In order to clarify the interaction between the continuous phase and the dispersion phase rich in polyacrylamide(PAM)

the interaction between PAM and PEG in water was studied by viscosity method.In a dilute aqueous solution of PAM

the segments of PAM molecular chains prefer to combine with water molecules through hydrogen bonding.However

the hydrogen bonding between PAM molecular chains increased with increasing concentration of PAM in water.Because the aqueous PEG solution is a poor solvent for PAM

the PAM molecular chains aggregated with each other and formed compact spherical clews.PEG molecular chains were then congregated around the PAM clew through the hydrophobic interaction

and entwisted on the surface of the PAM clew through hydrogen bonding between PAM and PEG.It was found that the interaction was strengthened with increasing the total polymer concentration

and the molecular weight of PEG or PAM.The strength of the interaction between PAM and PEG in water seems to be not changed markedly with rising temperature.The interaction was a little stronger at higher or lower temperatures.Raising the temperature destroyed the hydrogen bonding between PAM and PEG chains at first.However

the hydrogen bonding between PAM chains and water molecules was also reduced while raising the temperature sequentially.Therefore

the hydrophobic interaction between PAM and PEG in water was increased.The addition of ethanol

salt

acrylamide or urea reduced the hydrogen bonding between the PAM and PEG

and therefore the interaction between PAM and PEG in water was weakened whereas the hydrophobic interaction between PAM and PEG was increased.