Swelling behavior of amphiphilic gels based on hydrophobically modified dimethylaminoethyl methacrylate |
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| Authors: | Cancan Li Maolin Zhai Jing Peng Jiuqiang Li |
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| Affiliation: | a Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
b Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100871, China |
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| Abstract: | The amphiphilic gels based on hydrophobically modified dimethylaminoethyl methacrylate with different 1-bromoalkanes (1-CnH2n+1Br, n = 2, 4, 6, 8, 12) were synthesized by radiation-induced polymerization and crosslinking. The length of alkyl side chains had significant influence on the swelling behavior of the resulting gels. The swelling degree of the gels decreased with the increase of side chain length, and the gel hardly swelled when n = 12. The effect of temperature and ionic strength on the swelling behavior of the resulting gels revealed that (1) the gels with longer side chains (n ≥ 8) had upper critical solution temperature, while other gels were not thermo-sensitive. (2) Antipolyelectrolyte effect was observed when immersing the gels (n ≥ 8) in NaCl solutions in certain concentration range. The dramatic difference in swelling behavior was attributed to the different gel structures. The gels with short side chains (n ≤ 6) had cellular structure of normal polyelectrolyte gels. The gels (n ≥ 8) had an aggregation gel structure caused by the hydrophobic interaction among alkyl groups and the formation of ion-cluster between tetra-alkyl ammonium cation and Br−, which had been analyzed with the aid of SEM, Br−-selective electrode and fluorescence molecular probe. |
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| Keywords: | Amphiphilic gels Temperature-stimuli responsive Antipolyelectrolyte effect |
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