کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5188272 | 1381150 | 2007 | 10 صفحه PDF | دانلود رایگان |
Macroporous polyacrylamide (PAAm) hydrogels were prepared from acrylamide monomer and N,Nâ²-methylene(bis)acrylamide (BAAm) crosslinker in frozen aqueous solutions. It was found that the swelling properties and the elastic behavior of the hydrogels drastically change at a gel preparation temperature of â6 °C. The hydrogels prepared below â6 °C exhibit a heterogeneous morphology consisting of pores of sizes 10-70 μm, while those formed at higher temperatures have a non-porous structure. PAAm networks with largest pores were obtained at â18 °C. The pore size of the networks increased while the thickness of the pore walls decreased by decreasing the monomer concentration. The hydrogels formed below â6 °C exhibit superfast swelling and deswelling properties as well as reversible swelling-deswelling cycles in water and in acetone, respectively.
Journal: Polymer - Volume 48, Issue 1, 5 January 2007, Pages 195-204