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Effect of catalysts on the reaction between a cycloaliphatic diisocyanate (H‐MDI) and n ‐butanol
Author(s) -
Yilgör Ískender,
McGrath James E.
Publication year - 1985
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.1985.070300437
Subject(s) - catalysis , stoichiometry , chemistry , isocyanate , butanol , kinetics , toluene , titration , chemical kinetics , reaction rate , reaction mechanism , polymer chemistry , order of reaction , inorganic chemistry , organic chemistry , reaction rate constant , polyurethane , ethanol , physics , quantum mechanics
Kinetics of the reaction between bis(4‐isocyanatocyclohexyl)methane, H‐MDI, and n ‐butanol was studied in toluene at 100°C. Effects of various catalysts, such as Hg(CH 3 COO) 2 , Zn(CH 3 COO) 2 · 2H 2 O, SnCl 4 · 5H 2 O, and dibutyltindilaurate on the reaction rate and kinetics were also investigated. Reactions were followed by determining the unreacted isocyanate as a function of reaction time, using the standard dibutylamine back titration method. All catalysts seem to be very effective in increasing of the rate of the reaction compared to the uncatalyzed system. Depending on the initial stoichiometric ratio of (NCO) and (OH) and the concentration of the catalyst used, it seems possible to have preferential catalysis of the primary reaction between (NCO) and (OH) over the side reactions.