Characterization of the Layered Structure in Main Chain Dibenzo-18-crown-6 Ether Polymers by Simultaneous WAXS/MAXS-SAXS/DSC Measurements
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- 作者：Aurora Nogales ; Daniel R. Rueda ; Alejandro Sanz ; Mari-Cruz Garcí ; a-Gutié ; rrez ; Tiberio A. Ezquerra ; Mikhail G. Zolotukhin ; M. del Carmen G. Herná ; ndez ; Sergei Fomine ; Howard M. Colquh
- 刊名：Macromolecules
- 出版年：2007
- 出版时间：May 1, 2007
- 年：2007
- 卷：40
- 期：9
- 页码：3355 - 3360
- 全文大小：429K
- 年卷期：v.40,no.9(May 1, 2007)
- ISSN：1520-5835
文摘
The structure and thermal properties of polymers containing dibenzo-18-crown-6 ether units inthe main chain linked to an aliphatic spacer of different lengths (C10-C14) is reported. X-ray diffraction patternsof all the studied samples exhibit a peak in the medium angle region, revealing the existence of a lamellar structure.Simultaneous calorimetry and small, medium (SAXS-MAXS) and wide (WAXS) X-ray measurements duringcooling and subsequent heating of the samples reveal that a layer phase is formed upon cooling. In the case ofthe homopolymers, this phase is almost simultaneously accompanied by the appearance of some reflections inthe wide angle region as an indication of lateral crystallization. However, by copolymerization, the formation ofthe layer phase is decoupled from lateral crystallization, being stable in a wide temperature region.