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Functionalized Copolymer-Mediated Interfacial Optimization in Carbon Fiber-Reinforced Epoxy Composites
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DOI：10.1002/pc.71320.png)
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Abstract
En 中文
To meet green manufacturing requirements and further enhance interfacial crosslinking density, an environmentally friendly ethanol/water mixed solvent system was used. Using RAFT polymerization, this system synthesized an eco-friendly copolymer sizing agent (PAE) with high hydrophilicity and high reactivity. The main chain of PAE is rich in hydroxyl side chains and incorporates terminal carboxyl groups. CF-PAE-1, obtained through impregnation treatment, successfully constructed a bidirectional chemical “stitching” network on the fiber surface. Its surface energy significantly increased to 60.58 mJ/m2, and the polar component surged to 19.96 mJ/m2. MD simulation results indicate that PAE acts as a molecular bridge, significantly reducing interfacial repulsion between the two phases. The interaction energy increased by approximately 35.6% (reaching 324.4 kcal/mol) compared to the unmodified system. The PAE layer uses a unique “side-chain anchoring–main-chain toughening” multiscale dissipation mechanism. As a result, the composite material's mechanical properties have been significantly enhanced. In contrast to the pristine CF/EP, the CF-PAE-1/EP displayed marked superiority in mechanical behavior, specifically achieving 960 MPa in flexural strength (~30% growth), 148.54 kJ/m2 in impact strength (~66.8% growth), and an ILSS of 50.44 MPa.
Keywords:
bio-based sizing
carbon fiber composites
mechanical behavior
RAFT polymerization
toughening of interface
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