Citation: Meng Yang, Bo-tian Liu, Ge Gao, Xiao-li Liu, Feng-qi Liu. POLY(MALEIC ANHYDRIDE-CO-ACRYLIC ACID)/POLY(ETHYLENE GLYCOL) HYDROGELS WITH pH- AND IONIC-STRENGTH-RESPONSES[J]. Chinese Journal of Polymer Science, ;2010, 28(6): 951-959. doi: 10.1007/s10118-010-9191-x shu

POLY(MALEIC ANHYDRIDE-CO-ACRYLIC ACID)/POLY(ETHYLENE GLYCOL) HYDROGELS WITH pH- AND IONIC-STRENGTH-RESPONSES

Received Date: 23 December 2009
Revised Date: 1 April 2010

Poly(maleic anhydride-co-acrylic acid), P(MA-AA), was synthesized by the free-radical copolymerization of maleic anhydride with acrylic acid, and fast responsive pH-sensitive poly(maleic anhydride-co-acrylic acid)/polyethylene glycol, P(MA-AA)/PEG, hydrogels were prepared using PEG as macromolecular cross-linking agent. FT-IR and 1H-NMR spectrometry were applied to characterize the structure of P(MA-AA). The influences of pH and ionic strength on the swelling behavior of P(MA-AA)/PEG hydrogels and the swelling-deswelling changes along with the repeated changes between acid and alkali conditions were studied. The results showed that there was a hundredfold difference in the swelling ratios between the conditions of acid and alkali, and the swelling capability could not be weakened after multiple swelling-deswelling cycles. The results of swelling kinetics demonstrated that the response rate of P(MA-AA)/PEG hydrogels was very fast, because the swelling transition points always occurred at 10 min. The pH-responsive hydrogels reported here might be a smart material for potentially applications in many areas, including biosensors, drug-delivery devices and tissue engineering.
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