Effect of thermally reduced graphene sheets on the phase behavior, morphology, and electrical conductivity in poly[(α-methyl styrene)-co-(acrylonitrile)/poly(methyl-methacrylate) blends.
Effect of thermally reduced graphene sheets on the phase behavior, morphology, and electrical conductivity in poly[(α-methyl styrene)-co-(acrylonitrile)/poly(methyl-methacrylate) blends.
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DOI：
10.1021/am200669w
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发表时间：
2011-07
影响因子：
9.5
通讯作者：
Giovanni Vleminckx;S. Bose;J. Leys;J. Vermant;M. Wübbenhorst;Ahmed A Abdala;Christopher M. Macosko
中科院分区：
文献类型：
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作者：
Giovanni Vleminckx;S. Bose;J. Leys;J. Vermant;M. Wübbenhorst;Ahmed A Abdala;Christopher M. Macosko
使用熔体流变学、电导率光谱和电子显微镜技术监测热还原石墨烯片 (TRG) 对聚[(α-甲基苯乙烯)-共-(丙烯腈)]/聚(甲基丙烯酸甲酯)共混物中相分离的影响。通过溶液混合将 TRG 掺入单相材料中。然后使复合材料样品原位相分离。当系统通过相图的双节线和旋节线时，通过监测储能模量 (G') 作为温度函数的演变来研究相分离的热力学。通过监测旋节线区域淬火深度处 G' 随时间变化的变化来探测相分离动力学。据观察，TRG 显着影响相分离温度、相图形状和相分离速率。使用电子显微镜和电导率光谱测量来评估 TRG 在共混物中的分散状态。有趣的是，复合材料样品（单相）在室温下实际上是绝缘体，而双相材料中的相分离则获得了高导电材料。
The effects of thermally reduced graphene sheets (TRG) on the phase separation in poly[(α-methyl styrene)-co-(acrylonitrile)]/poly(methyl-methacrylate) blends were monitored using melt rheology, conductivity spectroscopy, and electron microscopic techniques. The TRG were incorporated in the single-phase material by solution mixing. The composite samples were then allowed to phase separate in situ. The thermodynamics of phase separation have been investigated by monitoring the evolution of the storage modulus (G') as a function of temperature as the system passes through the binodal and the spinodal lines of the phase diagram. The phase separation kinetics were probed by monitoring the evolution of G' as a function of time at a quench depth well in the spinodal region. It was observed that TRG significantly influenced the phase separation temperature, the shape of the phase diagram and the rate of phase separation. The state of dispersion of TRG in the blends was assessed using electron microscopy and conductivity spectroscopy measurements. Interestingly, the composite samples (monophasic) were virtually insulators at room temperature, whereas highly conducting materials were obtained as a result of phase separation in the biphasic materials.