کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1396655 | 984188 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Preparation of homogeneous polyacrylamide hydrogels by free-radical crosslinking copolymerization Preparation of homogeneous polyacrylamide hydrogels by free-radical crosslinking copolymerization](/preview/png/1396655.png)
Network microstructures of acrylamide (AAm)-based hydrogels were investigated by static and dynamic light scattering techniques. The hydrogels were prepared by free-radical crosslinking copolymerization of the monomers acrylamide (AAm), N,N-dimethylacrylamide (DMA) and N-isopropylacrylamide (NIPA) with N,N′-methylenebis(acrylamide) as a crosslinker in aqueous solutions. It was observed that the addition of DMA or NIPA into the comonomer feed suppresses the extent of frozen concentration fluctuations in polyacrylamide (PAAm) hydrogels. The cooperative diffusion coefficient increases while both the static and dynamic correlation lengths decrease as the amount of DMA in the comonomer feed is increased. Formation of homogeneous PAAm hydrogels by introduction of hydrophobic moieties was explained as a result of the steric effect of the bulky side groups on DMA or NIPA segments.
Journal: European Polymer Journal - Volume 43, Issue 7, July 2007, Pages 2913–2921