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Microstructure of styrene copolymers with 2‐phenyl‐1,1‐dicyanoethene
Author(s) -
Kharas Gregory B.,
Mirau Peter A.,
Watson Kenneth,
James Harwood H.
Publication year - 1992
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/pi.4990280112
Subject(s) - copolymer , monomer , polymer chemistry , styrene , materials science , nuclear magnetic resonance spectroscopy , microstructure , dept , acceptor , proton nmr , crystallography , chemistry , polymer , stereochemistry , physics , composite material , condensed matter physics
Microstructure analysis of styrene copolymers with 2‐phenyl‐1,1‐dicyanoethene, as deduced from high resolution 1 H and 13 C NMR spectroscopy (DEPT, HETCOR, NOESY and JMODXH). demonstrated the formation of both head‐to‐head and head‐to‐tail alternating monomer structures. Conventional head‐to‐tail structures are explained as the result of cross propagation of ‘free’ monomers, whereas anomalous head‐to‐head structures are rationalized through the addition of monomer complexes of predicted geometry. The results indicated that the copolymer skeletal regioselectivity is dependent on participation of both free monomers and monomer donor‐acceptor complexes in the propagation steps of the copolymerization.