15 research outputs found
Fotofísica de compuestos aromáticos generadores de radiación láser y sondas de disolvente
Tesis doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Química Física Aplicada. Fecha de lectura: 24-4-199
Ring‐Banded Spherulitic Crystals of Poly(3‐butylthiophene) via Controlled Solvent Evaporation
Orientation of Regioregular Poly(3-hexylthiophene) by Directional Solidification: A Simple Method to Reveal the Semicrystalline Structure of a Conjugated Polymer
Effect of Molecular Weight on the Structure and Morphology of Oriented Thin Films of Regioregular Poly(3-hexylthiophene) Grown by Directional Epitaxial Solidification
Epitaxial Growth of Highly Oriented Fibers of Semiconducting Polymers with a Shish-Kebab-Like Superstructure
International audienceHighly oriented fibers of regioregular poly(3-alkylthiophene)s (P3ATs) showing a ldquoshish-kebabrdquo morphology are prepared by oriented epitaxial crystallization in a mixture of 1,3,5-trichlorobenzene (TCB) and pyridine. The superstructure of the P3AT fibers consists of an oriented thread-like core several hundreds of micrometers long, the ldquoshishrdquo, onto which lateral crystalline fibrils made of folded polymer chains, the ldquokebabsrdquo, are connected in a periodic way with a periodicity in the range 18-30†nm. The P3AT-chain axis is oriented parallel to the fiber axis whereas the pi-stacking direction is oriented perpendicular to it. The oriented character of the shish-kebab fibers results in polarized optical absorption and photoluminescence. The formation of oriented precursors by epitaxial orientation of polymer chains onto long needles of a molecular crystal†-†TCB in the present case†-†appears to be an original alternative to the crystallization usually performed under external flow conditions