Abstract
The interaction between poly(acrylic acid) (PAA) and oxyethylene oligomers (PEG) was investigated by solution microcalorimetry in water at 25°C. The enthalpy of interaction is endothermic, and, in the case of PEG-400 in large excess, the enthalpic parameter increases sharply with PEG/PAA ratio. No such behaviour was found for PEG-1000 and for dimethylated PEG-400. The apparent monomolar heat capacity of the binary solute was also determined, and the corresponding excess quantity is negative at any PEG/PAA ratio. The two series of microcalorimetric results indicate that PAA and oxyethylene oligomers interact noticeably in water and that a long PAA chain may be regarded as a linear adsorption surface for short PEG chains.
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