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|Title:||Synthesis of poly(Sodium Acrylate) nanogels via semicontinuous inverse heterophase polymerization|
|Abstract:||The synthesis of superabsorbent poly(sodium acrylate) by semicontinuous inverse heterophase polymerization is reported here. In this process, an aqueous solution of sodium acrylate, initiator, and a cross-linking agent is dosed at a controlled rate over an organic solution containing surfactant. These nanogels exhibit a large swelling ratio (compared to the dry nanoparticles synthesized by inverse microemulsion polymerization), which increase to some extent with temperature, but then at ca. 30°C, they de-swell slightly. Possible explanations to this behavior are the release of residual stresses originated during nanoparticles purification and drying, the association-dissociation of ionic clusters, and the thermoelastic inversion point of the elastic modulus of the nanogels. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.|
|Appears in Collections:||Producción científica UdeG (prueba)|
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