Nanocomposites based on poly(acrylamide-co-acrylate) and cellulose nanowhiskers

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• 作者：Cristiane Spagnol^a ; Francisco H.A. Rodrigues^a ; ^b ; Alberto G.V.C. Neto^a ; Antonio G.B. Pereira^a ; André ; R. Fajardo^a ; ^{drefajardo@hotmail.com} ; Eduardo Radovanovic^a ; Adley F. Rubira^a ; Edvani C. Muniz^a
• 关键词：Composite ; Hydrogels ; Cellulose nanowhiskers ; Smart materials
• 刊名：European Polymer Journal
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：48
• 期：3
• 页码：454-463
• 全文大小：1243 K

文摘

Superabsorbent hydrogels, based on poly(acrylamide-co-acrylate) filled with cellulose nanowhiskers (CNWs), were synthesized by free-radical aqueous copolymerization, using N,N-methylenebisacrylamide (MBAAm), as crosslinker, and potassium persulfate (K₂S₂O₈), as initiator. A series of hydrogels was synthesized varying the percentage of CNWs (1, 2, 5, 10, and 20 wt. % ) and the amount of crosslinking agent (0.05, 0.10, 0.15, and 0.20 mol. % ). The hydrogels were characterized by FTIR and XRD techniques and their morphologies were investigated by SEM images. Superabsorbent hydrogel with W_eq > 1195 /g_gel was obtained with percentage of 10 wt. % of CNWs and 0.05 mol. % of crosslinking agent. The hydrogel showed to be responsive to the pH-variation (2-12) and also to the presence of salts (NaCl, KCl, MgCl₂, and CaCl₂). The hydrogel exhibited a pH-responsiveness and cation-sensitivity character so that a swelling-deswelling pulsatile behavior was recorded at pH 2-8 as well as cycles of hydrogel immersion in sodium and calcium salts solutions.