Abstract
The rate of copolymerization, average copolymer composition, and copolymer sequence distribution for poly (vinyl chloride sulfone) prepared over a wide range of temperatures and comonomer concentrations were studied in order to test the applicability of different polymerization mechanisms. The polymers were prepared by ..gamma..-irradiation of the liquid copolymer mixtures or by initiation with tert-butyl hydroperoxide/methanol at low temperatures. After drying the /sup 1/H-nmr spectra of the polymers was obtained. The propagation/depropagation reactions for the olefinic compounds (M) copolymerized with SO/sub 2/(S) are represented by the two equations: approximately MSM. + S reversible approximately SMS. approximately SMS. + S reversible approximately MSM. . The existence of a strong pen-penultimate effect on the depropagation of approximately MS. radicals is reported; and the contrast in depropagation of approximately SMS. radicals which depropagate at low temperatures, i.e. between -80 and 0/sup 0/C and approximately MSM. radicals which are much less susceptible to depropagation at low temperatures is pointed out. Above 0/sup 0/C the SO/sub 2/ content of the polysulfone was noted to decrease further. This is explained by depropagation of either approximately MMS. or approximately MSM.
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 callMore From: Journal of Polymer Science: Polymer Letters Edition
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.
