Orientational disordering transition in Langmuir-Blodgett films of fluorinated polymers

A thermally induced disordering transition of molecular orientation in polymeric Langmuir-Blodgett (LB) films is observed with a nonlinear optical probe--second-harmonic generation (SHG). The LB films consist of alternate monolayers of a SHG-active polyacrylate and a buffering polyoxazoline. The obs...

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Bibliographic Details
Published in:Langmuir 1993-08, Vol.9 (8), p.1971-1973
Main Authors: Hsiung, H, Beckerbauer, R, Rodriguez-Parada, J. M
Format: Article
Language:English
Subjects:
Applied sciences
Chemistry
Exact sciences and technology
General and physical chemistry
Langmuir blodgett films
Miscellaneous
Organic polymers
Physicochemistry of polymers
Properties and characterization
Surface physical chemistry
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Summary:A thermally induced disordering transition of molecular orientation in polymeric Langmuir-Blodgett (LB) films is observed with a nonlinear optical probe--second-harmonic generation (SHG). The LB films consist of alternate monolayers of a SHG-active polyacrylate and a buffering polyoxazoline. The observed disordering transition appears to be dominated by intralayer thermal relaxation of the active polymer, rather than the interlayer interactions between the active polymer and the buffer polymer. Furthermore, we find that the transition kinetics can be described with an Arrhenius rate equation, with a high apparent activation energy indicative of a collective relaxation process.
ISSN:0743-7463
1520-5827
DOI:10.1021/la00032a010