Azhgozhinova Galiya S, Güven Olgun, Pekel Nursel, Dubolazov Artem V, Mun Grigoriy A, Nurkeeva Zauresh S
Department of Chemical Physics and Macromolecular Chemistry, Kazakh National University, Karasai Batyra 95, 480012 Almaty, Kazakhstan.
J Colloid Interface Sci. 2004 Oct 1;278(1):155-9. doi: 10.1016/j.jcis.2004.05.010.
The complex formation of uranyl ions (UO(2+)2) with poly(methacrylic acid) (PMAA) was investigated by potentiometric, conductometric, UV-visible, luminescence and FTIR spectroscopic, and thermal analysis methods. The stoichiometric ratio at complexation between polymer and uranyl ions was found to be equal to 2 polymer base units per uranyl ion. FTIR spectra of the PMAA-UO(2+)2 complex confirmed incorporation of metal ions into the polymer and showed that the electrostatic interactions play a major role in complexation. An increase of emission intensity in luminescence spectra of uranyl ions suggests influence of conformation peculiarity of the poly(methacrylic acid) chain. The thermal degradation of polycomplex starts at lower temperature as compared to pristine PMAA that is due to the lower thermal stability of PMAA-UO(2+)2 complex.
通过电位滴定法、电导法、紫外可见光谱法、发光光谱法、傅里叶变换红外光谱法以及热分析方法，研究了铀酰离子（UO₂²⁺）与聚甲基丙烯酸（PMAA）的络合物形成过程。结果发现，聚合物与铀酰离子络合时的化学计量比为每个铀酰离子对应2个聚合物碱基单元。PMAA-UO₂²⁺络合物的傅里叶变换红外光谱证实了金属离子已掺入聚合物中，并表明静电相互作用在络合过程中起主要作用。铀酰离子发光光谱中发射强度的增加表明聚甲基丙烯酸链的构象特性产生了影响。与原始PMAA相比，聚络合物的热降解起始温度较低，这是由于PMAA-UO₂²⁺络合物的热稳定性较低所致。
