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We have observed, for the first time, that when the initial chain conformation changed from coil to globule, the association of linear poly(N-vinylcaprolactam-co-sodium acrylate) chains could gradually change from a reaction limited to diffusion limited process, reflected in a change of the fractal dimension of the resultant aggregates from ∼2.5 to ∼1.6. Such an influence of the initial chain conformation...
The temperature dependence of the complexation between thermally sensitive spherical poly(N-vinylcaprolactam-co-sodium acrylate) microgels and linear gelatin chains without and with the addition of Ca2+ was studied by a combination of static and dynamic laser light scattering over a wide range of the gelatin/microgel ratios ([G]/[M]) in terms of the complex's average hydrodynamic radius (〈Rh〉), weight...
The microgels made of poly(N-vinylcaprolactam) (PVCL) and a few percent of sodium acrylate (SA) were used as a model system to study the cation induced aggregation of colloid particles. Using such microgels make the aggregation controllable and reversible because PVCL can gradually change from hydrophilic (soluble) to hydrophobic (insoluble) in water when the temperature is increased in the range...
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