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고분자 나노복합소재 내의 그래핀 나노입자 분산성에 대한 유변학적 평가
하진수,송예은,주양율,황정민,윤지선,이두진 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.1
The dispersibility of nanoparticles in polymer nanocomposites significantlyaffects the mechanical, thermal, and electrical properties of the final products. The objectiveof this study is to quantify the dispersibility of nanoparticles in polymer nanocomposites. Various amounts of graphene nanoparticles were introduced in polypropylene-basedand polylactic acid-based resins through melt compounding. They were then injectionmoldedto fabricate disc-type specimens for characterizing the rheological properties ofthe nanocomposites. To evaluate the dispersibility of the nanoparticles in the composites,the associated storage (G’) and loss (G’‘) moduli were analyzed for plotting the G’-G’‘ slopes. Furthermore, the Van Gurp-Palmen plot was employed for analyzing the increase in materialelasticity with respect to the base resins and nanoparticle compositions.
PVDF를 포함한 고분자 블렌드의 전기방사와 유변학적 특성 분석
윤병욱,송예은,김보경,주양율,김융암,이두진 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.6
The electro-spinnability of poly(vinylidne fluoride) (PVDF) solutions vary basedon the characteristics of the blended additives and solutions. In this study, we preparedPVDF-based polymer blends comprising of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP), thermoplastic polyurethane (TPU), and carbon black nanoparticles. Theelectro-spinnability of PVDF nanofibers at different polymer concentrations was analyzedusing the storage to loss moduli ratio known as the Cole-Cole plot. In addition, the vanGurp–Palmen plot, comprising of the complex modulus and phase angle, was used todescribe the polymer network behavior in the PVDF solutions.
Yeeun Song,주영준,주양율,윤병욱,신동근,Kwang-Youn Cho,이두진 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
The mobility of ion species is a critical factor for changes in crystal lattice of silicon carbides derived from polycarbosilane precursors. Here, we study the polycrystalline nanograins and their formations in silicon carbide fibers under different thermolysis conditions. We identify the rheological properties and fiber spinnability of aluminum-containing polycarbosilane precursors to elucidate the polymer networking, further polymerization, and structural rearrangement behaviors during the spinning process. The continuous and uniform jetting of the precursors is enabled within the preferable temperature ranges discovered by the storage and loss moduli plots. An enhanced network formation by further polymerization and structural rearrangement helps increase the formation of polycrystalline nanograins in the uniform-sized silicon carbide fibers.