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首页> 外文期刊>Journal of Applied Polymer Science >Morphological features and crystallization behavior of the conductive composites of poly(trimethylene terephthalate)/graphene nanosheets
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Morphological features and crystallization behavior of the conductive composites of poly(trimethylene terephthalate)/graphene nanosheets

机译：聚对苯二甲酸丙二醇酯/石墨烯纳米片导电复合材料的形貌特征和结晶行为

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摘要

Poly(trimethylene terephthalate) (PTT) composites filled with well-dispersed graphene nanosheets (GNSs) were prepared through a coagulation method. The effects of increased GNS concentration on variations in the structure and properties of the PTT matrix, such as its electrical conductivity, crystallization kinetics, melting behavior, and crystal morphology, were investigated. Several analytical techniques were used, including electrical conductivity measurement, differential scanning calorimetry, Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, polarized light microscopy, transmission electron microscopy (TEM), and thermo-gravimetric analysis (TGA). Electrical conductivity increased from 1.8 x 10(-17) S/cm for neat PTT to 0.33 +/- 0.23 S/cm for PTT/GNS composites with 2.97 vol % GNS content. Percolation scaling laws were applied, and then threshold concentration and exponent were determined. In the case wherein liquid nitrogen was used to quench the melt, a mesomorphic phase was formed despite the extremely short crystallization time after adding high GNS contents. PTT crystallization rate increased with the gradual addition of GNSs. The enhanced crystallization kinetics was attributed to the high nucleation ability of GNSs to induce epitaxially grown lamellae on their surfaces, as revealed by TEM. PTT nuclei were randomly developed on the GNS surface to form the lamellae. However, crystallinity reached its maximum value near the electrical percolation threshold because the PTT chain mobility was confined after the GNS-GNS network formed. The growth of PTT banded spherulites in the bulk was still observed for composites with high GNS content, and TGA results revealed that the GNS-filled PTT composites had excellent thermal stability. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43419.
机译：通过凝固法制备了填充有分散良好的石墨烯纳米片（GNS）的聚对苯二甲酸丙二醇酯（PTT）复合材料。研究了GNS浓度增加对PTT基质的结构和性质变化的影响，例如其电导率，结晶动力学，熔融行为和晶体形态。使用了几种分析技术，包括电导率测量，差示扫描量热法，傅里叶变换红外光谱，广角X射线衍射，偏振光显微镜，透射电子显微镜（TEM）和热重分析（TGA）。导电率从纯PTT的1.8 x 10（-17）S / cm增加到GNS含量为2.97％的PTT / GNS复合材料的0.33 +/- 0.23 S / cm。应用渗流定标定律，然后确定阈值浓度和指数。在使用液氮淬火熔体的情况下，尽管在添加高的GNS含量后结晶时间非常短，但仍形成了介晶相。随着GNS的逐渐添加，PTT的结晶速率增加。 TEM显示，结晶动力学的增强归因于GNS在其表面上诱导外延生长的薄片的高成核能力。 PTT核随机分布在GNS表面上，形成薄片。但是，结晶度在电渗流阈值附近达到最大值，这是因为PTT链迁移率在GNS-GNS网络形成后受到限制。对于GNS含量高的复合材料，仍观察到PTT带状球晶在整体中的生长，TGA结果表明，GNS填充的PTT复合材料具有出色的热稳定性。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43419。

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