Polyfluorene (PF)-based chiral alternating copolymers, i.e., PFPh and PFTh, were successfully synthesized to obtain high circular dichroism (CD) in pristine thin films.
The dyeing behavior of a novel regenerated cellulosic fiber (enVix®), prepared from secondary cellulose acetate fibers by the hydrolysis of acetyl groups, is investigated with three vat dyes. The effect of liquor ratio, temperature, and dye concentration on the dyeing properties of the enVix and viscose rayon are evaluated. The enVix exhibits better dyeability and fastness than viscose rayon, presumably due to its lower crystallinity.
We simply synthesized the triethoxysilane bearing the second-order nonlinear optical(NL0) active chromophore or chalcone derivatives. In order to improve the poor temporal stability of second-order NLO effect in sol-gel matrix, we introduced the photo-crosslink between the side chain.themselves. Photo-crosslink formation was confirmed with UV-VIS absorption and infrared vibrational spectroscopy. Under a polarized light, we investigated the decaying behavior of molecular order parameter after corona poling.
We simply synthesized the triethoxysilane bearing the second-order nonlinear optical(NL0) active chromophore in the side chain. In order to improve the poor temporal stability of second-order NLO effect, we introduced the thermal crosslink between the side chain themselves. We prepared two different silane solutions; one is composed of triethoxysilane with NLO chromophore (SGDRI) only. The other consists of SGDRI and 3-glycidoxypropyl trimethoxysilane. Thermal crosslink formation was traced with in-situ inFrared spectroscopy. We achieved much improvement of the temporal stability of second-order NLO effect utilizing this crosslinked composite system.
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