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Home  >  Journal list  >  Polymer Journal  >  Vol.28  No.2 (1996)  >  pp.164-168

Polymer Journal
<<Previous article Vol.28  No.2 (1996)   pp.164 - 168 Next article>>

Structural Relaxation of Ultrathin Polymer Films Prepared by the Langmuir-Blodgett Technique. Molecular Weight Effect on the Diffusion of Polymer Segments

Shinzaburo Ito1), Kenji Kawano1), Michiaki Mabuchi1) and Masahide Yamamoto1)
1) Department of Polymer Chenlistry, Graduate School of Engineering, Kyoto University

ABSTRACT:  Structural relaxation of polymer Langmuir-Blodgett (LB) films has been studied by the energy transfer method, in particular, with respect to the molecular weight (Mw) effect on the diffusion processes. A very high molecular weight poly(vinyl octanal acetal) (PVO) was prepared as the host matrix of the LB multilayers. The low molecular weight PVO’s (mono-dispersed in the range of Mw=1.6×104–2×105) were labeled with energy donating and accepting probes, and these monolayers were embedded into the high molecular weight PVO layers. The energy transfer measurements provided selectively the diffusion constants (D) of the low molecular weight components in the direction normal to the layer plane. The values of D rapidly decreased with increasing the molecular weight, but leveled out for the higher Mw’s than 6×104, i.e., they became almost independent of the molecular weight. This striking effect indicates that when the size of single polymer chain becomes larger than the spatial distance examined, the relaxation of the layered structure takes place mainly by the segmental motion of polymer chains from nonequilibrium conformations confined in the two-dimensional plane.


Keyword:
Polymer Langmuir-Blodgett Film/ Energy Transfer Method/ Structural Relaxatron/ Diffusion Coefficient/ Molecular Weight Effect

Published online: April 01, 2005
© Copyright, 2005 by The Society of Polymer Science, Japan

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