Aggregation of Hydrophobic Substituents of Poly(acrylate)s and Their Competitive Complexation by 尾- and 纬-Cyclodextrins and Their Linked Dimers in Aqueous Solution

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• 作者：Jie Wang ; Li Li ; Xuhong Guo ; Li Zheng ; Duc-Truc Pham ; Stephen F. Lincoln ; Huy Tien Ngo ; Philip Clements ; Bruce L. May ; Robert K. Prud鈥檋omme ; Christopher J. Easton
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：June 15, 2011
• 年：2011
• 卷：50
• 期：12
• 页码：7566-7571
• 全文大小：900K
• 年卷期：v.50,no.12(June 15, 2011)
• ISSN：1520-5045

文摘

Competition between the aggregation of the octadecyl substituents of 3% randomly substituted poly(acrylate), PAAC18, and of the dodecyl substituents of the PAAC12 analogue, and their complexation by 尾-cyclodextrin, 尾CD, the linked dimers, N,N鈥?/i>-bis(6^A-deoxy-6^A-尾-cyclodextrin)urea, 66尾CD₂ur, and N,N鈥?/i>-bis(6^A-deoxy-6^A-尾-cyclodextrin)succinamide, 66尾CD₂su, and 纬-cyclodextrin, 纬CD, and the analogous dimers 66纬CD₂ur and 66纬CD₂su have been studied in aqueous solution. The zero-shear viscosities of 3.3 wt % aqueous solutions of PAAC18, decreases in the presence of 尾CD, 66尾CD₂ur, 66尾CD₂su and 纬CD, is little changed in the presence of 66纬CD₂ur, and increases in the presence of 66纬CD₂su. In contrast, the zero-shear viscosities of aqueous solutions of PAAC12 increase in the presence of 尾CD, 纬CD, and their dimers but they are much less than those of the corresponding PAAC18 solutions. These macroscopic variations are due to host鈥揼uest complexation of the octadecyl and dodecyl substituents by 尾CD, 纬CD, and their dimers (as shown by 2D ¹H NOESY NMR spectroscopy) competing with aggregation of the octadecyl and dodecyl substituents where differences in substituent length and cyclodextrin annular size are dominant factors.