Poly(amic acid), the precursor of polyimide (PI), was used for the preparation of PI/CeO₂ nanocomposites (NC)s by ultrasonic assisted technique via insertion of the surface modified CeO₂ nanoparticles (NP)s into PI matrix. In the preparation stages, in the first, the modifications of CeO₂ NPs by using hexadecyltrimethoxysilane (HDTMS) as a binder were targeted using ultrasonic waves. In the second step, newly designed PI structure was formed from the sonochemical imidization process as a molecular hook. In this step two different reactions were occurred. The acetic acid elimination reaction in the main chain of macromolecule, and the acetylation reaction in the side chains of poly(amic acid) were accomplished. By acetylation process the hook structure was created for trapping of the modified nanoparticles. In the final step the preparation of PI NCs were achieved by sonochemical process. The structural and thermal properties of pure PI and PI/CeO₂ NCs were studied by several techniques such as fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and thermal analyses. FT-IR and ¹H-NMR spectra confirmed the success in preparation of PI matrix. The FE-SEM, TEM, and AFM analyses showed the uniform distribution of CeO₂ NPs in PI matrix. The XRD patterns of NCs show the presence of crystalline CeO₂ NPs in amorphous PI matrix. The thermal analysis results reveal that, with increases in the content of CeO₂ NPs in PI matrix, the thermally stability factors of samples were improved.

通过将表面改性的CeO ₂纳米颗粒（NP）插入到PI基质中，通过超声辅助技术，使用聚酰亚胺（PI）的前体聚（酰胺酸）制备PI / CeO ₂纳米复合材料（NC）。在准备阶段，首先是对CeO ₂的改性使用超声波靶向通过使用十六烷基三甲氧基硅烷（HDTMS）作为粘合剂的NP。在第二步中，通过声化学酰亚胺化过程形成了新设计的PI结构作为分子钩。在这一步骤中，发生了两种不同的反应。完成了大分子主链中的乙酸消除反应和聚酰胺酸侧链中的乙酰化反应。通过乙酰化过程，产生了钩结构，用于捕获改性的纳米颗粒。在最后一步中，通过声化学过程完成了PI NC的制备。纯PI和PI / CeO ₂的结构和热学性质通过多种技术对NC进行了研究，例如傅立叶变换红外光谱（FT-IR），核磁共振光谱（NMR），场发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM），原子力显微镜（AFM） ，X射线衍射（XRD）和热分析。FT-IR和¹ H-NMR光谱证实了PI基质的制备成功。FE-SEM，TEM和AFM分析表明，CeO ₂ NP在PI基质中分布均匀。NC的X射线衍射图谱表明，非晶态PI基质中存在结晶CeO ₂ NP。热分析结果表明，随着PI基质中CeO ₂ NPs含量的增加，样品的热稳定性因子得到改善。