Structural characterization of self-assembled and langmuir-blodgett films at ambient and elevated temperatures

Structural studies of Langmuir-Blodgett (LB) and self-assembled monolayers have been carried out at ambient and elevated temperatures. Spectroscopic results indicate that a high degree of orientation exists at ambient temperature which is destroyed at temperatures in excess of 150 degrees C. In the intermediate temperature range, studies show that some LB films reversibly disorder, maintaining some degree of "memory" of their initial oriented state. This turns out to be especially true for LB films of preformed polymers. Preliminary evidence suggests that flexible backbone spacer groups play a significant role in this enhanced thermal stability.In addition, recent work has focussed on the study of short chain organic molecules adsorbed on gold supported on mica by scanning tunneling microscopy (STM) and FTIR spectroscopy. Progress in this area will be updated and an assessment of the future uses of STM for studying organic molecules will be given

ACTIVE AND ADAPTIVE PHOTOCHROMIC FIBERS,TEXTILES AND MEMBRANES

A process to make a dyed fiber which has the steps of mixing a dye capable of changing color and a polymer into a solution at a temperature below the temperature at which the dye or polymer degrades to form a polymer dye solution and electrospinning said polymer dye solution to form a fiber wherein the dye penetrates more than the surface of the fiber. The invention also relates to the fiber and use of the fiber

RAMAN SPECTROSCOPY IN GUIDED OPTICAL WAVES

Nous avons obtenu et analysé les spectres Raman de polymères en films minces et de la région interfaciale entre des films de polymères lamellaires, en couplant le faisceau laser avec un guide d'onde optique par l'intermédaire d'un prisme. Des informations sur les orientations et la répartition des molécules sont obtenues en modifiant les modes et la polarisation du champ électromagnétique incident. Nous présentons les résultats concernant différents films et leurs interactions interfaciales.By coupling laser light with a prism into an optical waveguide, we have observed and analyzed Raman spectra of thin polymer films, and of the interfacial region between laminate polymer films. Both orientational and spatial informations are obtained by optical fields for different modes and polarizations. Results on various films and their interfacial interactions will be presented