Abstract
In this work firstly the thermo-sensitive polymer hydrogels were obtained by three-dimensional radical copolymerization of water-soluble HEA and hydrophobic monomer ethyl acrylate (EA) in the presence of crosslinking agent N,N’-methylenebisacrylamide (BAA). The hydrogels with certain copolymer compositions showed thermo-sensitive behavior in aqueous solutions. The regularity of complex formation of cross-linked copolymer HEA-EA with anionic and cationic surface-active substances have been studied. The swelling behavior of the hydrogels in cetylpyridinium bromide aqueous solutions was studied. Increased swelling of the hydrogels was observed in the surfactant solutions. The increased swelling was more prominent for the hydrogels with a higher content of the hydrophobic moiety in the copolymer composition and with the higher surfactant concentration. The reason for the observed phenomenon is discussed.
Highlights
Stimuli-responsive materials have attracted significant attention in the past two decades due to their diverse applications
From the science and practical point intelligent materials based on water-soluble polymers are of great interest
In the main monomer mixture an impact of the ethyl acrylate (EA) amount to the flow of the gel fraction and swelling uniformity in the water of the HEA-EA reticulated copolymers is shown in the Table 1
Summary
Stimuli-responsive materials have attracted significant attention in the past two decades due to their diverse applications. Water-soluble polymers exhibiting lower critical solution temperature (LCST) are among the most interesting stimuli-sensitive materials due to numerous potential applications in controlled release systems [1], biotechnology [2], separation and enrichment technologies [3], and stabilization of colloids [4]. In our work we used another approach for synthesis of series new thermosensitive polymers of linear and cross-linked structure This approach includes radical copolymerization of hydrophilic monomers with hydrophobic ones. The resulting polymers would have a tunable hydrophilic-hydrophobic balance and exhibit temperature-induced phase separation This approach was demonstrated in several published studies, where thermosensitive polymers were synthesized by free radical copolymerization of the following monomeric pairs: vinyl ether of ethyleneglycol (VEEG)-vinyl butyl (VBE), VEEG-vinyl isobutyl ether [10], vinyl ether of diethyleneglycol-VBE [11], 2-hydroxyethylacrylate (HEA) – VBE [12], HEA – butylacrylate [13], hydroxyethylacrylate (HEA)-hydroxyethylmethacrylate [14] and N-vinylpyrrolidone – vinyl propyl ether [15]. In this work firstly the thermosensitive polymer hydrogels were obtained by three-dimensional radical copolymerization of water-soluble HEA and hydrophobic monomer ethyl acrylate (EA) in the presence of crosslinking agent N,N’-methylenebisacrylamide (BAA)
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