http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
실리콘 수지 혼합비율에 따른 Pre-form 형광체 막 특성 변화에 관한 연구
박정연,윤길상,진형준,Park, Jeong Yeon,Yoon, Gil Sang,Jin, Hyoung-Joon 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.1
The effect of the viscosity of phosphor slurry prepared by mixing two types of silicone resins with different viscosities in various ratios on the properties of pre-formed phosphor films was investigated. The pre-formed phosphor films manufactured using these phosphor slurries were evaluated for curing characteristics, breaking strength, shear strength, and optical properties. The test results demonstrated that increasing the amount of high-viscosity silicone resin in the composite resin resulted in decreased curing reaction rate, decreased breaking strength, and correlated color temperature, whereas the viscosity and adhesion strength of the composite resin increased. Among seven different mixing ratios of the low- and high-viscosity silicone resins prepared for the composite resin, white-light emission was realized for the ratio 70:30, and the pre-formed phosphor film with this ratio exhibited high breaking strength and low adhesion strength. The breaking strength thus obtained was 24.0 MPa, the adhesion strength was 0.17 MPa, the color temperature was 5,650 K, and the two chromaticity coordinates (CIE(x, y) (1931)) were (0.3293, 0.3251).
Mechanical Properties of Hydrated Silk Fibroin/Bacterial Cellulose Composite Films
정리라,김예슬,진형준,Jung, Ri-Ra,Kim, Ye-Seul,Jin, Hyoung-Joon The Korean Fiber Society 2007 한국섬유공학회지 Vol.44 No.3
Composite films consisting of two biocompatible natural polymers were prepared by incorporating bacterial cellulose into silk fibroin. The high crystalline cellulose hydrogel was synthesized by bacteria, Acetobacter xylinum. Silk fibroin was finely blended with the bacterial cellulose fibrils by adding aqueous silk fibroin solution into the bacterial cellulose hydrogel. We observed individual bacterial cellulose fibrils within a silk fibroin matrix by field emission scanning electron microscopy. The silk fibroin well penetrated between the individual fibrils of the bacterial cellulose. The silk fibroin/bacterial cellulose composite film did not dissolve in water without further crystallization process, whereas a pure silk fibroin film easily dissolved in water without crystallization process. The crystallization phenomenon of silk fibroin in the composite film was verified by X-ray diffraction and Fourier transform-infrared spectroscopy. Furthermore, the mechanical properties of the silk fibroin/bacterial cellulose composite film markedly increased when the composite film was hydrated. The silk fibroin/bacterial cellulose composite films became more flexible and tougher when they were hydrated, while it was very brittle in the dehydrated state.
유리섬유 강화 플라스틱용 다중벽 탄소나노튜브/유리섬유 복합충전재의 제조
강민성,김훈식,김성택,진형준,Kang, Min-Sung,Kim, Hun-Sik,Kim, Seong-Taek,Jin, Hyoung-Joon 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3
We report a simple and mass-producible method for incorporating multiwalled carbon nanotubes (MWCNTs) on the surface of chopped glass fibers for applications to glass-fiber reinforced plastics. The MWCNTs were synthesized by thermal CVD. In order to eliminate impurities in the MWCNTs (such as metallic catalysts), the MWCNTs were treated in acid mixture (sulfuric acid/nitric acid=3:1 (v/v)) at $70^{\circ}C$ for 24 h, followed by a reflux process in 5 M HCl at $120^{\circ}C$ for 6 h. The multiple fillers, such as MWCNTs/glass fibers for reinforcement, were prepared by dipping the chopped glass fibers in a well-dispersed alcohol MWCNT solution (0.1 wt%). Field emission scanning electron microscopy showed MWCNTs generated on the microscopic glass fibers. Moreover, the MWCNTs piled up on the surface of the glass fibers with increasing absorption time. The mechanical properties of the ABS were enhanced by the incorporation of MWCNT-coated glass fibers.
전기방사에 의한 폴리아미드/다중벽 탄소나노튜브 나노복합체섬유의 제조
강민성,권순민,김돈영,김훈식,진형준,Kang, Min-Sung,Kwon, Soon-Min,Kim, Don-Young,Kim, Hun-Sik,Jin, Hyoung-Joon 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.3
This study used a new and simple processing route to incorporate multiwalled carbon nanotubes (MWCNTs) into a polymer matrix via in-situ interfacial polymerization and electrospinning. Poly(hexamethylene sebacamide) (nylon 610)/MWCNT composites were prepared using two liquid phases containing the reactants and MWCNT. One phase contained a solution of sebacoyl chloride in carbon tetrachloride and the other contained a solution of hexamethylenediamine and MWCNT in water, which was prepared by sonication with a surfactant. Electrospinning of the composite solution produced fibers with well embedded MWCNT. We investigated morphology of individual MWCNT incorporating in nylon 610 fibers by scanning electron microscopy and transmssion electron microscopy and the electrical conductivity of the electro spun nylon 610 fibers with MWCNT.
전기방사에 의한 Poly(L-lactide)/막대형 Hydroxyapatite 복합체 나노섬유의 제조
박두진,최영은,조세연,진형준,Park, Doo Jin,Choi, Youngeun,Cho, Se Youn,Jin, Hyoung-Joon 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4
Rod-like hydroxyapatites (HAs) were successfully fabricated with $CaCl_2$, $Na_2HPO_4$, and polyvinylpyrrolidone (PVP) as a stabilizer. FT-IR was used to identify rod-like HA and to observe the functional groups on the surface of HA. We conducted the turbiscan test to confirm the effects of the HA ratio on the dispersion stability in the chloroform/acetone mixture. A 3D scaffold for bone tissue regeneration was produced by electrospinning poly(L-lactide) (PLLA) with 2, 5, and 10 wt% of rod-like HAs. SEM, TEM, and XRD showed that rod-like HAs were well-embedded into the electrospun PLLA nanofibers and the mechanical properties of PLLA and PLLA/HA nanofibers were measured by UTM. Pure PLLA nanofibers had higher tensile strength than PLLA/HA nanofibers. Furthermore, 2 and 5 wt% of HAs-incorporated PLLA nanofibers showed increased Young's modulus compared to pure PLLA nanofibers because of the hardness of HA and the strong interaction between PLLA and HA by hydrogen bonds.
다이알데히드 셀룰로오스 나노크리스탈에 의해 가교된 Alkylated Graphene Oxides/Poly(vinyl alcohol) 복합필름의 배리어 특성
남정민(Jeongmin Nam),곽효원(Hyo Won Kwak),진형준(Hyoung-Joon Jin) 한국고분자학회 2021 폴리머 Vol.45 No.5
Poly(vinyl alcohol)(PVA)는 강한 분자간력으로 인해 기체 차단성이 우수하여 기체 차단 필름으로 널리 사용되고 있지만, 분자 내 고유의 친수성기로 인해 수분 차단성이 낮다는 한계가 있다. 본 연구에서는 수분 차단성을 높이기 위해 소수성 첨가제인 alkylated graphene oxide(AGO)와 친환경 가교제인 dialdehyde cellulose nanocrystal(DCNC)를 도입하여 수분 차단성이 보완된 배리어 필름을 제조하였다. 사용된 DCNC는 cellulose nanocrystal의 부분 산화를 통해 제조되었으며, 적외선 분광분석 및 X선 회절분석을 통해 다이알데히드기의 존재가 확인되었다. 열중량분석을 통해 PVA/AGO/DCNC 복합 필름의 열안정성을 측정한 결과, PVA의 수산기와 DCNC의 알데히드기간의 가교 결합을 통해 생성된 에테르 결합으로 인해 열안정성이 증가하였음을 확인하였다. Poly(ethylene terephthalate) 기재 필름 위에 코팅 후 가교된 복합 배리어 필름의 경우 550 nm에서 87.9%의 광투과도를 나타내었으며, PVA 수용액을 단독 코팅한 배리어 필름에 비해 산소 투과도는 90%, 수분 투과도는 15% 감소하였음을 확인하였다. Poly(vinyl alcohol) (PVA) has an excellent gas barrier property but its moisture barrier property is poor due to its own abundant hydroxyl groups. In this study, alkylated graphene oxide (AGO) as a hydrophobic filler and dialdehyde cellulose nanocrystal (DCNC) as a crosslinking agent, were incorporated to improve the moisture barrier property of PVA composite barrier films. DCNC was prepared through partial oxidation of cellulose nanocrystals and the presence of its dialdehyde groups was confirmed through FTIR spectroscopy and XRD analysis. The crosslinking linkage between the hydroxyl group of PVA and the aldehyde group of DCNC was confirmed through FTIR spectroscopy. The increase in thermal stability due to ether bonding was observed with TGA. The dispersion stability of the PVA/AGO/DCNC solution was also checked from the Turbiscan analysis before coating on the poly(ethylene terephthalate) substrate film. The composite barrier film decreased oxygen transmission rate by 90% and water vapor transmission rate by 15% compared to PVA barrier film.