RELAXATIONS IN MOLECULARLY THIN LIQUID-FILMS

The linear viscoelastic behaviour of molecularly thin OMCTS (octamethy lcyclotetrasiloxane) films has been studied as a function of film thic kness using a modified surface forces apparatus. The frequency spectra of viscoelastic relaxation measured at different him thicknesses supe rposed onto a master curve when each spectrum was shifted horizontally and vertically with respect to the frequency spectrum at a reference film thickness. The master curve indicates a wide separation between t wo sets of viscoelastic relaxations and suggests a gradual glass-like transition to solidity.