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• W100307008 abstract "Typically monolayers at the air/water (AAV) interface and Langmuir-nBlodgett (LB) films are prepared from small molecules. However a major problemnassociated with potential applications of monolayers at the AAV interface and LBnfilms from low molecular weight materials is that the films are fragile and thereforeneasily damaged. The strength of monolayers at the AAV interface and LB films cannbe improved by the incorporation of polymeric materials into the film structure. Innthis study vinyl octadecanoate (VO) was selected because of its ability to formnmonolayers at the AAV interface; to form Langmuir-Blodgett films and because itncontains a polymerizable group. The polymerization of VO in monolayers at thenAAV interface and in LB films would enhance the ability of the monolayer and LBnfilm to be used in potential applications.The first major aim was to determine the structure of insoluble monolayernfilms of vinyl octadecanoate (VO) at the AAV interface. The primary techniquesnwere the measurement of surface pressure-molecular area isotherms and reflectionabsorptionn(RA) FT-IR spectroscopy at the AAV interface. The second major aimnwas to prepare Langmuir-Blodgett (LB) films of poly(vinyl octadecanoate) (PVO)nby exposure of LB films of VO to UV radiation. The structure of LB films of VOnboth before and after exposure of the films to LTV radiation was investigated usingnRA FT-IR spectroscopy at the air/metal (A/M) interface.The monolayer of VO at the subphase temperatures of 283.2 K, 286.0 K,n292.3 K and 298.0 K exhibited densely packed phases which were characterized byna very steep rise in the surface pressure upon compression of the monolayer. In thenfour isotherms there was a phase transition from a liquid-condensed (LC) to a solidn(S) packing of the hydrocarbon chains on the aqueous surface. As the subphasentemperature was increased the surface pressure of this phase transition decreased.nIn all four isotherms there was also a phase transition from the gaseous (G) phasento the LC phase at veiy low surface pressure.Isobaric stability experiments performed on VO monolayers at the A/Wninterface at 292 K showed that the monolayer was stable at surface pressures up tonand including 15 mN m-1. Monolayer films of VO could be sustained at 15 mN m-1nfor 100 minutes with only negligible area loss. However at the higher surface pressure of 17 mN m-1 the VO monolayer showed a significant decrease in filmnarea with time when the film was held at constant surface pressure. Therefore thenmaximum surface pressure at which LB deposition could be performed to achievenhigh quality deposition was 16 mN m-1. This information was essential for theninvestigation of the structure of the VO monolayer at the AAV interface by thentechnique of reflection-absorption (RA) FT-IR spectroscopy and for thenpreparation of high quality LB films of VO.In monolayers of VO at the AAV interface the RA FT-IR spectra indicatednthat the hydrocarbon chains of the monolayer existed in a highly ordered all-transnarrangement during compression of the monolayer from very low to high surfacenpressure. Therefore in monolayers of VO the conformational order was nearlynindependent of the monolayer surface pressure. The absence of gauchenconformations even at surface pressures that corresponded to the GhLCncoexistence region was indicative of a headgroup cross-sectional area smaller thannthe area occupied by the hydrocarbon chain. In order to achieve this conformationnof the hydrocarbon chain, even at surface pressures that corresponded to thenGhLC coexistence region, the vinyl group was thought to be orientated in andirection perpendicular to the water surface.n n n n n n n n n n n" @default.
• W100307008 created "2016-06-24" @default.
• W100307008 creator A5014180361 @default.
• W100307008 date "2019-05-19" @default.
• W100307008 modified "2023-09-27" @default.
• W100307008 title "Application of FT-IR spectroscopy to the study of Langmuir and Langmuir-Blodgett films of vinyl octadecanoate" @default.
• W100307008 doi "https://doi.org/10.14264/uql.2019.359" @default.
• W100307008 hasPublicationYear "2019" @default.
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