Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (08): 2189-2194.doi: 10.3866/PKU.WHXB20100819

• COLLOID AND INTERFACE CHEMISTRY • Previous Articles     Next Articles

Synthesis of P(DEAM-co-NAS) and the Environmental Effects of Its Temperature Sensitivity

ZHANG Sa, LIU Shou-Xin, HAN Xiao-Yu, DANG Li, QI Xiao-Jun, YANG Xi   

  1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, P. R. China
  • Received:2010-03-02 Revised:2010-04-12 Published:2010-07-23
  • Contact: LIU Shou-Xin
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973106).


Poly(N,N-diethylacrylamide-co-N-acryloxysuccinimide) (P(DEAM-co-NAS)) was synthesized by free radical solution polymerization and copolymerization ratios of 7.9∶1, 3.5∶1, 2.5∶1, 2∶1, 1.5∶1 were used. The copolymer structures were characterized by Fourier transform infrared (FTIR) spectrometry and nuclear magnetic resonance (1H NMR). The copolymer compositions and the properties of the medium environment largely influence the temperature sensitivities of the P(DEAM-co-NAS) aqueous solutions. The lower critical solution temperature (LCST) of the P(DEAM-co-NAS) aqueous solution increased with an increase in the NAS content. The addition of salts resulted in a linear decrease in the LCST of the P(DEAM-co-NAS) aqueous solution and this depended on the anion valence of the salts. The addition of organic acids can reduce the LCST of the P(DEAM-co-NAS) aqueous solution. Moreover, the addition of NaOH, ethylenediamine, and putrescine leads to an increase in the LCST of the P(DEAM-co-NAS) aqueous solution. The effects of ethylenediamine and putrescine on the LCST of the P(DEAM-co-NAS) aqueous solution were greater than that of NaOH.

Key words: Temperature sensitivity, Poly(N,N-diethylacrylamide-co-N-acryloxysuccinimide), Lower critical solution temperature, Medium, Environmental effect


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