Abstract
Relations between the rheological properties and the degree of aggregation of dispersed particles were investigated for suspensions of photosensitive particles. Photosensitive particles were prepared by introducing cinnamoyl group _??_ into styrene-divinylbenzene copolymer particles through the reaction with sodium cinnamate. The photocrosslinking reaction between particles, i. e. the degree of aggregation of photosensitive particles, was controlled by adjusting the irradiation time of a light.The steady-flow and dynamic viscoelastic properties of disperse systems of these particles in diethylphthalate were measured by a cone-plate type rheometer, and the degree of aggregation of particles was measured by the light scattering method. The latter is based on the increase in intensity of forward scattering with increasing aggregation.Shearing stress and dynamic viscoelastic functions increase with increasing degree of aggregation, and the so-called second plateau, which corresponds to the relaxation of the aggregate structure, begins to be observed with it. The relaxation time of disperse systems was also related quantitatively to the degree of aggregation.
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