Abstract
Submicron films of aliphatic polyurea-5 were synthesized by vapor deposition polymerization. The structure of films depended on the partial pressure ratio of evaporated monomers. Excess of diamine monomer over diisocyanate monomer yielded lower crystalline structure, to be poled easier at low temperatures. The maximum value of the piezoelectric stress constant e31 was 10 m C/m2, twice that of polyurea-9. The pyroelectric constant was about 15 μC/m2 K. Ferroelectric D-E hysteresis was observed. Three relaxations were observed for the temperature dependence of the elastic constant, the dielectric constant, and the piezoelectric constant. The poling dynamics involving urea dipoles and ionic species was discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
