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首页> 外文期刊>Journal of Applied Polymer Science >Polymerization of N-vinylcarbazole (NVC) by tungsten blues (WB) and evaluation of a conducting PNVC-WB nanocomposite isolated from the system
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Polymerization of N-vinylcarbazole (NVC) by tungsten blues (WB) and evaluation of a conducting PNVC-WB nanocomposite isolated from the system

机译：钨蓝（WB）聚合N-乙烯基咔唑（NVC）并评估从系统中分离的导电PNVC-WB纳米复合材料

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摘要

Tungsten oxide and tungsten blues (WB) prepared by reducing the former with stannous chloride were capable of initiating the bulk polymerization of Nvinylcarbazole (NVC) at the melting temperature of the latter (65°C). The polymerizations were initiated by a η~2-type of complex formation involving p-clouds of vinyl group and the available d-orbitals of W~(6+) ions. A composite of PNVC with WB was isolated and characterized. Formation of PNVC and its incorporation in the composite was confirmed by FTIR, NMR, and UV absorption spectroscopic studies. Scanning electron micrographic analyses of PNVC-WB composite revealed the presence of close packed aggregates comprising particles of average sizes between 100-200nm range. TGA revealed the thermogravimmetric stability trend as WB > PNVC-WB > PNVC. Dc conductivities of PNVCWB nanocomposite were found to depend on the WB : PNVC weight ratio in the composite and varied from 3.5 × 10~(-4) (weight ratio 26) to 3 × 10~(-2) S/cm (weight ratio 100) at room temperature. The threshold WB : PNVC weight ratio for the manifestation of conductivity in the composite was around 25 under the experimental condition of this study.
机译：通过用氯化亚锡还原前者而制备的氧化钨和钨蓝（WB）能够在后者的熔化温度（65°C）下引发乙烯基咔唑（NVC）的本体聚合。聚合反应是由η〜2型络合物形成引发的，该络合物包括乙烯基的p云和可用的W〜（6+）离子的d轨道。分离并表征了PNVC与WB的复合材料。通过FTIR，NMR和UV吸收光谱研究证实了PNVC的形成及其在复合材料中的结合。 PNVC-WB复合材料的扫描电子显微分析表明，存在紧密堆积的聚集体，该聚集体包含平均粒径在100-200nm范围内的颗粒。 TGA揭示了热重量稳定趋势，即WB> PNVC-WB> PNVC。发现PNVCWB纳米复合材料的Dc电导率取决于复合物中WB：PNVC的重量比，从3.5×10〜（-4）（重量比26）到3×10〜（-2）S / cm（重量比）变化100）在室温下。在本研究的实验条件下，复合材料中导电性表现的阈值WB：PNVC重量比约为25。

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