Stacking of Main Chain-Crown Ether Polymers in Thin Films

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• 作者：Daniel R. Rueda ; Aurora Nogales ; Jaime J. Hern&aacute ; ndez ; Mari-Cruz Garcí ; a-Gutié ; rrez ; Tiberio A. Ezquerra ; Stephan V. Roth ; Mikhail G. Zolotukhin ; Rosalí ; a Serna
• 刊名：Langmuir
• 出版年：2007
• 出版时间：December 4, 2007
• 年：2007
• 卷：23
• 期：25
• 页码：12677 - 12681
• 全文大小：275K
• 年卷期：v.23,no.25(December 4, 2007)
• ISSN：1520-5827

文摘

Thin films (9-70 nm) of a series of polymers containing in the main chain dibenzo-18-crown-6 ether unit (DB18C6)linked to an aliphatic spacer of different length (10C and 14C) and nature have been prepared, from chloroformsolutions, by spin coating on a silicon substrate. The quality and homogeneity of the polymer coatings was revealedby their reflectivity spectra and atomic force microscopy (AFM). The grazing incidence small-angle X-ray scattering(GISAXS) patterns show an out-of-plane structure correlation (interference maximum near the horizon) of scale sizerelated to the polymer repeating unit length. Above this Bragg reflection, the shape of the scattering observed, in theGISAXS pattern, reveals an orientation of the stacked molecular columns in the coated polymer. A thermal treatmentof the samples improves the nanostructure by increasing the lamellar coherence size (in y-direction) as well as thevertical orientation of the molecular columns.