Abstract
Dielectric constant ( ε′), loss factor (tan δ) and molecular dynamic behavior of liquid crystalline epoxy cured with diamine were studied by thermally stimulated discharge current (TSC) technique and were compared with the conventional epoxy system. The relaxation time τ and the activation energy of reorientation of the dipoles for each TSC characteristic band were expressed as Arrhenius relationship. Liquid crystalline epoxy (LCE) monomer was diglycidyl ether of biphenyl (DGEBP) and the conventional epoxy was diglycidyl ether of bisphenol A (DGEBA). The conventional epoxy had two sub-Tg relaxations; γ-relaxation was related to the motion of glycidyl ether segment and β-relaxation was due to the crankshaft motion of the hydroxylether group. LCE thermoset exhibited another γ′-relaxation in addition to those two relaxations; the reorientation of mesogenic unit. The para-ether linkage of the biphenyl mesogenic unit allows it to rotate without disturbing neighborhood unit.
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.
