Journal of chemical engineering and chemistry research最新文献

英文中文

Improved Thermal and Electrical Properties of Nanocomposites Based on Poly(vinyl pyrrolidone)/Poly(acrylonitrile)/Multiwalled Carbon Nanotubes. 聚乙烯基吡咯烷酮/聚丙烯腈/多壁碳纳米管纳米复合材料的热电性能

Journal of chemical engineering and chemistry research

Pub Date : 2015-09-01 Epub Date: 2015-09-25

Salem M Aqeel, Omar Al-Shuja'a, Zhongyuan Huang, Carolyn Le, Yan Zhang, Zhe Wang

Poly(vinyl pyrrolidone)/Poly(acrylonitrile)/multi-walled carbon nanotubes composites (PVP/PAN/MWNTs) were fabricated by a simple solution cast technique with a wide composition range from 0 to 3.12 wt% of MWNTs. The nanocomposites were characterized by fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). A percolated MWNTs network structure and relatively good dispersion of MWNTs are evident in PVP/PAN/MWNTs nanocomposites with 3.12 wt% of MWNTs. The thermal properties of the polymer blend with MWNTs were carried out by means of different scanning calorimetry (DSC). It indicated that the incorporation of MWNTs had a significant influence on crystallization and melting behaviors for the polymer nanocomposites. The four point probe method was used to measure the electrical conductivity, and the result showed ionic conductivity of the order of 2.87 × 10^-4 S/cm to 1.91 × 10^-2 S/cm. The effect of the concentration of the filler on the conductivity of the polymer nanocomposite was discussed. Nanocomposites based on PVP/PAN and MWNTs as filler show a significant enhancement in the electrical conductivity as a function of temperature. The low percolation threshold in PVP/PAN/MWNTs nanocomposites was explained by high aspect ratio of the nanotubes and their distribution inside the polymer blend.

采用简单的溶液铸造技术制备了聚乙烯吡咯烷酮/聚丙烯腈/多壁碳纳米管复合材料(PVP/PAN/MWNTs)， MWNTs的组成范围为0 ~ 3.12 wt%。采用傅里叶变换红外光谱(FT-IR)和扫描电镜(SEM)对纳米复合材料进行了表征。PVP/PAN/MWNTs纳米复合材料中MWNTs的渗透率为3.12 wt%，具有较好的分散性。采用不同扫描量热法(DSC)研究了纳米碳管共混聚合物的热性能。结果表明，纳米碳纳米管的掺入对聚合物纳米复合材料的结晶和熔融行为有显著影响。采用四点探针法测定其电导率，结果表明离子电导率为2.87 × 10-4 S/cm ~ 1.91 × 10-2 S/cm。讨论了填料浓度对聚合物纳米复合材料电导率的影响。以PVP/PAN和MWNTs为填料的纳米复合材料的电导率随温度的变化而显著提高。PVP/PAN/MWNTs纳米复合材料的低渗透阈值是由于纳米管的高长径比及其在聚合物共混物中的分布。

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