Thermo-Active Behavior of Ethylene-Vinyl Acetate | Multiwall Carbon Nanotube Composites Examined by in Situ near-Edge X-ray Absorption Fine-Structure Spectroscopy

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• 作者：A. Douglas Winter ; Eduardo Larios ; Faisal M. Alamgir ; Cherno Jaye ; Daniel A. Fischer ; Mária Omastová ; Eva M. Campo
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：February 20, 2014
• 年：2014
• 卷：118
• 期：7
• 页码：3733-3741
• 全文大小：427K
• ISSN：1932-7455

文摘

NEXAFS spectroscopy was used to investigate the temperature dependence of thermally active ethylene-vinyl acetate | multiwall carbon nanotube (EVA|MWCNT) films. The data shows systematic variations of intensities with increasing temperature. Molecular orbital assignment of interplaying intensities identified the 1s 鈫?蟺*_C鈺怌 and 1s 鈫?蟺*_C鈺怬 transitions as the main actors during temperature variation. Furthermore, enhanced near-edge interplay was observed in prestrained composites. Because macroscopic observations confirmed enhanced thermal-mechanical actuation in prestrained composites, our findings suggest that the interplay of C鈺怌 and C鈺怬 蟺 orbitals may be instrumental to actuation.