Preparation and Sensitivity Behaviors of Chitosan-based Intelligent Hydrogels
SHU Jing1, FENG Xiao-hui1, ZHENG Li-na2, SANG Xi-qin1, WANG Dan-dan3
1. Provincial Key Laboratory of Oil & Gas Chemical Technology, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
2. College of Marine Environmental Engineering, Dalian Ocean University, Dalian 116023, Liaoning, China;
3. Petrochina Daqing Oilfield No.9 Oil Production Plant, Daqing 163853, Heilongjiang, China
Abstract：Chitosan-based ternary intelligent hydrogels of pH/temperature-sensibility were prepared on the basis of chitosan/polyvinylpyrrolidone(CS/PVP)hydrogels with polyvinyl alcohol(PVA)introducing,using glutaraldehyde as crosslinking agent and ammonium ceric nitrate as initiator. The results indicated that the introduction of PVA increased the concentration of CS in the hydrogels significantly and made the temperature-sensitive grade increase. Especially, the hydrogels indicated obvious temperature-sensitivity at 35℃. Under the optimal conditions, that is, 6.25%PVA(mass fraction, compared to PVP), 5.1% initiator, 0.4% cross-linking agent, 80℃ and 6h, the maximum swelling ratio of hydrogels was about 1500%. Thermo-sensitive and pH-sensitive experiments showed that the hydrogels were of excellent thermo-sensibility and pH-sensibility. The chitosan-based ternary hydrogels were of four grades temperature-sensitivity and good pH-sensitivity with the abrupt change point at 2.0.
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2013, Vol. 0 
