グラフト化ナイロン6繊維へのスチレン/2-ヒドロキシエチルメタクリレート共重合体ラテックスの付着性

抄録

The deposition of polymer latex onto nylon 6 fibers grafted with acrylic and methacrylic acids was studied as the function of pH and the degree of grafting. The polymer latices were hydrophobic polystyrene (PS) and hydrophilic polystyrene/2-hydroxyethyl methacrylate copolymer [P (St/HEMA₁₀)] latices. In an aqueous solution of pH from 3 to 10 the ζ-potentials of both kinds of latices were negative, and the negative ζ-potentials of P (St/HEMA₁₀) latex were smaller than those of PS latex because the slipping plane in electrical double layer was thrusted toward diffused layer by the water-soluble layer formed by poly-HEMA. On the acidic side, the amount of the deposits of both kinds of latices onto the ungrafted and the grafted fibers increased remarkably with a decrease in pH, but on the alkaline side, both kinds of latices were scarcely deposited onto these fibers. With an increase in the degree of grafting, the amount of the deposits of the latices onto the fibers reduced. The amount of the deposits of P (St/HEMA₁₀) latex onto the grafting fibers were smaller than that of PS latex. These results suggest that the water-soluble polymer layers on the grafted fiber surface introduced by grafting and on P (St/HEMA₁₀) latex surface play an important role on the deposition. The V_{T max}, which was the energy barrier to deposite, was calculated from the theory of heterocoagulation. With an increase in the degree of grafting, the V_{T max} increased, and the deposition rate constant K_c, calculated from the relation between the amount of the deposits and time, decreased. The relation between the values of k_c and V_{T max} indicates good correspondence.