Abstract
Thin films of aromatic and aliphatic polyureas are prepared by the evaporation and deposition of a diamine monomer and a diisocyanate monomer onto a polyimide substrate in a vacuum chamber. Application of a high electric field induces the films a residual polarization due to the alignment of urea bond dipoles. The piezoelectric constants for aromatic polyureas are almost unchanged from -150/spl deg/C to 200/spl deg/C. While those for aromatic polyureas show relaxational change due to the thermal molecular motions.
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.
