Insights into anhydride-cured epoxy resin system using dynamic chemo-rheological modeling

Anhydride-cured epoxy resin is preferred over its contemporary because it is less poisonous, produces reduced heat during curing, and exhibits lower curing shrinkage. Hence, this work helps to understand the curing process of the mentioned resin. The non-isothermal chemo-rheological behavior of the...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2023-12, Vol.80 (12), p.13299-13317
Main Authors: Mohanta, Santoshi, Sankhla, Sangeeta, Namboothiri, Karthika K., Kuppusamy, Raghu Raja Pandiyan, Neogi, Swati
Format: Article
Language:English
Subjects:
Activation energy
Anhydrides
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Curing
Epoxy resins
Kinetics
Methods
Molecular weight
Organic Chemistry
Original Paper
Physical Chemistry
Polymer Sciences
Polymers
Product development
Rheological properties
Rheology
Soft and Granular Matter
Temperature effects
Viscosity
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Summary:Anhydride-cured epoxy resin is preferred over its contemporary because it is less poisonous, produces reduced heat during curing, and exhibits lower curing shrinkage. Hence, this work helps to understand the curing process of the mentioned resin. The non-isothermal chemo-rheological behavior of the anhydride-cured epoxy resin system is investigated by performing differential scanning calorimetry and rheometry at five different heating rates: 1 °C/min, 2 °C/min, 5 °C/min, 8 °C/min, and 10 °C/min. Gelling time found using DSC and rheology are comparable. Activation energies ( E a ) and other cure parameters are determined by the iso-conversional KAS, FWO, Friedman, and model-free Kissinger’s approach, and the average values are compared. Dependencies between E a and degree of conversion ( α ) describe the complex cure process of the epoxy resin system. The activation energy trends indicated that the cure reaction follows two phases: cure kinetics controlled, and diffusion is the controlling factor in the second phase. Furthermore, the Arrhenius viscosity model is used to predict the viscosity profile during non-isothermal curing. The predicted viscosity model significantly agrees with the experimental data and correlates kinetics with the complex viscosity of the epoxy resin. Graphical abstract
ISSN:0170-0839
1436-2449
DOI:10.1007/s00289-023-04711-x