Double hydrogen-bonding pH-sensitive hydrogels retaining high-strengths over a wide pH range.
Traditional pH-sensitive hydrogels inevitably suffer strength deterioration while the responsive weak acid or base groups are in the ionized state. In this study, we report on a facile approach to fabricate a novel pH-sensitive high-strength hydrogel from copolymerization of two hydrogen-bonding motif-containing monomers, 3-acrylamidophenylboronic acid and 2-vinyl-4,6-diamino-1,3,5-triazine with a crosslinker N,N-methylenebisacrylamide through hydrophilic optimization of the comonomer oligo(ethylene glycol) methacrylate. The double hydrogen bonding hydrogel exhibits both high tensile and compressive strengths over a broad pH range due to the unique ability to maintain at least one type of hydrogen-bonding crosslink over the whole course of pH change.
School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China.
Han
H
Gao
Ning
N
Wang
Xiufeng
X
Hu
Wenjing
W
Nan
Yanjiao
Y
Han
Wenguang
W
Liu
D000178:Acrylamides / Q000737:chemistry; D001897:Boronic Acids / Q000138:chemical synthesis / Q000737:chemistry; D020100:Hydrogels / Q000737:chemistry*; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D008689:Methacrylates / Q000737:chemistry; D014227:Triazines / Q000737:chemistry; D014753:Vinyl Compounds / Q000737:chemistry
C500826:2-vinyl-4,6-diamino-1,3,5-triazine; C419826:3-acrylamidophenylboronic acid; D000178:Acrylamides; D001897:Boronic Acids; D020100:Hydrogels; D008689:Methacrylates; D014227:Triazines; D014753:Vinyl Compounds; C021221:N,N'-methylenebisacrylamide