Effect of Polyvinyl Alcohol on the Growth, Structure, Morphology, and Electrical Conductivity of Polypyrrole Nanoparticles Synthesized via Microemulsion Polymerization
Effect of Polyvinyl Alcohol on the Growth, Structure, Morphology, and Electrical Conductivity of Polypyrrole Nanoparticles Synthesized via Microemulsion Polymerization
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聚乙烯醇对微乳液聚合法合成聚吡咯纳米粒子生长、结构、形貌和电导率的影响
DOI：
10.5402/2012/809063
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Singh
中科院分区：
文献类型：
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作者：
Anurag Krishna;Amit Kumar;R. Singh
以十二烷基硫酸钠为表面活性剂，采用微乳液聚合技术合成了聚吡咯(PPy)纳米粒子。在聚合过程中加入聚乙烯醇(PVA)作为软模板，对PPy纳米粒子的结构和性能进行了改性。用傅立叶变换红外光谱(FT-IR)、X射线衍射仪(X射线衍射仪)、扫描电子显微镜(SEM)和直流电导率测试仪对不加PVA和添加PVA的材料进行了表征。FT-IR研究表明，在PVA存在下合成的样品具有较长的共轭长度。直流电导率随温度的变化曲线表明，聚乙烯醇对聚吡咯的聚合机理有很强的影响，证明了聚合过程中氢键的辅助作用，从而合成了较好的有序聚合物。提出了一种生长机制，解释了PPy聚合的氢键辅助作用导致了结构有序性的增强。
Polypyrrole (PPy) nanoparticles were synthesized via microemulsion polymerization technique using sodium dodecyl sulfate as surfactant. Polyvinyl alcohol (PVA) was added as soft template during polymerization to modify the structure and properties of PPy nanoparticles. The synthesized materials namely, PVA-free and PVA added were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and DC electrical conductivity measurements. The sample synthesized in the presence of PVA has longer conjugation length as estimated from FT-IR investigation. Temperature dependence (4.2–300 K) of DC electrical conductivity measurement reveals that the PVA has a strong effect on the polymerization mechanism of PPy giving evidence of H-bonded assistance during polymerization leading to the synthesis of better ordered polymer. A growth mechanism has been proposed which explains the H-bonded assistance of PPy polymerization leading to enhanced structural ordering.