INTERACTION OF SURFACTANTS WITH POLY(ACRYLOYL-L-PROLINE METHYL-ESTER)GEL AND ITS STATISTICAL MOMENT ANALYSIS

The swelling behavior of acryloyl-L-proline methyl ester (A-ProOMe) ge l with a reversible and stepwise volume change was studied in aqueous solutions containing sodium dodecyl sulfate (SDS) and lithium dodecyl sulfate (LDS). The transition temperature was evaluated from both the midpoint of the slope under the swelling vs temperature curve (VPTT) a nd the statistical moment analysis using an area under the curve (ISTT ). With the addition of surfactants, the VPTT and ISTT increased and, as a result, it was found that no changes in transition temperature ar e influenced by the difference between the counterions of the two surf actants. A plot of VPTT and ISTT gave a straight line with a reasonabl e correlation, suggesting that the transition temperature of the gel, which is affected by surfactant concentration, can be evaluated from I STT.