The ring-opening polymerization of cyclic butylene terephthalate into poly(butylene terephthalate) (pCBT) in the presence of reduced graphene oxide (RGO) is an effective method for the preparation of polymer nanocomposites. The inclusion of RGO nanoflakes dramatically affects the crystallization of pCBT, shifting crystallization peak temperature to higher temperatures and, overall, increasing the crystallization rate. This was due to a supernucleating effect caused by RGO, which is maximized by highly reduced graphene oxide. Furthermore, combined analyses by differential scanning calorimetry (DSC) experiments and wide-angle X-ray diffraction (WAXS) showed the formation of a thick α-crystalline form pCBT lamellae with a melting point of ∼250 °C, close to the equilibrium melting temperature of pCBT. WAXS also demonstrated the pair orientation of pCBT crystals with RGO nanoflakes, indicating a strong interfacial interaction between the aromatic rings of pCBT and RGO planes, especially with highly reduced graphene oxide.

中文翻译：

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含高还原氧化石墨烯的纳米复合材料中聚对苯二甲酸丁二醇酯晶体的超核和取向

在还原氧化石墨烯（RGO）存在下，环对苯二甲酸丁二醇酯开环聚合为聚对苯二甲酸丁二醇酯（pCBT）是制备聚合物纳米复合材料的有效方法。包含RGO纳米薄片会极大地影响pCBT的结晶，将结晶峰温度转移到更高的温度，并总体上提高了结晶速率。这是由于RGO产生的超核效应，而高度还原的氧化石墨烯可最大程度地发挥这种效应。此外，通过差示扫描量热法（DSC）实验和广角X射线衍射（WAXS）进行的组合分析显示，形成了厚厚的α晶形pCBT薄片，熔点约为250°C，接近平衡熔融pCBT的温度。