Abstract
Deposition of polymer latex onto nylon 6 fibers, ungrafted or grafted with acrylic and methacrylic acid, in shaking conditions was studied with regard to pH dependence of the amount of deposition of polystyrene [PS], styrene/acrylic acid copolymer [P (St/AA)] and styrene/acrylamide copolymer [P (St/AAm)] latices, all prepared without emulsifier. With decreasing pH in acidic region, the amount of deposition of each latex onto both ungrafted or grafted fibers increased remarkably, while scarce deposition was observed in alkaline region. With increasing degree of grafting, the amount of deposition of each latex decreased because of steric hindrance due to water-soluble polymer layer formed by polymer chain grafted on the fiber surface. The amount of deposition of latex at pH 4 onto the fiber decreased in the order of P (St/AAm)>PS>P (St/AA). These results suggested the existence of bridging effect between the polymer chain on P (St/AAm) latex and the fiber, and of electrostatic repulsion force between P (St/AA) latex and the fiber. The deposition was more remarkable with shaking than without, regardless of the type of latex.
