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Citation: GAO Yuan, NING Zhigang, SONG Chunlei, LI Yang, ZHANG Wende, AN Huiyong, WANG Pixin. pH and Salt Concentration Sensitive Polyampholyte Microspheres:Synthesis and Properties[J]. Chinese Journal of Applied Chemistry, ;2011, 28(6): 624-628. doi: 10.3724/SP.J.1095.2011.00512 shu

pH and Salt Concentration Sensitive Polyampholyte Microspheres:Synthesis and Properties

GAO Yuan ^a ,
NING Zhigang ^a ,
SONG Chunlei ^b ,
LI Yang ^a ,
ZHANG Wende ^b ,
AN Huiyong ^b ,
WANG Pixin ^b,,

1.
a Chemistry and Biology Science College, Changchun University of Technology, Changchun;
2.
b Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: WANG Pixin,
Received Date: 12 September 2010
Available Online: 25 November 2010
Fund Project: 吉林省与中国科学院科技合作资金项目(2009SYHZ0027) (2009SYHZ0027)吉林省科技发展计划(20096023)资助项目 (20096023)

Polyampholyte microspheres with pH and salt concentration sensitive behaviors were prepared by acrylamide(AM),acryloylxyethyl trimethyl ammonium chloride(DAC) and methacrylic acid(MAA) in ethanol.The shape and conformation of microspheres were determined by transmission electron microscope and infrared spectroscopy,respectively.Meanwhile,the change behavior of the microsphere diameter in various pH solutions and in NaCl and CaCl₂ salt solutions was investigated.The results indicated that the diameter of microspheres was 1 177 nm,and polydispersity index(PDI) value was 0.181 at the second step,which were greater than those(d=764 nm;PDI=0.069) at the first step.The diameter of microspheres increased with decreasing pH when the pH was lower than pH=4.3.Whereas when the pH was higher than 4.3,the diameter increased with increasing pH,and a minimum diameter was obtained when the pH was 4.3.At the isoelectric point,the dispersion exhibited a typical antipolyelectrolyte effect in univalent NaCl salt solution.However,in multivalent CaCl₂ salt solution,the diameter of microspheres first increased and then decreased.
- pH-responsive,
- salt concentration responsive,
- polyampholyte,
- antipolyelectrolyte effect
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