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Deswelling of Poly(N-isopropylacrylamide) derived hydrogels and their nanocomposites with iron oxide nanoparticles as revealed by X-ray photon correlation spectroscopy

AuthorsHernández, Rebeca ; Criado, Miryam; Nogales, Aurora ; Sprung, Michael; Mijangos, Carmen ; Ezquerra, Tiberio A.
Issue Date2015
PublisherAmerican Chemical Society
CitationMacromolecules 48: 393-399 (2015)
AbstractHere we present results on the deswelling behavior of semi-interpenetrating polymer hydrogels of sodium alginate and poly(N-isopropylacrylamide) (PNI-PAAm) containing iron oxide nanoparticles by means of Xray photon correlation spectroscopy (XPCS). The experiments were carried out as a function of temperature starting from temperatures below the low critical solution temperature (LCST) of the materials to temperatures above their LCST. The hydrogels present a hyper-diffusive dynamics of similar nature as that found for the freeze-dried aerogels which has been attributed to their characteristic porous structure. The dynamics of the swollen samples is faster than that of the freeze-dried ones suggesting that water has an effect in accelerating the dynamics of the hydrogels. XPCS has been used to characterize the deswelling process as a function of temperature. Deswelling times for the different samples correlate well with the corresponding relaxation times of the relaxation processes measured by XPCS. (Graph Presented)
Identifiersdoi: 10.1021/ma502118a
issn: 0024-9297
e-issn: 1520-5835
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(CFMAC-IEM) Artículos
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