Resveratrol-Derived Liquid Crystal Epoxy Resin with Low-Dielectric Properties and Excellent Mechanical Strength and Toughness AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01565

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The application of ordinary epoxy resins is severely limited by their poor dielectric properties and toughness, and the increasing focus on sustainability calls for raw materials to be renewable. Thus, a resveratrol-based compound (AE-Res) with three active ester structures was prepared and used to cure glycidyl ethers of bisphenol A (DGEBA) and a liquid crystal epoxy monomer (BPDGE). Test results showed that the combination (AE-Res/BPDGE) of resveratrol derivatives with liquid crystal epoxy monomers exhibited an excellent comprehensive performance. The mechanical strength and toughness of AE-Res/BPDGE were improved. Specifically, the tensile strength, elongation at break, flexural strength, and impact strength of AE-Res/BPDGE were 108.45 MPa, 12.31%, 159.92 MPa, and 39.51 kJ/m2, which were 48.14, 164.16, 92.51, and 143.74% higher than that of BPDGE cured by commercial methylhexahydrophthalic anhydride (MHHPA), respectively. This can be attributed to the introduction of a rigid structure and flexible ether bonds generated after curing. Meanwhile, the dielectric constant (Dk) of AE-Res/BPDGE decreased from 3.81 to 3.00 (10 MHz) compared to MHHPA/BPDGE, mainly owing to the enhanced d-spacing (4.69 vs 4.45 Å) and the absence of highly polar hydroxyl groups. In addition, AE-Res/BPDGE also exhibited good thermal stability and hydrophobicity with a T5% of 383.22 °C, a water contact angle of 110°, and a water absorption of 0.15% because of the presence of a rigid conjugated stilbene and biphenyl structure. Due to its ease of synthesis and environmental friendliness, AE-Res could be a satisfactory alternative to commercial epoxy curing agents.