The nanocomposites based on poly(n-butyl acrylate)-grafted magnetic Fe₃O₄ nanoparticles were synthesized via surface reversible addition-fragmentation chain transfer (RAFT) polymerization approach. To promote the supramolecular hydrogen bonding interactions, 2-ureido-4[1H]-pyrimidinone methyl methacrylate (UPyMA) was used as a copolymerization monomer and introduced into the nanocomposites. Transmission electron microscopy (TEM) showed that the Fe₃O₄ nanoparticles (NPs) were finely dispersed in the polymer matrix. The magnetic analysis showed that the nanocomposites displayed superparamagnetic properties. After the supramolecular quadruple hydrogen bonding interactions were introduced, the nanocomposites displayed the improved thermomechanical properties as evidenced by the enhanced glass transition temperatures (T_g's), Young's modulus and ultimate tensile mechanical strength compared to the unmodified nanocomposites. Most importantly, the nanocomposites were newly endued with the thermally-induced shape memory properties, which can alternatively triggered by the use of the photothermal effect of Fe₃O₄ nanoparticles. It was found that the rates of shape recovery were increased with the content of the quadruple hydrogen bonding motif. The introduction of the supramolecular hydrogen bonding motif (viz. 2-ureido-4[1H]-pyrimidinone, UPy) imparted the self-healing properties to the nanocomposites via the intense dynamic exchange of hydrogen bonds. The self-healing process can be accelerated by increasing the content of the hydrogen bonding motif.

通过表面可逆加成-断裂链转移（RAFT）聚合方法合成了基于聚（丙烯酸正丁酯）接枝磁性Fe ₃ O ₄纳米粒子的纳米复合材料。为了促进超分子氢键相互作用，将2-脲基-4 [1H]-嘧啶酮甲基丙烯酸甲酯（UPyMA）用作共聚单体并引入到纳米复合材料中。透射电子显微镜（TEM）表明Fe ₃ O ₄纳米颗粒（NPs）精细地分散在聚合物基质中。磁性分析表明，纳米复合材料具有超顺磁性。引入超分子四重氢键相互作用后，纳米复合材料显示出改善的热机械性能，与未改性的纳米复合材料相比，玻璃化转变温度（T _g），杨氏模量和极限拉伸机械强度提高。最重要的是，纳米复合材料被赋予了新的热诱导形状记忆特性，这可以通过使用Fe ₃ O ₄的光热效应来触发。纳米粒子。发现随着四重氢键基序的含量，形状恢复的速率增加。超分子氢键基序（即2-ureido-4 [1H]-嘧啶酮，UPy）的引入通过氢键的剧烈动态交换赋予了纳米复合材料自修复性能。可以通过增加氢键基序的含量来加速自愈过程。