Swelling behavior of hydrogels based on N,N'-Diethylacrylamide
Keywords:
Thermo-sensitive, swelling behavior, swelling ratio, swelling rate, semi-IPN hydrogel, N,N’-Diethylacrylamide, 2-hydroxyethyl methacrylateAbstract
In this work, two series of thermo-responsive hydrogels with semi-interpenetrating polymer network (semi-IPN) structure based on N,N’-Diethylacrylamide (DEA) and 2-hydroxyethyl methacrylate (HEMA) were synthesized and investigated by changing the position and content of HEMA monomer in the obtained materials, including P(DEA-co-HEMA)/PDEA (S1-structure) and PDEA/P(DEA-co-HEMA) (S2-structure). The morphological, chemical properties and swelling behaviors in pure water of the semi-IPN hydrogels were investigated. Fourier transform infrared (FTIR) spectra confirmed the polymerization ability of monomers. Scanning electronic microscopy (SEM) images showed that the pore size could be controlled by the added volume of linear polymer was in the range of 151 ± 39 ~ 340 ± 65 µm. The swelling ratio and swelling rate of the semi-IPN hydrogels increased significantly compared with that of the conventional hydrogel. In addition, the S1-structure hydrogels showed a faster swelling rate, higher swelling ratio and more thermo-sensitive than that of the S2-structure hydrogels.
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