等温滴定量热法
乙二醇
化学
环糊精
PEG比率
胺气处理
轮烷
高分子化学
分子
滴定法
质子核磁共振
热稳定性
结合常数
特里斯
衍生工具(金融)
立体化学
超分子化学
有机化学
物理化学
结合位点
经济
金融经济学
生物化学
财务
作者
Ana-Maria Resmeriţă,Khaleel I. Assaf,Alexandra I. Lazar,Werner M. Nau,Aurica Farcaș
标识
DOI:10.1016/j.eurpolymj.2017.06.015
摘要
Cucurbit[7]uril (CB7), native α-cyclodextrin (αCD) and its tris-O-methylated derivative (TMαCD) as macrocyclic host molecules and amine-terminated poly(ethylene glycol) (PEG) as neutral guest were used for the synthesis of 3-CB7, 3-αCD and 3-TMαCD polyrotaxanes. The binding affinities of the neutral PEG guest into the CB7, αCD and TMαCD cavities were evaluated by isothermal titration calorimetry. The high value of the stability constant (1 × 104 M−1) indicates that PEG provides a preferential binding to CB7 over αCD. The polyrotaxane structure was confirmed by FT-IR and 1H NMR spectroscopy. The coverage ratio of the PEG with CB7, αCD and TMαCD macrocycles, were 63%, 71%, and 30%, respectively. The polyrotaxanes 3-CB7 and 3-αCD exhibit an enhancement in thermal stability compared with the non-rotaxane 3 counterpart. In addition, polyrotaxane 3-CB7 shows blue-shifted absorption by more than 20 nm and enhanced water solubility.
科研通智能强力驱动
Strongly Powered by AbleSci AI