Abstract Nanodiamond (ND) was surface modified by polyethylene glycol (PEG) to improve the interfacial adhesion between ND and the polylactic acid (PLA) matrix and achieve uniform nanoparticle dispersion in the matrix. PEG functionalized ND (ND-PEG) was successfully prepared by a novel and scalable modification method. Firstly, the ND particles oxidized by air was treated with dopamine, and then the hydroxyl groups on PEG and polydopamine (PDA) were covalently linked by isocyanate groups. The Fourier Transform Infrared spectroscopy, Thermogravimetric analysis and X-ray photoelectron spectroscopy reveal that PEG has been covalently boned on the surface of ND. Compared with those of pure PLA film, the tensile strength, tensile modulus and elongation at break of the nanocomposite films with PEG modified ND increase by 66.64%, 37.6% and 187.43%, respectively. In the meantime, the degradation temperature at the initial stage and the temperature at the maximum weight loss rate of the nanocomposite films are significantly increased. It is suggested that the incorporation of ND-PEG into PLA matrix is an effective method to improve the mechanical properties and thermal stability of PLA.

中文翻译：

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聚乙二醇表面改性纳米金刚石对聚乳酸纳米复合薄膜性能的影响

摘要 通过聚乙二醇(PEG)对纳米金刚石(ND)进行表面改性，以提高ND与聚乳酸(PLA)基体的界面附着力，实现纳米颗粒在基体中的均匀分散。PEG 功能化的 ND（ND-PEG）是通过一种新颖的、可扩展的修饰方法成功制备的。首先将被空气氧化的ND颗粒用多巴胺处理，然后PEG和聚多巴胺（PDA）上的羟基通过异氰酸酯基团共价连接。傅里叶变换红外光谱、热重分析和 X 射线光电子能谱表明 PEG 已共价键合在 ND 表面。与纯PLA薄膜相比，PEG改性ND纳米复合薄膜的拉伸强度、拉伸模量和断裂伸长率分别提高了66.64%、37.6%和187.43%，分别。同时，纳米复合薄膜的初始降解温度和最大失重率温度显着升高。表明将 ND-PEG 掺入 PLA 基质中是提高 PLA 力学性能和热稳定性的有效方法。