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Curing kinetics of cyanated poly(ether sulfone)s of different molecular weight
Author(s) -
Chang JerYuan,
Hong JinLong
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021961126
Subject(s) - autocatalysis , kinetics , differential scanning calorimetry , curing (chemistry) , polymer chemistry , chemistry , sulfone , ether , activation energy , catalysis , organic chemistry , thermodynamics , physics , quantum mechanics
Three cyanated poly(ether sulfone)s (CPESs) with number‐average molecular weights of 910, 1550 and 3 240 were synthesized and their polycyclotrimerization kinetics studied by dynamic differential scanning calorimetry (DSC). The resulting apparent activation energies ( E a ) are quite close and range from 87.5 to 92.0 kJ/mol. The corresponding curing reactions in relation to conversion (α) can be expressed with an autocatalytic first‐order kinetics dα/d t = A (1+ B α) (1 – α) exp (– E a /( RT )). This kind of kinetics can be explained by a mechanism consisting of both a hydroxyl‐catalyzed and an autocatalytic path. The lower pre‐exponential factor ( A ) and contribution of autocatalytic reaction ( B ) for high molecular weight CPES are due to the low concentrations of catalytic species in the starting CPES and the resulting sym ‐triazine rings, respectively.