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Preparation of helically compartmentalized microcylinders by electrohydrodynamic method
길만재,문성준,이경진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Helical morphology is extraordinarily interesting by itself, and observations of the morphologies, properties and physical and chemical behaviors of helical structures can provide crucial clues to understanding nature`s secrets. However, manufacture of multicompartmental micro building block with spiral patterns is challenging task. In this study, micro building block polymer with helical internal architecture was prepared through the EHD co jetting followed by twisting procedure. Spiral shape could have been controlled by adjusting the twisting process. Helical microcylinders were obtained by cryo-sectioning of microfiber bundles and these microcylinders could be shape-shifted to microspheres which had distinct compartmentalization and unique microstructures. These techniques can provide versatile methods to prepare helical microstructures, and allow extending to mimic biological micro-creatures.
Synthesis of novel metal ion containing monomers and polymers
길만재,차상호,이경진 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Metal ion containing polymer materials have attained great attention in recent years, because these hybrid species have great potential in many application fields such as electronics, catalysis and bio-mimicking sciences. On the other hand, there has been limited information in terms of material diversity, because most of metal-ion containing polymers have been depended on porphyrin or ferrocene based metal source, which is relatively less accessible for general industry. In this study, novel type of metal ion containing monomers and corresponding polymers (or copolymers) are prepared using 1,5-cyclooctadiene (COD) ligand. Ag methacrylate was initially prepared by AgNO3 and sodium methacrylate in water, and a silver methacrylate complex (Ag [CH<sub>2</sub>=C(CH<sub>3</sub>)COO-](COD)) was obtained by addition of COD ligand on the solution. The silver methacrylate complex has been co-polymerized with MMA through a radical polymerization using AIBN. This method can provide simple and novel way to prepare diverse metal ion containing polymers.
Synthesis and characterization of methacrylic co-polymers containing silver ion
길만재,김효진,차상호,이경진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
It is difficult to prepare polymeric materials with highly dispersed metal nanoparticle because of their intrinsic low affinity. In this study, to overcome this problem, polymers containing various metal ions were synthesized through polymerization of synthetic monomers having transition metal coordinated with organic ligand (cyclooctadiene (COD). A silver methacrylate complex (Ag [CH<sub>2</sub>=C(CH<sub>3</sub>)COO-](COD)) was prepared by ligand (COD) incorporation. The silver methacrylate complex has been co-polymerized with MMA, through a radical initiator polymerization using AIBN in order to adjust their processbility in various organic solvents. The synthetic polymer can be utilized as polymeric ink for direct writing on FDA-TFDV film for possible applications in preparation of transparent conductive thin film.
Preparation of silver containing methacrylate co-polymers and their application
길만재,김영진,이경진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Metal ion containing polymer materials have attracted much attention in recent years, because these hybrid composites have great potential in many application fields. However, it is difficult to prepare polymeric materials with highly dispersed metal moieties because of their intrinsic low affinity. To overcome this problem, polymers containing metal ions were synthesized through polymerization of synthetic monomers having transition metal coordinated with organic ligand (cyclooctadiene (COD)). When Silver methacrylate was manufactured for radical co-polymerization with MMA(methyl methacrylate), it added COD because silver methacrylate was dissolved in THF solvent. Microfibers with Ag containing co-polymers through electrospun on transparent substrate can provide potential application fields such as transparent electrode.
Preparation of copper containing nanocomposite film with layer-by-layer process
김효진,길만재,박현주,이경진,차상호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Organic-inorganic nanocomposite has received much attention because it has potential application fields with their multi-functionality. However, affinity between organic and inorganic substance is intrinsically weak to generate homogenous mixture which is crucial for their properties. In this study, organic/inorganic multi-layered thin film was prepared by layer-by-layer deposition of organic polymer containing copper precursor and poly(amic acid). Localized copper precursor in the thin films was converted to copper metal through electron beam irradiation. Electron beam irradiation influenced on imidization of poly(amic acid) as well. This method can be extended to produce well-defined nanocomposites with diverse metal nanomaterials.
김효진,길만재,차상호,이경진 한국고분자학회 2018 Macromolecular Research Vol.26 No.5
Nanocomposites with homogeneous dispersion of metal species have attained great attention due to their potential applications in various fields. Here, copper ion containing methacrylate copolymers were prepared by polymerization of copper methacrylate complex. The copper ion containing hybrid nanocomposite films were fabricated by layer-by-layer (LBL) assembly of copper ion containing methacrylate copolymers and transparent polyamic acid (PAA). LBL process was carried out with spin-assisted coating of PAA and dip-coating of copper ion containing methacrylate copolymers. The copper ion containing composite films were modified by thermal treatment and e-beam irradiation to reduce metal ions, resulting in higher mechanical properties. Modulus of modified copper metal-organic hybrid composite films was investigated by nano-indentation experiment.