Synthesis and Characterization of Polypyrrole-Coated Sulfur-Rich Latex Particles: New Synthetic Mimics for Sulfur-Based Micrometeorites

详细信息    查看全文

• 作者：Syuji Fujii ; Steven P. Armes ; Richard Jeans ; Robin Devonshire ; Samantha Warren ; Sally L. McArthur ; Mark J. Burchell ; Frank Postberg ; and Ralf Srama
• 刊名：Chemistry of Materials
• 出版年：2006
• 出版时间：May 30, 2006
• 年：2006
• 卷：18
• 期：11
• 页码：2758 - 2765
• 全文大小：241K
• 年卷期：v.18,no.11(May 30, 2006)
• ISSN：1520-5002

文摘

Polypyrrole (PPy) has been deposited from aqueous solution onto submicrometer-sized sulfur-rich poly[bis(4-vinylthiophenyl)sulfide] (PMPV) latex particles. The PMPV seed particles and resulting compositeparticles were extensively characterized using scanning electron microscopy, X-ray photoelectronspectroscopy, FT-IR spectroscopy, helium pycnometry, Raman spectroscopy, and electrical conductivitymeasurements. Four-point probe measurements on pressed pellets indicate conductivities of around 6 ×10^-5 S cm^-1 for a polypyrrole loading of approximately 11.5%. This suggests a somewhat patchy,nonuniform polypyrrole overlayer, which is consistent with our Raman spectroscopy studies. Despitetheir relatively low conductivities, these polypyrrole-coated PMPV latexes can be accelerated up tohypervelocities (>20 km s^-1) using a high voltage (2 MV) van de Graaf instrument. In view of theirhigh sulfur contents (ca. 28%), these new electrically conductive latexes are expected to be interestingsynthetic mimics for understanding the behavior of sulfur-based micrometeorites, whose existence hasbeen postulated by planetary scientists investigating signs of volcanic activity on one of Jupiter's moons(Io).