Abstract
AbstractThe dielectric constants and losses have been measured at 20°C. and wavelengths of 1.25, 3.22, 10.0, 25, and 50 cm., and 575 m. for a series of dilute benzene solutions of a polyester of 1,2‐propylene glycol and adipic acid with molecular weight between 5,000 and 7,000. The dielectric constant and loss values are plotted against the weight concentrations of the solute and the slopes of the straight lines thus obtained are examined by four different methods of analysis. The data may be represented in terms of two parameters, a most probable relaxation time and a distribution factor, two relaxation times, or a distribution of relaxation times between two limiting values. The values obtained for the relaxation times are close to those previously found for long‐chain fatty acid esters and correspond to relaxation by twisting of short segments containing carboxy groups around bonds in the chain. A value 1.57 × 10—18 obtained for the effective dipole moment of the COOC group as compared to 1.9 × 10—18 in a small monoester indicates some restriction of rotation around the bonds because of mutual repulsion between the polar groups.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.