A group of shape memory polyurethane‐based nanocomposites containing graphene quantum dot nanoparticles (GQDs) were prepared via in‐situ polymerization method. GQD nanoparticles were synthesized by a facile and rapid microwave‐assisted method and characterized by Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction pattern, field emission scanning microscopy, transmission electron microscopy, and fluorescence analysis. Chemical structure and hydrogen bonding index (HBI_[C=O]) of the nanocomposites were analyzed via FTIR spectra. The results show that the incorporation of GQDs in PU matrix reduces HBI_(C=O) of nanocomposites. Crystalline structure and thermal properties of the nanocomposites were investigated by differential scanning calorimetry. As results indicate, nucleation effect of GQDs raises crystallinity content of the samples. Mechanical examinations indicate that incorporation of GQDs improves Young's modulus of the nanocomposites, while their elongation at break values are reduced. In addition, shape memory analyses reveal that the presence of GQDs in PU matrix increases the shape fixity ratios in nanocomposites.

中文翻译：

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石墨烯量子点（GQD）对热塑性聚氨酯纳米复合材料的光致发光，机械，热和形状记忆性能的影响

通过原位聚合方法制备了一组包含石墨烯量子点纳米粒子（GQD）的形状记忆聚氨酯基纳米复合材料。GQD纳米粒子是通过便捷的微波辅助方法合成的，并通过傅里叶变换红外光谱（FTIR），X射线衍射图，场发射扫描显微镜，透射电子显微镜和荧光分析进行了表征。通过FTIR光谱分析了纳米复合材料的化学结构和氢键指数（HBI _{[C = O]}）。结果表明，在聚氨酯基质中掺入GQD降低了HBI _{（C = O）}纳米复合材料。通过差示扫描量热法研究了纳米复合材料的晶体结构和热性能。结果表明，GQD的成核作用提高了样品的结晶度。机械检查表明，掺入GQD可以提高纳米复合材料的杨氏模量，同时降低其断裂伸长率。此外，形状记忆分析表明，PU基质中GQD的存在增加了纳米复合材料中的形状固定率。