TY - JOUR
T1 - Kinetics of isocyanate amine reactions
AU - Pannone, Mary C.
AU - Macosko, Chris
PY - 1987/11/20
Y1 - 1987/11/20
N2 - Development of polyurea‐urethane and polyurea reaction injection molding (RIM) systems has created a need for kinetics of polyurea formation. Adiabatic batch reactions in solution were used to determine heats of reaction and relative reactivity of several aromatic amines and n‐butanol with phenyl isocyanate (PI). In addition to comparing times required to reach 25, 50 and 75% conversion for both catalyzed and uncatalyzed reactions, n‐th order models with Arrhenius rate constants were used to fit some of the exotherms. The reaction of 3,5‐diethyl toluene (2,4 and 2,6)‐diamine and PI could not be modeled due to unequal reactivity of the two amine groups. This unequal reactivity was studied using high performance liquid chromatography (HPLC) separation of the reaction products. The reactions of primary aliphatic amines and aromatic isocyanates were too rapid to be monitored in the batch apparatus. With a flow apparatus the reaction half time was estimated to be ∼ 0.002 s.
AB - Development of polyurea‐urethane and polyurea reaction injection molding (RIM) systems has created a need for kinetics of polyurea formation. Adiabatic batch reactions in solution were used to determine heats of reaction and relative reactivity of several aromatic amines and n‐butanol with phenyl isocyanate (PI). In addition to comparing times required to reach 25, 50 and 75% conversion for both catalyzed and uncatalyzed reactions, n‐th order models with Arrhenius rate constants were used to fit some of the exotherms. The reaction of 3,5‐diethyl toluene (2,4 and 2,6)‐diamine and PI could not be modeled due to unequal reactivity of the two amine groups. This unequal reactivity was studied using high performance liquid chromatography (HPLC) separation of the reaction products. The reactions of primary aliphatic amines and aromatic isocyanates were too rapid to be monitored in the batch apparatus. With a flow apparatus the reaction half time was estimated to be ∼ 0.002 s.
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U2 - 10.1002/app.1987.070340707
DO - 10.1002/app.1987.070340707
M3 - Article
AN - SCOPUS:0023454287
SN - 0021-8995
VL - 34
SP - 2409
EP - 2432
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
IS - 7
ER -