Abstract
The triad and pentad tacticities of PAN obtained by precipitation polymerization in supercritical carbon dioxide, using AIBN as initiator, (hereafter, referred as CO2-PAN) were analyzed by 13C NMR and IR method. The pentad tacticities of CO2-PAN from the intensities of cyano peaks were examined by statistical methods. It was found that CO2-PAN was completely random in stereoregularity, and the sequence distributions of it obey Bernoulli statistics. Compared with the aqueous phase suspension polymerization of AN, using AIBN as initiator, (hereafter, referred as S-PAN) and aqueous phase precipitation polymerization of AN, using redox type initiator, (hereafter, referred as R-PAN), it was found isotacticity of CO2-PAN was lower than those of S-PAN and R-PAN, although the three kinds of PAN were all random in stereoregularity. The reason is probably due to the different polar property of solvent used. The relation between IR data and stereoregularity of PAN has also been used to calculate the isotactic triad units of CO2-PAN, the result is accordant with the 13C NMR method used.
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.
