Dynamic light scattering investigation of guar/dextran mixtures in aqueous solutions

Dextran and guar solutions and their mixtures were investigated by dynamic light scattering. The measurements have shown that dextran solutions present a major fast decay mode and another slower decay mode. Solutions of guar alone and dextran/guar mixtures have shown up to four different modes. The large number of modes may be caused by the aggregation of guar molecules. Although guar/dextran form very complicated mixtures, partly because of the aggregation of guar, an attempt is made to interpret these measurements within the framework of the theories of ternary polymer solutions.