Influence of ultrasonic treatment in PP/CNT composites using masterbatch dilution method
Influence of ultrasonic treatment in PP/CNT composites using masterbatch dilution method
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DOI：
10.1016/j.polymer.2014.02.014
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发表时间：
2014-04
期刊：
影响因子：
4.6
通讯作者：
J. Zhong;A. Isayev;Keyuan Huang
中科院分区：
文献类型：
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作者：
J. Zhong;A. Isayev;Keyuan Huang
采用双螺杆挤出机直接复合法制备了不同浓度的多壁碳纳米管（CNTs）填充聚丙烯（PP）复合材料。此外，在没有超声波处理和有超声波处理的情况下，制备了20 wt% PP/CNT复合材料的母粒，并将其稀释到与没有超声波处理的直流方法相同的浓度。这被称为母粒稀释（MD）法。研究了其流变性能、电学性能和力学性能。用光学显微镜测定了微分散体的工艺、性质和结构。结果表明，MD法比DC法在PP基体中具有更好的分散效果。储存模量、粘度、电学和机械性能的增加表明了这一点。通过将流变学数据拟合到标度模型中，确定碳纳米管的分形维数D和碳纳米管网络的骨架分形维数x。MD法制备的复合材料碳纳米管分形维数较低，骨架分形维数较高，与DC法制备的复合材料相比，分散性较好。此外，在MD法中应用振幅为13 μm的超声波处理时，获得了较低的d值和较高的x值，并对形貌和力学性能产生了良好的影响，表明超声波处理在制备PP/CNT母粒方面具有优势。
Composites of polypropylene (PP) filled with multiwalled carbon nanotubes (CNTs) of various concentrations were prepared by a twin screw extruder using direct compounding (DC) method without and with ultrasonic treatment. In addition, a masterbatch of 20 wt% PP/CNT composites were prepared without and with ultrasonic treatment and diluted to the same concentrations as in the DC method without ultrasonic treatment. This is called the masterbatch dilution (MD) method. The rheological, electrical and mechanical properties were investigated. The microdispersion was determined using optical microscopy to correlate the processing, properties and structure. It was shown that the MD method provided better dispersion of CNT in PP matrix than the DC method. This was indicated by an increase of the storage modulus, viscosity, electrical and mechanical properties. The fractal dimension of CNTs,D, and the backbone fractal dimension,x, of the CNT network were determined by fitting the rheological data to the scaling model. The lower fractal dimension of CNT and higher backbone fractal dimension of CNT network in composites prepared by the MD method compared with composites obtained by the DC method indicated a better dispersion. Additionally, a lowerDand a higherxvalues as well as the favorable effect on the morphology and mechanical properties were achieved when the ultrasonic treatment at an amplitude of 13 μm was applied in the MD method, indicating an advantage in use of the ultrasonic treatment in preparing the PP/CNT masterbatch.