Abstract
The potential surface for the motion of cyclic groups in polyimide based on pyromellitic acid and p-phenylenediamine is calculated in the atom-atom approximation, making allowance for local density fluctuations. The values of the internal rotation barriers for phenylene and pyromellitimide rings are found. In regular crystalline polyimides, apart from torsional vibrational mobility of the pyromellitimide rings, rotational motion of the phenylene rings is also possible. The heights of the energy barriers for rotation of the rings are determined by the energy consumed when fluctuations occur, and by inter- and intralayer interactions.
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.
