کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
818235 | 1469434 | 2013 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Poly(acrylamide-co-acrylate)/rice husk ash hydrogel composites. II. Temperature effect on rice husk ash obtention
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Superabsorbent hydrogel composites based on poly(acrylamide-co-acrylate) and rice husk ash (RHA) were prepared by free-radical copolymerization in aqueous media, using N,N-methylenebisacrylamide (MBA), as crosslinker and potassium persulfate (K2S2O8), as initiator. The effect of calcination temperatures (400-900 °C) for obtaining RHA was evaluated. FTIR, WAXS, SEM-EDS and TGA were applied to characterize a series of hydrogels filled with RHA. The hydrogels composites were formed with constant amounts of RHA (10 wt.%) and crosslinking agent (0.1 mol-%) in relation to the relative to the total mass of acrylamide (AAm) and potassium acrylate (KAc) monomers (50-50 mol-%). A blank sample of poly(acrylamide-co-acrylate) hydrogel without RHA was used as control. A superabsorbent hydrogel composite, with a maximum absorption Weq > 1000 gwater/gabsorbent, was obtained with the RHA calcined at 900 °C. In addition, the hydrogel composite showed to be sensitive to the pH variation and to the presence of salts in the swelling media. From the results, it is possible to infer that the poly(acrylamide-co-acrylate)/RHA hydrogel composites presented good characteristics to be applied as soil conditioner for using in agriculture.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Part B: Engineering - Volume 51, August 2013, Pages 246-253
Journal: Composites Part B: Engineering - Volume 51, August 2013, Pages 246-253
نویسندگان
Jean de S. Cândido, Antonio G.B. Pereira, André R. Fajardo, Nágila M.P.S. Ricardo, Judith P.A. Feitosa, Edvani C. Muniz, Francisco H.A. Rodrigues,