배진영 교수

We have synthesized an amphiphilic dumbbell-shaped molecule consisting of dodeca-p-phenylene and aliphatic polyether dendrons as flexible end groups. The molecular dumbbell in aqueous solution self-assembles into well-defined left-handed helical cylinders with a diameter (8 nm) of a molecular length scale and a pitch length of 5.6 nm, as confirmed by TEM. These elementary helical fibrils are further assembled to give left-handed superhelical fibers with lengths up to several micrometers. Such a

The reactivity of the mononuclear 16-electron iridadithiolene ring complex Cp*Ir(S 2 C 2 B 10 H 10 ) ( 1 ) toward alkynes, a diazoalkane, and quadricyclane has been investigated. Reaction of 1 with an excess of alkyne resulted in the incorporation of one alkyne molecule, giving Cp*Ir[ o -BC 2 B 9 H 9 SS{ η 2 -(R 1 HC CR 2 )}- S ] ( 2: R 1 = H, R 2 = Ph, 2a; R 1 = COOCH 3, R 2 = COOCH 3, 2b ), containing a cyclometalated four-membered metallacycle ring of Ir−B−C−S and a coordinating alkenethiol g

Abstract In an effort to prepare a novel novolac phenol (NP) based char former with good solubility, the hydroxyl functionalities of NP were blocked with phenyl isocyanate (PI) via a simple urethane‐forming reaction. The chemical structure and properties of the obtained novolac phenol–phenyl isocyanate adduct (NP–PI) were characterized with gel permeation chromatography, Fourier transform infrared spectroscopy, 1 H‐NMR, and differential scanning calorimetry. Adducts of two kinds of NPs (molecula

Abstract In this article, thermally conductive and relatively low dielectric constant polymer matrix composites of an aluminum nitride filler (AlN) and a novel liquid crystalline copoly(ester amide) (LCP) were prepared via a solution blending method in the presence of a phosphate containing dispersant. The viscosities, thermal conductivities, and dielectric properties of the prepared AlN/LCP composites were investigated as a function of AlN loading. Our experimental results demonstrated that the

The synthesis and characterization of wedge−coil block molecules with a poly(ethylene oxide) coil of 77 ( 1a ), 91 ( 1b ), 114 ( 1c ), and 182 ( 1d ) ethylene oxide units are described. The self-assembling behavior of these block polymers in the melt state was investigated by optical polarized microscopy, differential scanning calorimetry (DSC), X-ray scattering measurements, and transmission electron microscopy (TEM). Block polymers self-organize from 1-D lamellar to 2-D hexagonal columnar liqu

Abstract In this article, the use of copolymeric dispersants with an acrylic backbone and epoxy side groups for formulating carbon black (CB)‐epoxy composites are described. Six epoxy‐containing acrylic copolymer dispersants were prepared from hexyl methacrylate (HMA), poly(ethylene glycol) ethyl ether methacrylate (PEGMA), and glycidyl methacrylate via a group transfer polymerization technique. The epoxy‐containing acrylic copolymer of the highest concentration of PEGMA showed a desirable passi

Abstract We report the preparation of the core/shell cadmium selenide/Zinc sulfide quantum dots (CdSe/ZnS QDs)‐silicone resin nanocomposite through the solution‐mixing method, followed by thermal hydrosilylation. After dispersing QDs into Dow Corning two‐component silicone resins (OE6630A and OE6630B at 1:4 mixing ratio by weight), the resins were cured at 150°C for 1.5 h to produce QD‐silicone resin nanocomposites. The curing behavior of the silicone resins resulting from the thermal hydrosilyl