树枝状聚合物与芘分子在水溶液中的相互作用

The Mutual Effect between Dendrimer and Pyrene in Solution

王星媛 叶仲斌 吴敬恒

WANG Xingyuan YE Zhongbin WU Jingheng

为揭示疏水改性树枝状聚合物在水溶液中的聚集行为，使用芘荧光探针研究了疏水缔合聚合物（AP-P4）和树枝状聚合物在水溶液中与芘分子的相互作用，通过环境扫描电镜对比分析了两种聚合物在水溶液中的微观形貌。结果表明，随着聚合物浓度的增加，聚合物在水溶液中形成的疏水微区总量增加，芘分子在疏水微区的平均包容量达到最大值时对应的AP-P4和树枝状聚合物的质量浓度分别为1300 mg/L和600 mg/L。树枝状聚合物溶液包容芘分子的总量大于AP-P4，其所形成的疏水微区数量大于AP-P4。聚合物质量浓度大于870 mg/L时，树枝状聚合物对芘分子的平均包容量小于AP-P4。树枝状聚合物在水溶液中形成的三维网络结构中存在层铺状、致密排列的小网络结构，这种紧密的结构降低了树枝状聚合物的空间容积，使其对芘分子的平均包容量大幅降低。图9参17

In order to study the aggregation behavior of hydrophobic modification dendrimer in solution，fluorescence probe was used to research the mutual effect between pyrene and hydrophobic associating polymer AP-P4 or dendrimer. The microsturcture of two kinds of polymers in solution was compared through ESEM. The results showed that the amount of hydrophobic micro-domain formed in solution increased with increasing concentration of polymer. When the average capacity of hydrophobic micro-domain solubilizing pyrene molecule reached maximum，the mass concentratioin of AP-P4 and dendrimer was 1300 mg/L and 600 mg/L respectively. The capacity of dendrimer solution sloubilizing pyrene molecule was stronger than that of AP-P4 solution，and the number of hydrophobic micro-domain formed was larger too. While polymer concentraion was more than 870 mg/L，the average capacity of dendrimer solubilizing pyrene molecule was less than that of AP-P4. Comparing the microstructure of dendrimer and AP-P4 through ESEM，there were small network structure stacking，spreading and connecting with each other in three-dimensional network structure formed by dendrimer in solution，which increased the whole microstructure tightness but reduced the hydrophobica micro-domain volume of dendrimer and the average capacity of hydrophobic micro-domain solubilizing pyrene molecule.