Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (09): 1911-1915.doi: 10.3866/PKU.WHXB20090923

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Synthesis of Poly(N,N-diethylacrylamide) and the Effect of Salts on the Thermosensitivity of Its Aqueous Solutions

WANG Huan-Xia, LIU Shou-Xin, FANG Yu, HAN Xiao-Yu, ZHANG Sa   

  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:2009-04-13 Revised:2009-06-15 Published:2009-09-03
  • Contact: LIU Shou-Xin


Poly(N,N-diethylacrylamide) (PDEAM) with a narrow molecular weight distribution was synthesized via atom transfer radical polymerization (ATRP) in methanol using CuBr/2,2'-bipyridyl as the catalyst system and ethyl-2-bromopropionate (EPN-Br) as the initiator. PDEAM was characterized by FT-IR, 1H-NMR, and gel permeation chromatography (GPC). The effects of PDEAM concentration, salts, and surfactant on the lower critical solution temperature (LCST) of PDEAMaqueous solutions were studied by transmittance measurements. It was found that the LCSTdecreased as the concentration of PDEAMincreased and that salts (NaCl, CH3COONa, KCl, Na2SO4, andMgSO4) resulted in a decrease of the LCST of the solution. Species and anions of the salts dominated the salt effect. On the contrary, sodiumdodecyl sulfate (SDS) resulted in an increase in the LCST of the PDEAMaqueous solutions.

Key words: Temperature sensitivity, Atomtransfer radical polymerization, Poly(N,N-diethylacrylamide), Lower critical solution temperature


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