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In addition, the repulsion between and among different chains is enhanced. The water absorbency increases as the force caused by chain expansion in the network increases (Pourjava & Amini-Fazl, 2007). However, when the neutralization degree is too high, the Na+ concentration on the network of graft copolymers being formed increases, and the electrostatic repulsion between charges causes the contact of the heavy metal and coordination groups on the surface of the resin and chelate formation difficult. The excess in the degree of neutralization is not conducive to resin adsorption. However, with the increase in the neutralization degree, the shielding effect of Na+ on the carboxylic acid anion in the system gradually appears, which weakens the repulsion among the chains or adjacent carboxylic acid anions on the same chain and reduces the extension driving force of the network. Therefore, when the neutralization degree is too high, the swelling capacity is reduced.

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