A5052331597- Synthesis and properties of polymers
- Epoxy Resin Curing Processes
- Silicone and Siloxane Chemistry
- Tribology and Wear Analysis
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- Pesticide Exposure and Toxicity
- Toxic Organic Pollutants Impact
- Semiconductor materials and devices
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Perovskite Materials and Applications
- Carbon Nanotubes in Composites
- Chemical Thermodynamics and Molecular Structure
- Graphene research and applications
- Catalysis and Oxidation Reactions
- Energetic Materials and Combustion
- Radioactive element chemistry and processing
- Environmental remediation with nanomaterials
- Advanced oxidation water treatment
- Quantum Dots Synthesis And Properties
- Advanced Sensor and Energy Harvesting Materials
- Thin-Film Transistor Technologies
- Phase Equilibria and Thermodynamics
Agency for Defense Development
2015-2023
Korea Advanced Institute of Science and Technology
2011-2018
Transparent polymers that can match the optical and thermal expansion properties of glass were synthesized for flexible devices.
A new unsymmetrical diamine monomer containing two trifluoromethyl (CF3) groups is prepared from 2-bromo-5-nitro-1,3-bis(trifluoromethyl)benzene. The polymerized with typical dianhydrides, in this case PMDA, BPDA, BTDA, ODPA, and 6-FDA, using a one-pot synthetic method to obtain corresponding polyimides. All of the polyimides are readily soluble many organic solvents can be solution-cast into transparent, flexible, tough films. These films have UV–vis absorption cut-off wavelength at 340–375...
Chemical warfare agents (CWAs) are fatal to humans. Although various materials have been reported show excellent performance in the neutralization and chemical decontamination of CWAs, it is difficult directly compare their performances because they evaluated under different reaction conditions. In this study, conversion rates achieved products obtained for CWAs upon with homogeneous solutions (acting as neutralizers) same conditions systematically examined using gas chromatography. The...
High-molecular-weight poly(biphenylene oxide)s (PBPO) were prepared from AB-type monomers, 4′(3′)-hydroxy-4-nitro-2,6-bis(trifluoromethyl)biphenyl, through a meta-activated nitro displacement reaction. The of leaving group activated by the two trifluoromethyl groups at meta-position produced high-molecular-weight polymers, which implies that nucleophilic aromatic substitution reaction proceeded very effectively with activating meta-position. obtained polymers have weight-average molecular...
Soluble and transparent poly(amide-imide)s (PAIs) with a glass transition temperature over 300 °C were synthesized from the alicyclic diacid monomers containing biphenyl unit two trifluoromethyl (CF3) groups. Combination of isomeric units CF3 groups significantly improves corresponding PAIs. The increase unsymmetrical increased polymers by reducing average chain packing distance. Supporting Information Please note: publisher is not responsible for content or functionality any supporting...
ADVERTISEMENT RETURN TO ISSUEPREVNoteUnprecedented Lower Critical Solution Temperature Behavior of Polyimides in Organic MediaSun Dal Kim†, Sang Youl Kim*†, and Im Sik Chung*‡View Author Information† Department Chemistry, KAIST, Daejeon 305-701, Korea‡ Polymer & Nanomaterial Research Part, KRIBB, 305-806, Korea*E-mail: (I.S.C.) [email protected]*E-mail: (S.Y.K.) protected]Cite this: Macromolecules 2014, 47, 24, 8846–8849Publication Date (Web):December 1, 2014Publication History Received16...
A series of aromatic polyamides and polyimides containing pendent pyrazole rings with amino cyano groups were prepared from a new monomer, 1-(2,4-diaminophenyl)-3-phenyl-4-cyano-5-aminopyrazole, which was (chloromethylene)propanedinitrile 2,4-dinitrophenyl hydrazine two steps. In addition, model compounds synthesized characterized by elemental analyses, Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) spectroscopy. The on the ring not affected during polymerization...
A diamine monomer with trifluoromethyl groups, 3,3′‐bis(trifluoromethyl)‐4,4′‐diamino‐1,1′‐biphenyl, is synthesized from 5‐bromo‐2‐nitrobenzotrifluoride two steps. The model reaction monofunctional benzoyl chloride at room temperature gives the compound a quantitative yield. results of indicate that amine groups have sufficient reactivity in spite presence electron‐withdrawing and bulky group ortho position. polymerized terephthaloyl isophthaloyl N,N ‐dimethylacetamide (DMAc) or DMAc...
The decontamination ability of montmorillonite-based acid-activated clay (AACL) toward the chemical warfare agents (CWAs) mustard gas (HD), soman (GD), and venomous agent X (VX) is evaluated using chromatography–flame ionization detection (GC-FID) with internal standard calibration. Unlike HD GD, VX rapidly reacts AACL; 99.6% chemically decontaminated within 10 min. Further investigation into interaction AACL revealed that initial rate reaction depends on concentration acid surface (the...
In this study, single-walled carbon nanotubes (SWNTs) were modified with trifluoromethylated poly(phenylene oxide)s via surface-initiated chain-growth condensation polymerization (CGCP) to enhance the solubility of SWNTs in various organic solvents. The gradual increase SWNT polymer growth was monitored by color change reaction mixture and UV/Vis/NIR absorption spectroscopy. Additional Supporting Information may be found online version article. Please note: publisher is not responsible for...