(The) preparation and characterization of 2, 4-hexadecadienoic acid LB films

Abstract

2,4-hexadecadienoic acid(2,4-HDDA) LB films and mixed ones with SA applicable to resist material, have been studied. For the study of LB techniques, we constructed a LB trough with a constant perimeter barrier, and equipped with a vertical film deposition system. Monolayer behaviors (i.e., dissolution, π-A isotherms, stability etc.) and in situ UV-polymerizations at the air/water interface were investigated. In addition to those, the miscibilities of the mixed LB films of 2,4-HDDA and SA including in situ polymerizations were studied, and multilayers were prepared. Finally, the multilayers were characterized by use of X-ray diffraction, FTIR spectroscopy and UV spectroscopy, and then their electrical properties were measured. The major studied works as follows : Langmuir trough design : We built a Langmuir trough which is equipped with a vertical deposition system(dipper). The trough consists of a PTFE coated aluminum plate, a constant perimeer barrier and moving systems fully controlled automatically by a PC. This system can easily be adapted from one experiment to another by simply writing a new program or by modifying structure. Synthesis of 2,4-HDDA and its monolayer behaviors including in situ polymerization: We synthesized 2,4-HDDA and studied its monolayer behaviors at the air/water interface. The dissolution of the monomer into the pure water subphase was observed, and the formed monolayer films showed only the liquid expanded phase with the collapse pressure of 17 mN/m at room temperature. In situ polymerizations via UV-irradiation were studied and we could obtain very stable polymerized films. The miscibility of the mixed LB film of 2,4-HDDA and SA : Mixtures of different film-forming molecules in spread monolayer are important because of their relevance to many natural systems. The miscibilities of the mixed LB films of 2,4-HDDA and SA including in-situ UV-polymerization were investigated by investigating collapse pressures, limiting surface are...