A5079450854- Synthesis and properties of polymers
- Silicone and Siloxane Chemistry
- Advanced Polymer Synthesis and Characterization
- Thin-Film Transistor Technologies
- Crystallization and Solubility Studies
- Organic Electronics and Photovoltaics
- Polymer Surface Interaction Studies
- X-ray Diffraction in Crystallography
- Advanced Sensor and Energy Harvesting Materials
- Copper Interconnects and Reliability
- Irrigation Practices and Water Management
- Epoxy Resin Curing Processes
- Polymer Nanocomposite Synthesis and Irradiation
- Polymer Nanocomposites and Properties
- Surfactants and Colloidal Systems
- Polymer crystallization and properties
- Pickering emulsions and particle stabilization
- Electrospun Nanofibers in Biomedical Applications
- Laser-Ablation Synthesis of Nanoparticles
- Hydrology and Watershed Management Studies
- Additive Manufacturing and 3D Printing Technologies
- Nanowire Synthesis and Applications
- Block Copolymer Self-Assembly
- Mesoporous Materials and Catalysis
- Surface Modification and Superhydrophobicity
Korea Research Institute of Chemical Technology
2022-2025
Korea Advanced Institute of Science and Technology
2006-2024
Korea Institute of Materials Science
2023
Daewoo Shipbuilding and Marine Engineering (South Korea)
2021
Daejeon University
2014-2020
Government of the Republic of Korea
2018
Institute for Basic Science
2017
SK Group (South Korea)
2014
Momentive (United States)
2014
Kia Motors (South Korea)
2011-2012
Few studies aiming to develop a glue with an underwater reusable adhesive property have been reported because combining the two properties of adhesion and into single formulation is challenging issue. Herein, preparation simple mixture poly(vinyl alcohol) (PVA) well-known phenolic compound, namely, tannic acid (TA), results in exhibiting adhesion. We named VATA (PVA + TA). Using VATA, stainless steel objects (0.77 kg each) are able be instantly attached. In addition high strength,...
Transparent polymers that can match the optical and thermal expansion properties of glass were synthesized for flexible devices.
The water-borne aromatic poly(amic acid) salt (W-PAASs) is gaining attention as an eco-friendly approach to synthesizing precursors for high-performance polyimide (PI) materials. However, widening the versatility of chemical structure in monomers tuning novel physical properties resulting polymers remains challenging. In this study, we introduce a surfactant-assisted, one-pot synthesis W-PAASs, efficient broadening diversity PI precursors. surfactant effectively increases interface...
Here, we proposed an eco-friendly synthetic method for synthesizing hybrid composites with ultralow dielectric properties at high frequencies up to 28 GHz true 5G communication from aqueous aromatic polyimide (PI) polymers and dual-porous silica nanoparticles (DPS). The "one-step" water-based emulsion template was used synthesize the macroporous (MPS). A substantially negative ζ potential produced along surface of MPS by poly(vinylpyrrolidone)-based chemical functionalization, enabling...
Abstract Matrix Metalloproteinases (MMPs) are crucial enzymes for ultraviolet irradiation‐induced photoaging in human skin. Ultraviolet B (UVB) stimulates dermal fibroblasts to increase MMP‐1 and ‐3 expression extracellular matrix (ECM) degradation photoaging. We investigated whether phosphatase tensin homolog (PTEN)/Akt pathway is involved secretions of fibroblasts. The secretion occurred along with the PTEN Akt phosphorylation by UVB irradiation a dose‐ time‐dependent manner. However,...
We report the preparation of hierarchically porous polymers containing fully interconnected and controlled micro-, meso-, macropores, where a hyper-cross-linked microporous polymer skeleton forms reticulating mesoporous wall that supports highly macropore framework. These materials provide high specific surface area >90% porosity, useful for rapid sorption organic molecules.
A water-borne photo-sensitive poly(amic acid) salt for the micropatterned polyimide layer of a microelectronic device.
Macroporous polymers have gained significant attention due to their unique mass transport and size-selective properties. In this study, we focused on Polyimide (PI), a high-performance polymer, as an ideal candidate for macroporous structures. Despite various attempts create PI (Macro PI) using emulsion templates, challenges remained, including limited chemical diversity poor control over pore size porosity. To address these issues, systematically investigated the role of poly(amic acid)...
This study presents a novel approach that enables an environmentally benign water-based co-solvent synthesis of fluorinated polyimides (FPIs) using conventional fluorine-based monomers such as 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,2′-bis(trifluoromethyl)benzidine (TFMB). The high surface tension inherent in materials, which inhibits water solubility, can be overcome by mixing with alcohol-based solvent. the decreases proportionally alcohol content, facilitating...
Low-dielectric polymer materials are becoming essential for 5 G mobile communication to achieve mass transport information without signal loss. Herein, we present an aliphatic–aromatic copolyimide using Priamine 1075 (aliphatic) and m-tolidine (aromatic) as diamines. The branched bulky aliphatic units enlarge the free volume, effectively reducing dipole moment density, while aromatic diamine was introduced prevent chain relaxation under operating conditions. We observed that there is optimal...
Bioadhesives are becoming an essential and important ingredient in medical science. Despite numerous reports, developing adhesive materials that combine strong adhesion, biocompatibility, biodegradation remains a challenging task. Here, we present biocompatible yet biodegradable block copolymer-based waterborne superglue leads to application of follicle-free hair transplantation. Our design strategy bridges self-assembled, temperature-sensitive copolymer nanostructures with tannic acid as...
Manufacturing strategies to create three-dimensional (3D) structures with multifunctional nanomaterials are of intense interest for fabricating building blocks in many electromechanical applications. A coil spring composed graphene provides an important step toward the realization all-carbon devices, as it is one essential elements a wide range systems. In this connection, here unprecedented fabrication strategy new type 3D laser-induced springs (LIG-S) which spontaneously produced via...
For stable battery operation of silicon (Si)-based anodes, utilizing cross-linked three-dimensional (3D) network binders has emerged as an effective strategy to mitigate significant volume fluctuations Si particles. In the design binders, careful selection appropriate cross-linking agents is crucial maintaining a balance between robustness and functionality network. Herein, we strategically optimize 3D binder through comprehensive analysis agents. The proposed composed poly(vinyl alcohol)...
Melanoma is a highly metastatic cancer resistant to current chemotherapeutic and radiotherapeutic approaches. Several studies have shown that interactions between cells the extracellular matrix (ECM) are critical for survival invasion of cells. In this study, we examine effects methylselenol generated from selenomethionine (SeMet) by methioninase (METase) on cell proliferation, adhesion, expression integrins in murine melanoma B16F10 cells, which lungs syngeneic C57BL/6J mice. Combined...
Top-illuminated flexible polymer solar cells with 3D micoresonant cavity provide not only powerful light-trapping but also electrical enhancement, resulting in significant enhancement of power efficiency (26.4%). Capping layer (CL) enhanced the transmittance transparent electrodes, increasing electric field intensity photoactive by forming microresonant cavity, and nano-pattern on rear electrodes caused to Jsc improving light absorption charge collection.
Abstract Here, the utilization of a highly uniform water‐borne polyimide (W‐PI) thin film as gate dielectric layer for large‐scale organic transistors (OTFTs) exceeding 100 cm 2 is presented, employing bar‐coating technique. The W‐PI films are obtained uniformly over large area by systematically manipulating surface tension water‐soluble poly(amic acid) salts (W‐PAAS) solution using alcohol co‐solvent in “Green” process. thickness precisely controlled within range tens to hundreds nanometers...
Highly efficient plasmonic Ag rear electrodes in top-illuminated PSCs employing MoO3/Ag (13 nm)/MoO3 stacks as top transparent were successfully demonstrated, resulting the significant enhancement of solar cell performance with a PCE up to 7.18%. The hemispherical nanostructured arrays effectively concentrate incident light within photoactive layer addition contributing extended stability robust structure.
Copolymerizing a cross-linker in the PISA process spontaneously produces branched core cross-linked block polymer micelles.
Randomness is perceived in two different extremes, macroscopic homogeneity and local heterogeneity, but apparently far away from order. Here we show that a periodic order spontaneously arises binary random copolymer when self-assembly occurs an ensemble containing > 10
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...
We used plasma-enhanced chemical vapor deposition (PECVD) of allyltrimethylsilane (ATMS), consisting an allyl group along with three methyl groups attached to silicon, form a low dielectric constant (low-k) and high modulus SiCOH matrix. found that the mechanical properties low-k material are strongly affected by selection precursor, processing conditions such as temperature post-treatment, introduction second labile phase, structure composition films. After porogen (pore generator)...
Hyper-cross-linking of a core block polymer micelles produces cross-linked with spacious hyper-cross-linked core, which is solution-processible.