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The estimation of catalytic parameters of metal acetylacetonates in isocyanate polymerization reactions
Author(s) -
Weisfeld L. B.
Publication year - 1961
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1961.070051607
Subject(s) - catalysis , isocyanate , chemistry , manganese , polymer chemistry , metal , dissociation (chemistry) , polymerization , inorganic chemistry , organic chemistry , polyurethane , polymer
The polyaddition process involving a hydroxy‐terminated linear polyester and an organic diisocyanate in the presence of a series of metal acetylacetonates has been investigated. The method involved kinetic analysis of plasticity build‐up in a Brabender Plastograph. Catalytic orders and relative catalytic constants ( k c / k 0 ) were determined for Mn(Aa) 3 , VO(Aa) 2 , V(Aa) 3 , Fe(Aa) 3 , Cu(Aa) 2 , Co(Aa) 3 , and Cr(Aa) 3 ; the constants decrease in that order. Catalytic orders are unity for all complexes save manganese, which is 1.75. No correlation between dissociation potential and catalytic coefficient has been found, and it is believed that catalysis may be associated with the paramagnetic properties of the metal.