title: Polarized fluorescence microscopy analysis of patterned, polymerized perfluorotetradecanoic acid-pentacosadiynoic acid thin films.
abstract: Photoillumination of mixed films comprised of the photopolymerizable fatty acid 10,12 pentacosadiynoic acid and perfluorotetradecanoic acid deposited onto glass substrates gives rise to the formation of oriented polydiacetylene photopolymer fibers. The degree of polymer fiber orientation was investigated using dual-view, polarized fluorescence microscopy of the polydiacetylene, which allowed for characterization of individual fluorescent polymer fibers after photopolymerization, as well as comparison of the orientation of different fibers within the same sample. Measurements indicated that individual fibers consisted of multiple photopolymer strands with various orientations, and that there was a preferred orientation for fibers in the film as a whole. The fibers were preferentially oriented at an angle of approximately 60° to the direction of film compression during deposition from a Langmuir trough, with orientation being the result of mechanical stress exerted by the compression barriers coupled with rotation of the polymer fibers during film draining. These measurements were complemented with conventional "bulk" fluorescence polarization experiments, and compared with mixed film structures described previously for these systems at the air-water interface using Brewster angle microscopy.
authors.affiliation: Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada.
authors.forename: Hessamaddin Younesi
authors.initials: HY
authors.lastname: Araghi
authors.affiliation: Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada.
authors.forename: Neeraj K
authors.initials: NK
authors.lastname: Giri
authors.affiliation: Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada. Electronic address: matthew.paige@usask.ca.
authors.forename: Matthew F
authors.initials: MF
authors.lastname: Paige
mesh_terms: D005231:Fatty Acids, Unsaturated / Q000737:chemistry*; D005466:Fluorocarbons / Q000737:chemistry*; D008856:Microscopy, Fluorescence; D008859:Microscopy, Polarization; D009227:Myristic Acids / Q000737:chemistry*; D000078789:Polyacetylene Polymer; D011091:Polyesters / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000737:chemistry; D053279:Polyynes / Q000737:chemistry
chemical_list: C493048:10, 12-pentacosadiynoic acid; D005231:Fatty Acids, Unsaturated; D005466:Fluorocarbons; D009227:Myristic Acids; D000078789:Polyacetylene Polymer; D011091:Polyesters; D011108:Polymers; C500738:poly(10,12-pentacosadiynoic acid); D053279:Polyynes; C082361:polydiacetylene
keywords: 10,12 Pentacosadiynoic acid; Anisotropy; Fluorescence microscopy; Perfluorotetradecanoic acid; Polarization; Polydiacetylene