out in this laboratory have shown that by appropriate variation of poling conditions and sample microstructure quite large piezoelectric constants can be obtained for nylons 11 films d 31 approx. 3p C/N. The dependence of the piezoelectric strain constant d 31 on poling temperature, poling field and crystal structure will be discussed.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- April 1980
- Bibcode:
- 1980STIN...8027609N
- Keywords:
-
- Fluoropolymers;
- Nylon (Trademark);
- Piezoelectricity;
- Crystal Structure;
- Dipole Moments;
- High Pressure;
- Microstructure;
- Electronics and Electrical Engineering