This work provides a facile strategy to induce crystallization of polycarbonate (PC) through solvent casting method. Pristine fullerene (C 60 ) and PC-modified C 60 nanoparticles are applied as nucleating agents for PC, and the crystallization behavior of PC nanocomposite films is controlled by solvent casting preparation conditions. To investigate the relationship between crystallization behavior and mechanical properties of PC nanocomposite films, X-ray diffraction, differential scanning calorimetry, polarizing microscope and tensile tests are carried out. Pristine C 60 can only induce the formation of bulk PC spherocrystals which have no help or even deteriorates the mechanical properties of PC/C 60 nanocomposite films. By contrast, the PC-modified C 60 achieves uniformly disperse in the matrix and induces the formation of microcrystalline structures. It is found that appropriate degree of crystallinity for the PC/modified C 60 nanocomposite films can effectively improve the mechanical properties. Typically, the PC/0.50 wt%-modified C 60 nanocomposite films prepared under 40 °C by tetrahydrofuran exhibits up to a 33% increment in tensile strength and 45% increment in Young’s modulus compared to neat PC films.

中文翻译：

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富勒烯诱导结晶改善溶剂浇铸聚碳酸酯薄膜的机械性能

这项工作提供了一种通过溶剂浇铸方法诱导聚碳酸酯 (PC) 结晶的简便策略。原始富勒烯 (C 60 ) 和 PC 改性的 C 60 纳米粒子用作 PC 的成核剂，PC 纳米复合薄膜的结晶行为受溶剂浇铸制备条件的控制。为了研究PC纳米复合薄膜的结晶行为与力学性能之间的关系，进行了X射线衍射、差示扫描量热法、偏光显微镜和拉伸试验。原始的 C 60 只能诱导大块 PC 球晶的形成，这对 PC/C 60 纳米复合薄膜的机械性能没有帮助甚至恶化。相比之下，PC 改性的 C 60 实现了在基体中的均匀分散并诱导了微晶结构的形成。结果表明，适当的PC/改性C 60 纳米复合薄膜的结晶度可以有效提高力学性能。通常，与纯 PC 薄膜相比，由四氢呋喃在 40°C 下制备的 PC/0.50 wt% 改性 C 60 纳米复合薄膜的拉伸强度增加了 33%，杨氏模量增加了 45%。