Transfer Characteristics of Langmuir-Blodgett Films of Stereoregular Poly(Methyl Methacrylates)

Abstract

Systematic investigations of the effects of the transfer pressure, types of the substrates and stereoregularity on the transfer characteristics of the stereoregular PMMAs were performed in terms of the average transfer ratio. All of the stereoregular PMMA monolayers showed similar tendencies in transfer characteristics with respect to the transfer pressure. Z-type multilayers were formed at a transfer pressure below 1 mNm⁻¹ for the a- and s-PMMAs and 5 mNm⁻¹ for the i-PMMA, respectively. The average transfer ratio of the downward stroke increased as the transfer pressure increased from those values, forming Y-type multilayers at the transfer pressure of 10 mNm⁻¹ for the a-PMMA and s-PMMAs and at 15 mNm⁻¹ for the i-PMMA, respectively. The effect of the types of the substrate on the transfer characteristics was not significant except for the glass substrate when the first layers were baked.