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| Preparation of Polyacrylic Acid Type Hydrogel and Its pH Sensitive Behavior in Alkaline Solution |
| YANG Yuxia, YANG Huaiyu |
| State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
YANG Yuxia YANG Huaiyu. Preparation of Polyacrylic Acid Type Hydrogel and Its pH Sensitive Behavior in Alkaline Solution. Chin J Mater Res, 2012, 26(1): 85-90.
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Abstract A series of pH sensitive poly(acrylic acid-co-acrylamide) hydrogels with different acrylic acid mass fraction (fAAc) were synthesized by the free radical polymerization. The swelling behavior of these hydrogels was studied in alkaline buffer solution and NaOH solution with different pH values, respectively. The results showed that the poly(acrylic acid) (PAAc) and poly(acrylic acid–co–acrylamide) (P(AAc–co–AAm)) hydrogels exhibit the excellent pH sensitivity and their equilibrium swelling ratios (ESR) in NaOH solution are higher than those in buffer solution, whereas the poly(acrylamide) (PAAm) only presents the pH sensitivity in NaOH solution. In the two kinds of solution, the ESR of P(AAc–co–AAm) hydrogels increased with the increasing of fAAc in polymer. Furthermore, in the buffer solution, the swelling behavior of P(AAc–co–AAm) hydrogel acts as similar as PAAc when the fAAc ≥20%, while it exhibits analogous swelling characteristics as PAAc and PAAm when the fAAc <20%. The swelling behaviors of hydrogels synthesized are mainly controlled by the electrostatic repulsive and the ion shielding effects in polymer network.
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Received: 26 April 2011
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| Fund: Supported by National Natural Science Foundation of China No.51071161. |
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