On the curing kinetics of epoxy/PLA compounds

Non-isothermal curing kinetics of DGEBA/PLA/MTHPA compounds was modeled using Ozawa, Kissinger, Friedman autocatalytic, Friedman and Málek models, whose parameters and associate deviation are reported. Ozawa and Kissinger consider global Ea over the whole conversion, estimated as 65.0 kJ/mol with R...

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Bibliographic Details
Published in:Journal of materials research 2021-07, Vol.36 (14), p.2973-2986
Main Authors: Silva, I. D. S., Barros, J. J. P., Jaques, N. G., Wellen, R. M. R.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Chemistry and Materials Science
Coils
Crosslinking
Curing
Hydrogen bonds
Inorganic Chemistry
Kinetics
Materials Engineering
Materials research
Materials Science
Molecular chains
Nanotechnology
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Summary:Non-isothermal curing kinetics of DGEBA/PLA/MTHPA compounds was modeled using Ozawa, Kissinger, Friedman autocatalytic, Friedman and Málek models, whose parameters and associate deviation are reported. Ozawa and Kissinger consider global Ea over the whole conversion, estimated as 65.0 kJ/mol with R 2 0.8393 and 87.60; these low R 2 are due to the several stages during curing with distinct energy needs which most likely conducted to the discrepancies that should not be ignored; nevertheless, the average E a might be adopted for the curing understanding, whereas adding PLA subtly increases E a . Málek’s model adequately described the kinetics processes as also did isoconversional and autocatalytic Friedman models which presented R 2  > 0.99. PLA’s molecular chains behaved as curing impediments, and during its progress, it is hypothesized that they increase the system’s swollen coils and eventually an interconnected structure that percolates the system results in (macro) gelation instead cross-linking; additionally, hydrogen bonds between PLA–DGEBA promote competitive reactions during reticulation. Graphic abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-021-00234-1