In this study, WPU@SiO₂ nanoparticles were obtained by grafting waterborne polyurethane (WPU) on the surface of silicon dioxide (SiO₂). Then, WPU@SiO₂ nanoparticles were introduced into the matrix of polybutylene succinate (PBS) to prepare a series of PBS/WPU@SiO₂ composites. The dispersibility and interfacial compatibility of filler and matrix can be improved obviously by grafting a layer of WPU onto the surface of SiO₂ nanoparticles. The FTIR and TGA results showed that WPU was successfully grafted onto the surface of SiO₂. According to polarizing microscope images, it is clear that the size of the pure PBS crystals is much larger than that of the PBS/WPU@SiO₂, and a large number of crystals are evenly distributed in the PBS/WPU@SiO₂ composite. In addition, DSC and TGA results indicated that PBS/WPU@SiO₂ composite films show excellent thermal properties. Meanwhile, the initial thermal decomposition temperature of PBS/WPU@SiO₂ composite films is about 366–374°C. For the 10 wt% WPU@SiO₂ reinforced PBS-based composite films, the tensile strength reached the ultimate value (38.49 MPa), which is 32.04% higher than that of pure PBS. Based on its excellent mechanical and thermal properties, the PBS/WPU@SiO₂ composites have a broad application prospect in the field of biodegradable materials.

中文翻译：

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SiO2颗粒表面改性对PBS复合材料界面和力学性能的影响

本研究通过在二氧化硅（SiO _{2 ）表面接枝水性聚氨酯（WPU）获得WPU@SiO 2}纳米颗粒。然后，将WPU@SiO ₂纳米颗粒引入聚丁二酸丁二醇酯（PBS）基体中，制备了一系列PBS/WPU@SiO ₂复合材料。_{在SiO 2}纳米粒子表面接枝一层WPU可以明显提高填料与基体的分散性和界面相容性。FTIR和TGA结果表明WPU成功接枝到SiO ₂表面。根据偏光显微镜图像，很明显纯 PBS 晶体的尺寸远大于 PBS/WPU@SiO _{2的尺寸。}, 大量晶体均匀分布在 PBS/WPU@SiO ₂复合材料中。此外，DSC和TGA结果表明，PBS/WPU@SiO ₂复合薄膜表现出优异的热性能。同时，PBS/WPU@SiO ₂复合薄膜的初始热分解温度约为366-374℃。10 wt% WPU@SiO ₂增强的PBS基复合薄膜的抗拉强度达到极限值（38.49 MPa），比纯PBS高32.04%。_{PBS/WPU@SiO 2}复合材料基于其优异的力学和热学性能，在生物降解材料领域具有广阔的应用前景。