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신휘섭,임민영,공새롬,김상완,이승원,이용훈,이종찬 한국고분자학회 2021 Macromolecular Research Vol.29 No.7
Polypropylene (PP) nanocomposites were prepared using bottom-up graphene oxide (BGO) functionalized with cardanol having a long alkyl group as a filler. BGO was prepared from citric acid and tannic acid, and then further functionalized with cardanol glycidyl ether (CGE), where CGE was synthesized by reacting cardanol with epichlorohydrin to produce cardanol functionalized BGO (CBGO). PP nanocomposites were fabricated by mixing PP and CBGO using twin-screw extruder, where the content of CBGO ranged from 0.5 to 5.0 wt%. PP nanocomposite containing 2.0 wt% of CBGO (PP/CBGO-2.0) showed the maximum mechanical properties. The effect of the alkyl group in CBGO on the mechanical properties was investigated by comparing the mechanical properties of PP/CBGO-2.0 with those of PP nanocomposite with 2.0 wt% BGO (PP/BGO-2.0). For example, the tensile strength and Young’s modulus of PP/CBGO-2.0 increased by 20.1% and 30.6%, respectively, compared to neat PP, while those of PP/BGO-2.0 increased by 14.7% and 25.0%, respectively.
김문현,신휘섭,이종찬 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Polypropylene is one of the massively produced polymers and its application has broadened the are due to relatively excellent mechanical properties, facile processability and fine chemical stability. Furthermore, the mechanical properties of polypropylene can be tuned by incorporation of various materials like carbon fiber, glass fiber, talc etc.. Nowadays, the incorporation of nanomaterials like carbon nanotube and graphene have been studied by many researchers because the nanomaterials which have large specific surface area could contribute to the enhancement of mechanical properties of polypropylene with smaller loading amount than current materials. In this research, new filler material prepared from natural resources was developed and characterized. And the enhancement of mechanical properties and thermal stability by adoption of this newly developed filler was confirmed with a series of PP composites.
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.