Abstract
The flow birefringence method has been used to investigate sulphuric acid solutions of the two series of polyhydroxyphenylbenzoxazoleterephthalamides differing as to the position of the phenyl ring ( para- or meta-) in the chain. On the basis of the method, using the Tsvetkov theory of flow birefringence we obtained, as a result of quantitative evaluations, values for the optical anisotropy of the monomer unit Δa = (330 ± 30) × 10 −25 cm 3 and the Kuhn segment length A = (330 ± 30) and (115 ± 20) Å for the para- and meta-isomers respectively. An analysis of flexibility mechanisms for the chains of both monomers gives theoretical values of the rigidity parameter A that are in keeping with the experiment values, thus substantiating validity of the molecular models being used.
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.