Studies On The Synthesis And Properties Of Acrylamide Polyelectrolytes

In this paper, cationic polyacrylamide, anionic polyacrylamide and gender polyacry-lamide microgel have been prepared by in ethanol. Main contents and results are as follows:A cationic polyacrylamide(CPAM) was prepared by acrylamide(AM),acryloylxyethyl trimethyl ammonium chloride(DAC),N-N'methylene-bis-propionamide(BIS) and azobisiso.-butyronitrile(AIBN) as initiator in ethanol by precipitation polymerization. The influencing factors of the precipitation cationic polymerization were systematic studied, such as reaction time, reaction temperature, molar ratio, total monomer concentration, initiator concentration on the polymer conversion rate.The shape and conformation of CPAM were determined by Transmission Electron Micrograph and Infrared Spectroscopy, respectively.A better synthesis conditions was, total monomer concentration of 5%(wt), monomer molar ratio of AM:DAC=7:1, concentration of initiator 0.8%(wt), crosslinker lmol%, polymerization temperature 60℃, reaction time 8h.In this paper, a series of poly(methacrylic acid/acrylamide) microspheres(APAM) based on acrylamide (AM), methacrylic acid (MAA) have been prepared by precipitation polymerization in ethanol.The reaction conditions, which affected size and size distribution were investigated. The structure of microspheres, morphology, pH-sensitive behavior have been characterized through Infrared Spectroscopy (FTIR), turbidimetric method and transmission electron microscopy (TEM), respectively. Monodisperse polymer polymer microspheres with different size and size distribution can be designed. Monodisperse polymer microspheres in the size range of 700nm-1100nm were prepared in reaction conditionsThe polyampholyte microspheres with the pH-and salt concentration sensitive behaviors were prepared by AM,DAC and MAA in ethanol. The shape and conformation of microspheres were determined by Transmission Electron Micrograph and Infrared Spectroscopy, respectively. Meanwhile, the particle sizes change behavior of microspheres in distilled water with vairous pH values and the salt solutionswith different concentrations were investigated. The results indicated that the polyampholyte microspheres possessed a good pH-responsive behavior and a U-type of pH-volume transition. With the increasing of concentration of the salt solutions, the first decreased and then having a slight upward trend. At the isoelectric point (pI=4), dispersion exhibited typical antipolyelectrolyte effect in univalent saltl solution. However, in multivalent salt solution, the particle sizes first increased and then decreased.