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作 者:Jian Hong De-xia Zhou Hong-xing Hao Min Zhao Hong-tao Bian 洪剑;周德霞;郝宏星;赵敏;边红涛(陕西师范大学化学化工学院,应用表面与胶体化学教育部重点实验室,西安710119)
出 处:《Chinese Journal of Chemical Physics》2020年第5期540-546,I0078,共8页化学物理学报(英文)
基 金:supported by the National Natural Science Foundation of China(No.21873062);the Fundamental Research Funds for the Central Universities(GK202001009);the Natural Science Basis Research Plan in Shaanxi Province of China(No.2020JM-295);the 111 Project(B14041);Program for Changjiang Scholars and the Innovative Research Team in University(IRT-14R33)。
摘 要:Hydrogels show versatile properties and are of great interest in the fields of bioelectronics and tissue engineering.Understanding the dynamics of the water molecules trapped in the three-dimensional polymeric networks of the hydrogels is crucial to elucidate their mechanical and swelling properties at the molecular level.In this report,the poly(DMAEMA-co-AA)hydrogels were synthesized and characterized by the macroscopic swelling measurements under different pH conditions.Furthermore,the microscopic structural dynamics of pH stimulus-responsive hydrogels were studied using FTIR and ultrafast IR spectroscopies from the viewpoint of the SCN-anionic solute as the local vibrational reporter.Ultrafast IR spectroscopic measurements showed the time constants of the vibrational population decay of SCN-were increased from 14±1 ps to 20±1 ps when the pH of the hydrogels varied from2.0 to 12.0.Rotational anisotropy measurements further revealed that the rotation of SCNanionic probe was restricted by the three-dimensional network formed in the hydrogels and the rotation of SCN-anionic probe cannot decay to zero especially at the pH of 7.0.These results are expected to provide a molecular-level understanding of the microscopic structure of the cross-linked polymeric network in the pH stimulus-responsive hydrogels.
关 键 词:Ultrafast IR spectroscopy HYDROGEL pH stimulus responsive Structural dynamics
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