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Linkage Configurations at the Cyclic Maleic Anhydride Units and Sequence Distribution in Copolymers of p ‐Chlorostyrene with Maleic Anhydride
Author(s) -
RungAphinya Wanna,
Fujimori Kiyohisa,
Craven Ian E.,
Tucker David J.
Publication year - 1997
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199701)42:1<17::aid-pi638>3.0.co;2-4
Subject(s) - maleic anhydride , copolymer , triad (sociology) , polymer chemistry , acceptor , chemistry , equilibrium constant , materials science , polymer , organic chemistry , physics , psychology , psychoanalysis , condensed matter physics
Semi‐alternating copolymers were formed in the radical copolymerization of p ‐chlorostyrene ( p ‐ClSt) with maleic anhydride (Man) in CCl 4 solutions at 50°C. The triad distributions in the copolymers and the ratio of the amounts of entgegen ( E ) and zusammen ( Z ) linkage configurations at the cyclic Man units in the copolymers were determined by using 13 C nuclear magnetic resonance spectroscopy. The equilibrium constant of the electron donor–acceptor complexation of p ‐ClSt and Man in CCl 4 solution was determined to be 0·32±0·03 M ‐1 at 23°C. A non‐linear least‐square regression of the triad distribution data showed that the copolymerization models which involved complex participation were preferable, although not conclusively, to the penultimate unit model. As much as 40% of the linkages at the Man units in the semi‐alternating copolymers were found to be in the Z configuration, strongly indicating a participation of the donor–acceptor complex formed between p ‐ClSt and Man. © of SCI.