Cyclodextrin-Based Hyperbranched Polymers: Molecule Design, Synthesis, and Characterization

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• 作者：Wei Tian ; Xiaodong Fan ; Jie Kong ; Tao Liu ; Yuyang Liu ; Yi Huang ; Shengjie Wang ; Guobin Zhang
• 刊名：Macromolecules
• 出版年：2009
• 出版时间：February 10, 2009
• 年：2009
• 卷：42
• 期：3
• 页码：640-651
• 全文大小：442K
• 年卷期：v.42,no.3(February 10, 2009)
• ISSN：1520-5835

文摘

The cyclodextrin (CD) molecule, a host for a variety of smaller molecular guests, and hyperbranched polymers both possess molecule cavities in their molecular architectures. If the hyperbranched poly(β-cyclodextrin)s are established using modified β-CD molecules as monomers, their molecular inclusion capabilities for smaller molecular guests may be enhanced due to the combination of two different molecule cavities from both their hyperbranched topography architecture and CD molecule chain segments. Herein, three types of hyperbranched poly(β-cyclodextrin)s, i.e., HBP-AB_x from AB_x-type β-CD monomers, HBP-(B_y + AB_x) from B_y core molecules and AB_x-type β-CD monomers, and water-soluble HBP-AB₂ from AB₂-type β-CD monomers, were synthesized via hydrosilylation reaction under the thermal or ultraviolet activated polymerization. The hyperbranched structures of resultant poly(β-cyclodextrin)s were characterized using ¹H NMR, ¹³C NMR, ²⁹Si NMR, ¹H−²⁹Si heteronuclear multiple bond correlation, and size exclusion chromatography/multiangle laser light scattering (SEC/MALLS). The molecule inclusion and recognition behaviors of the novel hyperbranched poly(β-cyclodextrin)s as well as their macromolecular structures, degree of branching, and thermal properties were investigated in detail. UV−vis spectroscopy results show that HBP-AB₂ has molecular inclusion capabilities and also can form inclusion complexation with single or double guests, including phenolphthalein (PP) and methyl orange (MO). Compared with AB₂-type β-CD monomer, the molecular inclusion capability of the hyperbranched polymer was enhanced. Furthermore, HBP-AB₂ presents molecular recognition behavior when MO solution is added into their PP solution.