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Cure kinetics and thermodynamics of polyurethane network formation based on castor oil based polyester polyol and 4,4’-diphenyl methane diisocyanate

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Title Cure kinetics and thermodynamics of polyurethane network formation based on castor oil based polyester polyol and 4,4’-diphenyl methane diisocyanate
 
Creator Balakrishnan, Remya
Varghese, Lity Alen
Manu, S K
 
Subject Activation Energy
DSC
Polyurethane
Viscosity build up
 
Description 336-342
In this work, isothermal curing kinetics of a non-catalysed and non-blown reaction between castor oil based polyester
polyol and polymeric 4, 4’-diphenyl methane diisocyanate (MDI) has been investigated using Differential Scanning
calorimeter (DSC) and viscosity build up studies. Several phenomenological models like Ozawa, Kissinger and Kissinger-
Akahira-Sunose (KAS) isoconversional methods has been adopted to study polymerisation kinetics through DSC. DSC cure
kinetics is studied at different heating rates (5°C/min, 10°C/min, 15°C/min and 20°C/min). Viscosity build up studies are
also done for evaluating the kinetic parameters. These studies have been conducted for an isocyanate index
[NCO equivalents/OH equivalents] of 1:1 and 1:2. Dynamic viscosity is measured as a function of time and rate constant
and activation energy of the curing system is evaluated. Activation energy obtained for 1:1 index through Ozawa and
Kissinger methods is found to be in the range of 70kJ/mol and for 1:2 index it is found to be in the range of 50kJ/mol.
Thermodynamic parameters like Gibb’s free energy (Activation Free Energy), activation enthalpy and activation entropy of
the polymerisation kinetics is calculated using Wynne-Jones-Eyring-Evans Theory.
 
Date 2021-08-05T06:05:04Z
2021-08-05T06:05:04Z
2021-05
 
Identifier 0975-0991 (Online); 0971-457X (Print)
http://nopr.niscair.res.in/handle/123456789/57838
 
Publisher NIScPR-CSIR, India
 
Source IJCT Vol.28(3) [May 2021]