Abstract Phenol formaldehyde (PF) resin capsules containing dicyclopentadiene (DCPD) as core materials are rationally designed and fabricated. The synthesis consists of preparation of polystyrene (PS) sphere, PF coating on PS sphere, followed by removal of PS core, amination modification and importing of DCPD. Solution phase switchable transport trough PF shell layer is key for the synthesis of DCDP@PF capsules. The resultant DCDP@PF capsules have a diameter of ∼500 nm, shell thickness of ∼50 nm, and core content of ∼45 wt%. The results show that DCDP@PF capsules have outstanding thermal stability with initial evaporation temperature (defined at 5% of weight loss), increased by ∼30 °C compared with that of pure DCPD, and good resistance to acetone. Preliminary results indicated that the prepared DCPD@PF capsules can effectively improve the mechanical properties of epoxy matrix as well as impart it self-healing properties. When 15 wt% DCPD@PF capsules were introduced into epoxy matrix, 81.4% increment in fracture toughness, 26.6% increment in tensiles strength and 91.8% recovery in fracture toughness can be obtained. This work provides a new insight into the investigation of the fabrication of self-healing capsules.

中文翻译：

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自愈胶囊合成新策略及其应用

摘要 以双环戊二烯（DCPD）为核心材料的酚醛（PF）树脂胶囊经过合理设计和制备。合成包括制备聚苯乙烯（PS）球，在PS球上涂上PF，然后去除PS核，胺化改性和导入DCPD。溶液相可切换传输槽 PF 壳层是合成 DCDP@PF 胶囊的关键。所得 DCDP@PF 胶囊的直径约为 500 nm，壳厚度约为 50 nm，核心含量约为 45 wt%。结果表明，DCDP@PF 胶囊在初始蒸发温度（定义为重量损失的 5%）下具有出色的热稳定性，与纯 DCPD 相比提高了约 30°C，并且具有良好的耐丙酮性。初步结果表明，制备的 DCPD@PF 胶囊可以有效提高环氧树脂基体的力学性能并赋予其自修复性能。当 15 wt% DCPD@PF 胶囊被引入环氧树脂基体时，断裂韧性增加 81.4%，拉伸强度增加 26.6%，断裂韧性恢复 91.8%。这项工作为研究自修复胶囊的制造提供了新的见解。