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Kinetic and rheokinetic study of dicarboxylic fatty acid chain extension using a dioxazoline coupling agent
Author(s) -
Chalamet Yvan,
Taha Mohamed
Publication year - 1999
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/(sici)1097-4628(19991024)74:4<1017::aid-app29>3.0.co;2-y
Subject(s) - molar mass , kinetic energy , reactivity (psychology) , activation energy , polymer chemistry , chemistry , viscosity , oxazoline , reaction rate constant , shear thinning , thermodynamics , kinetics , polymer , materials science , organic chemistry , composite material , catalysis , medicine , physics , alternative medicine , pathology , quantum mechanics
A kinetic and rheokinetic study of the condensation reaction of a dicarboxylic fatty acid, Pripol®1009 (C36), and a dioxazoline coupling agent (1,3‐Phenylene)‐bis(2‐Oxazoline) (OO) was made. The kinetic study showed a similar reactivity of the two acid groups of C36 and also a similar reactivity of the two oxazoline groups of OO. The reaction kinetics can be described using a second‐order kinetic model. A kinetic constant k = 16.1 × 10 −4 mol −1 s −1 at 156°C with an activation energy E a = 80.6 kJ mol −1 was calculated. A rheological evaluation of the reactants and the obtained polymers showed that the reactive system had Newtonian behavior during all the reaction times for shear rates lower than 100 s −1 . Using this kinetic modeling and measured viscosity evolution of the reactive system at different temperatures, rheokinetic models were proposed for viscosity evolution with the molar mass evolution of the synthesized polymer and the reaction time and conversion. Viscosity evolution of the reactive system during the first 10 min, corresponding to a typical mean residence time in reactive extrusion, were calculated using the proposed rheokinetic model. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1017–1024, 1999