The synergist effect of calcium sulfate fillers on epoxy resin's adhesive properties with calcium sulfate fillers was evaluated. It is learned that the porosity of modified calcium sulfate fillers resulted in the achievement of a high tensile modulus. The addition of calcium sulfate fillers significantly increased the tensile modulus at lower wt % and achieved high crystalline CaSO4 composite. The scanning electron microscopy (SEM) shows an even distribution of concentrated CaSO4. Clusters formed at higher CaSO4 ratios produced large expansion, low crystallinity, and increased elongation. Further, it was observed that even distribution and dispersion of fillers enhanced transformation, greatly improved and enriched epoxy resin's bonding performance in the interfacial area. Enhancing the mechanical properties of epoxy resin via CaSO4 fillers have broadened applications prospect in environmental fields. This suggests and encourages the widespread use of CaSO4 fillers in environmental engineering in terms of adhesive properties.
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A 2020 study studied this question.
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