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Phenoxy를 이용한 비상용성 폴리아미드 6/폴리부틸렌테레프탈레이트 블렌드의 상용화
박승빈,김진봉,이무성,Park, Seung-Bin,Kim, Jin-Bong,Lee, Moo-Sung 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.4
In this study, we investigated the compatibilizing effect of poly(hydroxy ether of bisphenol A) (phenoxy) on the immiscible blends of polyamide 6 (PA6) and poly(butylene terephthalate) (PBT). From scanning electron micrographs of PBT/PA6/phenoxy ternary blends, it was found that phenoxy forms encapsulating layer between PA6 and PBT during melt mixing. However, phenoxy does not contribute to reduce the domain size of dispersed phases, even though the encapsulating morphology results from the reduction in interfacial energy by spreading of phenoxy at the interface of PBT and PA6. The storage moduli of PBT/PA6/phenoxy blends slightly increase with phenoxy content below $T_g$ of phenoxy, but the situation is reversed above $T_g$ of phenoxy, indicating that the mechanical properties of polymer blends with encapsulating morphology depend on those of encapsulating polymers. Phenoxy added to PBT/PA6 blends does not significantly improve the tensile, bending, and impact properties of the blends, which calls into question the effectiveness of phenoxy as practical compatibilizers.
신속한 항공기 개발을 위한 통합 개념설계 프로세스에 대한 연구
박승빈,박진환,전권수,김상호,이재우,Park, Seung Bin,Park, Jin Hwan,Jeon, Kwon-Su,Kim, Sangho,Lee, Jae-Woo 한국시스템엔지니어링학회 2013 시스템엔지니어링학술지 Vol.9 No.2
Integrated aircraft synthesis process for rapid analysis and design is described in this paper. Data flow between different analysis fields is described in details. All the data are divided into several groups according to importance and source of the data. Analysis of design requirements and certification regulations is carried out to determine baseline configuration of an aircraft. Overall design process can be divided into initial sizing, conceptual and preliminary design phases. Basic data for conceptual design are obtained from initial sizing, CAD and geometry analysis. Basic data are required input for weight, aerodynamics and propulsion analyses. Results of this analysis are used for stability and control, performance, mission, and load analysis. Feasibility of design is verified based on analysis results of each discipline. Design optimization that involves integrated process for aircraft analysis is performed to determine optimum configuration of an aircraft on a conceptual design stage. The process presented in this paper was verified to be used for light aircraft design.
박승빈,박진철,조창우,송정일,Park, Seung-Bhin,Park, Jin-Chul,Cho, Chang-Woo,Song, Jung-Il 한국재료학회 2015 한국재료학회지 Vol.25 No.10
GNPs have several excellent mechanical properties including high strength, a good young's modulus, thermal conductivity, corrosion resistance, electronic shielding, etc. In this study, CF/GNP/Epoxy composites were manufactured using GNP weight ratios of 0.15 wt%, 0.3 wt%, 0.5 wt%, 0.7 wt% and 1 wt%. The composites were manufactured with a mechanical method (3-roll-mill). Tensile, impact and wear tests were performed according to ASTM standards D3039, D256 and D3181, respectively. The results show that the CF/GNP0.3wt%/Epoxy composites have good mechanical properties, e.g., tensile strength and impact and wear resistance. In this study, both carbon fabric and GNPs were used as reinforcements in the composites. The mechanical properties increased and weight loss decreased as the GNP content in the resin films was increased.