256 Result(s)
within
Yi**g Yong
Chemistry
Characterization and Evaluation of Materials
Nanochemistry
Polymer Sciences
-
Article
Preparation and electronic defect characteristics of pentacene organic field effect transistors
Organic materials have considerable attention as active semiconductors for device applications such as thin-film transistors (TFTs) and diodes. Pentacene is ap-type organic semiconducting material investigated fo...
-
Article
Zirconocene-catalyzed copolymerizations of ethylene with 5-methyl-1,4-hexadiene as non-conjugated diene
The mixtures of non-conjugated dienes, 4-methyl-1,4-hexadiene and 5-methyl-1,4-hexadiene (MHD), were successfully synthesized by the reaction of isoprene with ethylene using Fe(III)-based catalyst in toluene. ...
-
Article
Changes in facilitated transport behavior of silver polymer electrolytes by UV irradiation
Silver species other than the silver ion were formed by UV irradiation on polymer electrolyte membranes containing silver salts and their effect on complexation behavior between the silver and olefin was inves...
-
Article
Novel smart polymeric composites for thermistors and electromagnetic wave shielding effectiveness from TiC loaded styrene-butadiene rubber
The electrical conductivity during vulcanization process was measured as a function of time for the system of TiC loaded styrene-butadiene rubber (SBR) composites. The phenomenon of negative and positive tempe...
-
Article
Novel method for polystyrene reactions at low temperature
Thermal decomposition reactions of polystyrene using a new heating medium were carried out by a batch system at 190∼280 °C to clarify the manner in which decomposition is initiated. Polystyrene obtained from a...
-
Article
Thermal decomposition products of phthalates with poly(vinyl chloride) and their mutagenicity
The thermal decomposition of phthalate alone and with poly(vinyl chloride) (PVC) was carried out under a nitrogen atmosphere in a 4-necked separable flask. The thermal decomposition of phthalate in the presenc...
-
Article
Synthesis and photopolymerization of vinyl ether and epoxy-functionalized silicones
The reactive precursors, vinyl ethers, and epoxy-silicones, were synthesized. The vinyl ether monomers were prepared from primary alcohol and ethyl vinyl ether with mercury (II) acetate. The epoxy-functionaliz...
-
Article
Swelling behavior and mechanical strength of crosslinked dextran hydrogel
Dextran as a candidate material for colon-specific drug delivery has been studied. Crosslinked dextran hydrogels were prepared by mixing dextran, MgCl2, glutaraldehyde (GA) and polyethyleneglycol (PEG 400)|in wat...
-
Article
Effect of the photosensitizer on the photorefractive effect using a lowT g sol-gel glass
We prepared the photorefractive sol-gel glass based on organic-inorganic hybrid materials containing a charge transporting molecule, second-order nonlinear optical (NLO) chromophore, photosensitizer, and plast...
-
Article
Phase behavior of binary and ternary blends having the same chemical components and compositions
The phase behavior of binary blends of dimethylpolycarbonate-tetramethyl polycarbonate (DMPCTMPC) copolycarbonates and styrene-acrylonitrile (SAN) copolymers has been examined and then compared with that of DM...
-
Article
Unusual facilitated olefin transport through polymethacrylate/silver salt complexes
Silver salt complex membranes with glassy poly(methyl methacrylate) (PMMA) unexpectedly showed higher propylene permeance than those with rubbery poly(butyl methacrylate) (PBMA) where as neat PMMA is much less...
-
Article
Behavior of hepatocytes inoculated in gelatin-immobilized polyurethane foam
We have fabricated gelatin-immobilized polyurethane foams (PUFG) by dip** polyurethane foam (PUF) in an aqueous solution containing gelatin and by subsequent reaction with glutaraldehyde after freeze-drying....
-
Article
Synthesis and characterization of sulfonated polyimide polymer electrolyte membranes
Several copolyimides have been synthesized with different combinations of comonomers in order to study the relationship between conductivity and water insolubility.m-Phenylenediamine (m-PDA), an angled comonomer,...
-
Article
Evaluations of poly(vinyl alcohol)/alginate hydrogels cross-linked by γ-ray irradiation technique
In this work, we prepared hydrogels for wound dressing from a mixture of poly(vinyl alcohol) (PVA) and alginate using the60Co γ-ray irradiation technique. We examined the physical properties of these hydrogels, i...
-
Article
Silver polymer electrolyte membranes for facilitated olefint transport: carrier properties, transport mechanism and separation performance
Facilitated transport membranes for the separation of olefin/paraffin mixtures have long been of interest in separation membrane science because olefins, such as propylene and ethylene, which are important che...
-
Article
Photophysical properties of a conjugated poly(1-dodecyl-2,5-pyrrylene vinylene)
Poly(1-dodecyl-2,5-pyrrylene vinylene) (PDPV) has an extended π-conjugated structure and exhibits characteristic spectroscopic features. The PDPV we prepared has an absorption maximum at 510 nm and its long ab...
-
Article
Improvement of the biocompatibility of chitosan dermal scaffold by rigorous dry heat treatment
We have developed a rigorous heat treatment method to improve the biocompatibility of chitosan as a tissue-engineered scaffold. The chitosan scaffold was prepared by the controlled freezing and lyophilizing me...
-
Article
Sulfonated poly(ethylene glycol) containing methacrylate copolymer surfaces; preparation, characterization andin vitro biocompatibility
Poly(ethylene glycol) (PEG1K) and sulfonated PEG (PEG1K-SO3) methacrylate (MA) copolymers have been prepared and characterized. The structures of the synthesized copolymers were confirmed by1H and13C NMR spectros...
-
Article
Low-temperature decomposition of epoxy resin
We report a new method using a heating medium for the thermal decomposition of epoxy resin (EP) at temperatures ranging from 50 to 200°C. EP decomposition also occurred below 50°C during a 6-day period to gene...
-
Article
Effects of surface modification of the membrane in the ultrafiltration of waste water
An ultrafiltration membrane (polyethersulfone, PM10) was surface-modified by treating it with low-temperature plasmas of oxygen, acrylic acid (AA), acetylene, diaminocyclohexane (DACH), and hexamethyldisiloxan...
