Conformational chirality of the biphenyl groups induced by the aggregation of poly{bis[4-(4’-(S)-2-methylbutoxy)-biphenoxy] phosphazene}
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- 作者：Xianhui Tang 唐贤慧 ; Baozong Li ; Yi Li 李艺…
- 关键词：polyphosphazene ; biphenyl ; chirality ; aggregates
- 刊名：Journal of Wuhan University of Technology--Materials Science Edition
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：31
- 期：5
- 页码：1162-1166
- 全文大小：804 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Chinese Library of Science - 出版者：Wuhan University, co-published with Springer
- ISSN：1993-0437
- 卷排序：31
文摘
Poly{bis[4-(4’-(S)-2-methylbutoxy)biphenyloxy]phosphazene}(PP-C) was designed and successfully synthesized, and then characterized by means of FT-IR spectroscopy, 1H- and 31P-NMR, GPC spectroscopy, wide angle X-ray diffraction and differential scanning calorimetry. The results indicated that for PP-C, the Mw is 2.18×105 and the PDI is 1.96. PP-C was a kind of crystallized polymer with a crystallizing point of -2.0 °C and a melting point of 28 °C. The conformational chirality of the PP-C molecules was studied using circular dichroism spectrum. It was found that in dilute THF solution, the biphenyl groups in the PP-C molecules twisted randomly. However, when the PP-C formed aggregates, the biphenyl groups tended to twist single-handedly, which was controlled by the adjacent chiral alkoxy groups.