Authors: Hui Yang Yebang Tan Jingcheng Hao Huabiao Yang Xiaona Ren
Publish Date: 2011/02/24
Volume: 18, Issue: 6, Pages: 1735-1742
Abstract
The interaction between polymethacrylic acid PMAA and cucurbit7uril CB7 in aqueous solution were investigated by dynamic light scattering DLS fluorescence techniques UVspectrophotometer and resonance light scattering RLS The experimental results show that the aggregates were formed between CB7 and H+ of PMAA by the hydrogen bonding interaction that increases with increasing the concentration of CB7 which leads to the formation of the larger aggregates Interestingly PMAA has temperature sensitivity with the addition of CB7 by UVspectrophotometer and DLS The pH of the solution of PMAA appears a inflection point with increasing the concentration of CB7 comparing with the increase of the electrical conductivity all the time with the addition of CB7 In addition in order to investigate the effect of cation on the size of the aggregates and avoid the effect of other anions at the same time the dilute ammonia was added into the solution of PMAA The experimental data show that the size of the aggregates increases with adding CB7 because CB7 could combine with both NH 4 + by the electrostatic and iondipole interactions and H+ by the hydrogen bonding interaction and a possible model is proposed to explain the hostguest interactions between PMAA and CB7The authors are grateful for financial support from the National Natural Science Foundation of China No 20674045 National Basic Research Program of China 973 Program 2009CB930103 and Graduate Independent Innovation Foundation of Shandong University yzc09057
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