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Effects of rubbers and thermoplastics as additives on cyanate polymerization
Author(s) -
Cao ZhiQiang,
Mechin Françoise,
Pascault JeanPierre
Publication year - 1994
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.1994.210340107
Subject(s) - polymerization , cyanate ester , cyanate , polymer chemistry , acrylonitrile , copolymer , monomer , materials science , thermoplastic , nitrile rubber , polymer , natural rubber , chemistry , chemical engineering , composite material , epoxy , engineering
Several rubber (acrylonitrile–butadiene copolymer) or thermoplastic (polyethersulfone) additives bearing different chain ends were introduced into pure aromatic dicyanates. We studied the influence of these initially miscible modifiers on the polymerization kinetics, as a function of their chemical structure and concentration. It appears that apart from those bearing a labile hydrogen atom, the additives play almost no role on the polycyclotrimerization rate; neither does phase separation. However, the additives influence the structure of the final networks insofar as they partially dissolve in the matrix and thus modify both the final T g and the onset of vitrification, compared with the pure monomer. Finally, the amino‐ or phenolic additives can react with cyanate functions and produce adducts which are well‐known catalysts for cyanate cyclotrimerization; in their presence, a marked enhancement of the polymerization rate can thus be observed, together with the thermal effects mentioned above.