Abstract
AbstractUV–thermal‐cured cycloaliphatic epoxy resin (CAE) has received great attention due to high curing efficiency, low energy consumption and wide application. However, this rigid polymer with a highly crosslinked network tends to exhibit substantial brittleness. Herein, a novel toughening agent was successfully prepared by modifying nanocrystalline cellulose with Ca2+ (NCC‐Ca). The chemical structure of NCC‐Ca was characterized using Fourier transform infrared and X‐ray photoelectron spectroscopies. Mechanical properties, moisture absorption and thermal properties of UV–thermal‐cured NCC/CAE and NCC‐Ca/CAE composites were comprehensively evaluated. With a NCC‐Ca content of 0.7 wt%, the impact strength of NCC‐Ca/CAE composites was maximized at 5.96 kJ m−2, while the flexural strength of NCC‐Ca/CAE composites with 0.5 wt% of NCC‐Ca was maximized at 52.02 MPa. Along with the improvement in mechanical properties, NCC‐Ca can also increase the glass transition temperature of CAE composites. Moreover, the toughening mechanism of the NCC‐Ca/CAE composites is also discussed. © 2021 Society of Industrial Chemistry.
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