Abstract
The conformation of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG) molecules at various interfaces has been investigated by sum frequency generation (SFG) vibrational spectroscopy. The interfaces studied include interfaces between pure liquid PEG (or PPG) or aqueous PEG (or PPG) solutions and air, fused silica, or solid polymers such as polystyrene (PS) and poly(methyl methacrylate) (PMMA). Depending on the hydrophobicity of the solid contacting media, the liquid polymers show different conformations at different interfaces, which can be correlated to molecular interactions at these interfaces. The favorable interaction between hydrophobic media and the hydrophobic segments, methylene or methyl groups, of polyethers causes an ordered conformation with these groups standing up at the interface. The unfavorable interaction between hydrophilic media and hydrophobic segments of the polyethers induces interfacial methylene or methyl groups to have a random structure or to lie down at the interfac...
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