Publications ::
Nanostructures in aqueous dispersions for surface sizing
Carceller R; Juppo A :: PAPERI JA PUU-PAPER AND TIMBER Vol. 87, no. 1, 2005, pp 35-37 :: 1 June 2005
A combination of conventional anionic surfactant and an anionic amphiphilic polymeric surfactant was used to make a new surface size composition by emulsion polymerisation. The copolymer was examined by cryo field emission scanning electron microscopy (FESEMCryo). Using a polymeric surfactant in the emulsion copolymeriation recipe it is possible to synthesize nanoparticles and an amphiphilic polymeric surfactant stabilizes polymer particles electrosterically. The high polymeric surfactant concentration used led to a large interfacial area and a large number of micelles where the polymerisation reaction could take place. This in turn led to a small particle size and to the copolymer dispersion having an ordered structure that creates layers in dry form. The copolymer particles were found in the network lines of the starch structure. During the drying process this structure is maintained and the films of the blends have a layered structure. Migration of hydrophobic and hydrophilic materials through the film will be prevented by the boundaries created by the layered structure. The spreading of liquids on the paper surface was prevented by this structure and confirmed by atomic force microscopy (AFM). (4 fig)
