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首页> 外文期刊>Biophysical Chemistry: An International Journal Devoted to the Physical Chemistry of Biological Phenomena >INTERACTION OF CALCIUM IONS AND POLYELECTROLYTES
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INTERACTION OF CALCIUM IONS AND POLYELECTROLYTES

机译：钙离子与高分子电解质的相互作用

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Interaction of Ca2+ ions with poly(acrylic acid) (PAA) or poly(methacrylic acid) (PMA) was studied using a Ca2+ ion sensitive electrode. When the PAA solution was neutralized with Ca(OH)(2), the Ca2+ activity had a maximum around the degree of neutralization 0.5 and decreased with further increase of Ca(OH)(2), being similar to the behavior of the Ca2+ activity in a maleic acid copolymer solution as reported previously. When the polymer concentration was as low as 0.1 mM, this peak in the Ca2+ activity was not observed and the counterion condensation theory held. The decrease of the Ca2+ activity in PAA solution at the degree of neutralization unity was depressed by the presence of several millimolar KCl. The Ca2+ activity in the PAA solution at the low degree of neutralization was increased by the presence of dilute KCl and decreased by the presence of concentrated KCl. The decrease of the Ca2+ activity in PMA solution was observed also at the degree of neutralization unity, but its extent was small compared with that of the PAA solution and the maximum of the Ca2+ activity was shifted to the degree of neutralization 0.75. The effects of KCl on the Ca2+ activity in the PMA solution were almost the same as those in the PAA solution. Interpretations of the behavior of the Ca2+ activity were discussed. [References: 12]
机译：使用Ca2 +离子敏感电极研究了Ca2 +离子与聚（丙烯酸）（PAA）或聚（甲基丙烯酸）（PMA）的相互作用。当用Ca（OH）（2）中和PAA溶液时，Ca2 +活性在中和度0.5附近最大，并随Ca（OH）（2）的进一步增加而降低，这与Ca2 +活性的行为相似如前所述在马来酸共聚物溶液中。当聚合物浓度低至0.1 mM时，未观察到该Ca2 +活性峰，并且抗衡离子凝聚理论得以维持。由于存在几个毫摩尔的KCl，抑制了PAA溶液中Ca2 +活性在中和度统一性上的降低。稀KCl的存在会提高PAA溶液中中和度较低时Ca2 +的活性，而浓KCl的存在会降低Ca2 +的活性。在中和度相同的情况下，在PMA溶液中也观察到Ca 2+活性的降低，但是与PAA溶液相比，其程度较小，并且最大Ca 2+活性移至中和度0.75。 KCl对PMA溶液中Ca2 +活性的影响与PAA溶液中的影响几乎相同。讨论了Ca2 +活性行为的解释。 [参考：12]

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