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서희란,공새롬,신휘섭,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
hexagonal boron nitride nanosheets grafted with aliphatic groups (Alkyl-BN) were synthesized by a sonication-assisted alcoholysis reaction using hexagonal boron nitride (hBN) with 1-dodecanol, and a series of polypropylene (PP) nanocomposites were prepared by mixing PP with different amount of Alkyl-BN. The PP/Alkyl-BN nanocomposite containing a very small amount of Alkyl-BN showed much improved mechanical properties than those of neat PP and PP/hBN nanocomposites. For instance, Young's modulus value and tensile strength of PP/Alkyl-BN nanocomposite containing 0.5 wt.% of Alkyl-BN are larger than that of neat PP by 17.5 % and 7.4 %, respectively due to the enhanced interfacial interaction between Alkyl-BN and PP chains. Furthermore, the PP/Alkyl-BN nanocomposites exhibited enhanced thermal conductivity and stability than the neat PP and PP/hBN nanocomposite.
서희란,공새롬,정경화,김문현,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Thin-film nanocomposite (TFN) membranes with carbon nanotubes (CNTs) are known to exhibit higher water permeability than conventional thin-film composite (TFC) membranes. However, due to the poor dispersion stability of CNTs to organic phase, it has always been dispersed only in aqueous phase in oxidized form during the interfacial polymerization (IP). The aim of this study was to increase the dispersion stability of CNTs to the organic solvent by synthesizing octadecylamine- grafted partially unzipped carbon nanotube (PUCNT-C18), and to prepare TFN membrane using PUCNT-C18 as a filler of organic phase to maximize the manifestation of the properties of CNTs. PUCNT-C18 was systematically characterized by FT-IR, XPS, TGA, TEM, and XRD. The TFN with PUCNT-C18 showed much higher pure water flux than TFC, which was comparable to that of TFN with oxidized CNT. These results indicate that controlling the position of nanomaterials could be used to improve the performance of TFN membrane.
서희란,백지훈,이시영,궁찬영,조경화,김진석,김상완,육진솔,이종찬 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Phenol-formaldehyde resins were prepared through the reaction of nonylphenol, 3-pentadecylphenol (PDP), cashew nut shell liquid (CNSL) and cardanol with paraformaldehyde under acidic conditions. The molar mass and structural characteristics of the synthesized polymer were analyzed. The novolacs using CNSL and cardanol had higher molar mass, which is attributed to cross-linking probability of CNSL and cardanol with unsaturated bonds. Then, the antibacterial property of synthesized novolacs was examined. Against the E. coli., the novolac synthesized from cardanol showed 97% or more of antibacterial property and the same is true for the novolac from PDP. In the case of novolacs from nonylphenol and CNSL showed a relatively low antibacterial property of 85%. Comprehensive analysis of the results shows that the prepared novolacs can be used as antibacterial coating materials.
서희란,신휘섭,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Cellulose nanocrystal (CNC) is the product of acid assisted hydrolysis of cellulose. During the hydrolysis process, the amorphous parts of cellulose are removed, and the crystalline parts are left. There are various functional groups on the surface of remaining crystalline part, but the most abundant group is hydroxyl group. 3-Pentadecylphenol (PDP) which is a reduced form of cardanol has single phenol group. To change the hydrophilic surface property of CNC, the surface was functionalized with derivative of PDP which was reacted with succinic anhydride. The derivative of PDP (PDPBA) was analyzed with NMR. The functionalization of CNC was conducted by acid catalyzed esterification between CNC and PDPBA. The functionalization was successful and confirmed by EA, FT-IR and TGA. In the future work, PP composites containing functionalized and pristine CNC are going to be fabricated to investigate the effect of functionalization on the mechanical and thermal properties of PP composites.
서희란,공새롬,정경화,김문현,이종찬 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Thin-film nanocomposite (TFN) membranes with carbon nanotubes (CNTs) are known to show higher water permeability than existing thin-film composite (TFC) membranes. However, CNTs has the poor dispersion stability to most of solvents. Thus, in this study, CNT was modified to have high dispersion stability in the organic solvent which is used to fabricate TFN membranes. First, CNT was oxidized to partially unzipped carbon nanotube (PUCNT) and then alkyl chain was grafted on the PUCNT using octadecylamine. TFN membrane fabricated by incorporating PUCNT-C18 as a nanofiller of organic phase allowed more nanofillers to be exposed to the surface than TFN membranes with oxidized CNT (OCNT). As a results, TFN with PUCNT-C18 showed outstanding pure water flux and chlorine resistance compared to the TFC and TFN with OCNT. These results indicate that controlling the position of nanomaterials could improve the performance of TFN membrane.