Improving Glass Transition Temperature and Toughness of Epoxy Adhesives by a Complex Room-Temperature Curing System by Changing the Stoichiometry
Abstract
:1. Introduction
2. Materials and Methods
2.1. Chemicals
2.2. Formulation and Cure Schedules
2.3. Kinetic Analysis of the Curing Process Using Differential Scanning Calorimetry (DSC)
2.4. Curing Time Analysis
2.5. Viscoelastic Properties of the Cured Material
2.6. Tensile Testing
2.7. Shear Testing
3. Results and Discussion
3.1. Kinetic Analysis of Curing Process by DSC
3.2. Rheological Analysis of Curing Process
3.3. Thermomechanical Characterization by DMA
3.4. Mechanical Characterization
3.4.1. Tensile Strength
3.4.2. Lap Shear Strength
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample | Weight Ratio Epoxy/Crosslinker | Cure Time |
---|---|---|
D01 (Reference) | 1:1 | r.t. (1 week) |
D02 | 1.5:1 | r.t. (1 week) |
D03 | 2:1 | r.t. (1 week) |
D04 | 4:1 | r.t. (1 week) |
Sample | First Peak | Second Peak | ||
---|---|---|---|---|
ΔHexo (J·g−1) | T°max (°C) | ΔHexo (J·g−1) | T°max (°C) | |
D01 | 127.2 | 78 | 74.3 | 106 |
D02 | 99.3 | 79 | 79.4 | 107 |
D03 | 76.7 | 77 | 10.,7 | 124 |
D04 | 48.8 | 77 | 49.5 | 128 |
Sample | Max. Tensile Strength (MPa) | Elongation | Young’s Modulus (MPa) |
---|---|---|---|
D01 | 4.9 ± 0.63 | 23.5 ± 1.4 | 15.8 ± 1.1 |
D03 | 14.3 ± 1.5 | 23.2 ± 2.7 | 59 ± 2.3 |
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Ruíz de Azúa, O.; Agulló, N.; Arbusà, J.; Borrós, S. Improving Glass Transition Temperature and Toughness of Epoxy Adhesives by a Complex Room-Temperature Curing System by Changing the Stoichiometry. Polymers 2023, 15, 252. https://doi.org/10.3390/polym15020252
Ruíz de Azúa O, Agulló N, Arbusà J, Borrós S. Improving Glass Transition Temperature and Toughness of Epoxy Adhesives by a Complex Room-Temperature Curing System by Changing the Stoichiometry. Polymers. 2023; 15(2):252. https://doi.org/10.3390/polym15020252
Chicago/Turabian StyleRuíz de Azúa, Oiane, Núria Agulló, Jordi Arbusà, and Salvador Borrós. 2023. "Improving Glass Transition Temperature and Toughness of Epoxy Adhesives by a Complex Room-Temperature Curing System by Changing the Stoichiometry" Polymers 15, no. 2: 252. https://doi.org/10.3390/polym15020252