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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Physico-chemical studies on Cu(II) complexes of acrylate chelating polymers
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Physico-chemical studies on Cu(II) complexes of acrylate chelating polymers

机译：丙烯酸螯合聚合物Cu（II）配合物的理化研究

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摘要

Metal chelating polymers containing amide and carboxylic groups were prepared by gamma-radiation polymerization of acrylic acid (AA) monomers in the presence of polyacrylamide (PAM). The resins obtained were loaded by copper ions and characterized by FT-IR spectroscopy, electron spin resonance (ESR), thermogravimetric analysis (TGA), and differential scanning calorimetery (DSC). The IR spectra indicated a lower frequencies shift in the carbonyl bands due to copper ion chelation with carbonyl groups in the polymer resins. Also, the IR spectra reveal a splitting in the hand at 3600-3200 cm(-1) that due to the coordination of the NH and OH groups with copper ions. The ESR spectrum was anisotropic with hyperfine structure having the following values 2.3808 and 2.07218 for g(parallel to) and g(perpendicular to), respectively. These spectra for copper ions have square planar coordination with two nitrogen and two oxygen atoms. TGA and DSC studies show that radiation crosslinking and complexation with copper ion increase the thermal stability of PAM-AA resins. Meanwhile, resin complexes with copper ion showed a higher thermal stability than pure resin. The increase in thermal stability may be correlated with the metal ions coordination with NH and OH groups; this coordination prevents the splitting of ammonia and water molecules. Also, the metal ions providing a coordination crosslink between polymer chains could increase thermal stability.
机译：在聚丙烯酰胺（PAM）存在下，通过丙烯酸（AA）单体的γ辐射聚合反应制备了含有酰胺基和羧基的金属螯合聚合物。所得树脂用铜离子负载，并通过FT-IR光谱，电子自旋共振（ESR），热重分析（TGA）和差示扫描量热法（DSC）进行表征。红外光谱表明，由于铜离子与聚合物树脂中的羰基螯合，羰基带的频移较低。此外，红外光谱显示在3600-3200 cm（-1）处的手裂，这是由于NH和OH基团与铜离子的配位所致。 ESR光谱是各向异性的，具有超精细结构，其g（平行于）和g（垂直于）分别具有以下值2.3808和2.07218。这些铜离子光谱具有两个氮原子和两个氧原子的方形平面配位。 TGA和DSC研究表明，辐射交联和与铜离子的络合增加了PAM-AA树脂的热稳定性。同时，具有铜离子的树脂配合物显示出比纯树脂更高的热稳定性。热稳定性的增加可能与金属离子与NH和OH配位有关。这种配位防止氨和水分子分裂。同样，在聚合物链之间提供配位交联的金属离子可以增加热稳定性。

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