Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4996059 | Thermochimica Acta | 2017 | 6 Pages |
Abstract
Kinetics of polymerization of N,Nâ²-bismaleimide-4,4â²-diphenylmethane (BMI) with cyanuric acid (CA) in N-methyl-2-pyrrolidone (NMP) was investigated. Both model-free and model-fitting methods were used to determine the relevant kinetic parameters. For the model-free method, the average activation energy (Eα) and pre-exponential factor (Aα) are 23 ± 1 kJ molâ1 and 162 ± 2 minâ1 in the α range 0.1-0.9, respectively. The Aα value obtained is a result of the model assumption with g(α) = âln(1 â α) [i.e. f(α) = (1 â α)], which is based on 1H NMR measurements. As to the model-fitting method, the overall activation energy (E) and pre-exponential (A) are 23 kJ molâ1 and 166 minâ1 with g(α) = [(1 â α)0.15 â 1]/0.15 {i.e. f(α) = (1 â α)1.15}. The polymerization kinetics and mechanism of BMI/CA in NMP were characterized by DSC. Furthermore, complementary 1H NMR and 13C NMR techniques were used to identify the chemical structure of CA in the reaction medium and, therefore, the reaction mechanism (model) was predicted.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Quoc-Thai Pham, Jung-Mu Hsu, Fu-Ming Wang, Mei-Ping Chen, Chorng-Shyan Chern,