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首页> 外文期刊>Journal of Applied Polymer Science >Morphology and electrical properties of polymethylmethacrylate/ poly(styrene-co-acrylonitrile)/multi-walled carbon nanotube nanocomposites
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Morphology and electrical properties of polymethylmethacrylate/ poly(styrene-co-acrylonitrile)/multi-walled carbon nanotube nanocomposites

机译：聚甲基丙烯酸甲酯/聚苯乙烯-丙烯腈/多壁碳纳米管纳米复合材料的形貌和电性能

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摘要

Nanocomposites of blends of polymethylmethacrylate (PMMA) and poly(styrene-co-acrylonitrile) (SAN) with multi-walled carbon nanotubes (MWCNTs) were prepared by melt mixing in a twin-screw extruder. The dispersion state of MWCNTs in the matrix polymers was investigated using transmission electron microscopy. Interestingly enough, in most of the nanocomposites, the MWCNTs were observed to be mainly located at SAN domains, regardless of the SAN compositions in the PMMA/SAN blend and of the processing method. One possible reason for this morphology may be the π-π interactions between MWCNTs and the phenyl ring of SAN. The shift in G-band peak observed in the Raman spectroscopy may be the indirect evidence proving these interactions. The percolation threshold for electrical conductivity of PMMA/SAN/MWCNT nanocomposites was observed to be around 1.5 wt %. Nanocomposites with PMMA-rich composition showed higher electrical conductivity than SAN-rich nanocomposites at a fixed MWCNT loading. The dielectric constant measurement also showed composition-dependent behavior.
机译：通过在双螺杆挤出机中熔融混合，制备了聚甲基丙烯酸甲酯（PMMA）和聚（苯乙烯-丙烯腈）（SAN）与多壁碳纳米管（MWCNT）的共混物的纳米复合材料。使用透射电子显微镜研究了MWCNT在基体聚合物中的分散状态。有趣的是，在大多数纳米复合材料中，无论PMMA / SAN共混物中的SAN组成和加工方法如何，MWCNTs都主要位于SAN域。这种形态的一个可能原因可能是MWCNT与SAN的苯环之间的π-π相互作用。拉曼光谱中观察到的G谱带峰移动可能是证明这些相互作用的间接证据。观察到PMMA / SAN / MWCNT纳米复合材料的电导率的渗透阈值为约1.5重量％。在固定的MWCNT负载下，具有富含PMMA的纳米复合材料比具有SAN的纳米复合材料具有更高的电导率。介电常数测量还显示出成分依赖性的行为。

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