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가소제 함유 PVDF 나노섬유의 상용화 가능성에 관한 연구
이승훈,소윤미,장선호,심현주,김찬,Lee, Seung-Hoon,So, Yun-Mi,Jang, Seon-Ho,Shim, Hyun-Joo,Kim, Chan 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.4
The mechanical properties and softness of electrospun polyvinylidene fluoride (PVDF) nanofibers was improved by the addition of a small amount of tributyl citrate (TBC) plasticizer to PVDF spinning solutions. The PVDF nanofibers containing TBC were prepared by electrospinning and subsequent calendering. The morphology, mechanical properties, and thermal properties of the electrospun PVDF nanofibers were investigated using Field Emission Scanning Electron Microscopy (FE-SEM), tensile test and DSC analysis. The results of the tensile experiment indicate that the PVDF nanofibers containing 5 wt% of TBC have three times better strength and six times higher elongation in the mechanical direction (MD) compared to those of pure PVDF nanofibers. Thus, the results indicate that PVDF nanofibers containing TBC have potential applications not only in the textile industry but also in the electrical and biomedical fields. Further, the excellent mechanical properties and softness of the eco-friendly nanofibers containing TBC plasticizer is useful for its commercialization.
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플라즈마 처리에 의한 폴리비닐리덴플로라이드 나노섬유의 젖음성
이승훈,장선호,소윤미,이헌수,양철민,윤중현,김찬,Lee, Seung-Hoon,Jang, Seon-Ho,So, Yun-Mi,Lee, Hun-Su,Yang, Cheol-Min,Yun, Jung-hyun,Kim, Chan 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.1
Poly(vinylidene fluoride) (PVDF) is a critical polymeric material used in the mass production and application of electrospun nanofibers, and is popular due to its excellent properties. However, electrospun PVDF nanofibers are very hydrophobic and possess low surface energies, limiting their broad application. In this work, we investigated practical methods for the hydrophobic surface modification of PVDF nanofibers using four techniques: radio-frequency (RF) and PIN-type atmospheric plasmas, planar inductively coupled plasma (ICP), and planar capacitively coupled plasma (CCP). The use of RF atmospheric plasma was ineffective under the experimental conditions used, while the PIN-type atmospheric plasma efficiently modified PVDF nanofiber surfaces locally. The application of planar CCP to PVDF nanofibers was more effective than planar ICP for the same experimental conditions. In particular, the water contact angles of samples treated with planar CCP for 600 s and 900 s were $25^{\circ}$ and $10^{\circ}$ respectively, and wettability improved. Analysis with FT-IR, XPS, and FE-SEM showed that the surface CF and CH hydrophobic groups were destroyed without damaging the PVDF nanofibers, and hydrophilic species such as C=O, OH, and COOH were formed. As a consequence, quantitative analysis of nanofiber chemical composition is necessary when treated by plasmas, providing insight into the correlation of specific property changes with processing conditions, and indicating precise research results and application examples.
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Midazolam 전투약이 목표농도 조절방식으로 투여되는 Propofol과 Rocuronium 작용 발현에 미치는 영향
구의경 ( Eui Kyoung Goo ),정철희 ( Cheol Hee Jung ),김환희 ( Hwan Hee Kim ),소윤미 ( Yun Mi So ),나효석 ( Hyo Seok Na ),박희평 ( Hee Pyoung Park ),전영태 ( Young Tae Jeon ),황정원 ( Jung Won Hwang ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.57 No.4
Background: This clinical study was designed to evaluate the effect of midazolam as a premedication on the onset of propofol and rocuronium during propofol target-controlled infusion (TCI). Methods: Seventy four patients (ASA class I or II) were randomly allocated to receive either no premedication (control group) or premedication with 0.04 mg/kg intravenous midazolam (midazolam group). Anesthesia was induced and maintained with propofol TCI. Time from propofol injection to loss of consciousness (LOC) and estimated effect concentration at LOC were recorded. After LOC, rocuronium (0.6 mg/kg) was injected. We monitored the degree of neuromuscular blockade by acceleromyography. The following parameters were measured and compared between groups: Time from rocuronium injection to depression of twitch height below 25%, time to maximal depression of twitch height (defined as rocuronium onset time). Results: Systolic blood pressure before induction was lower in midazolam group (125±15 vs 135±20 mmHg), however, there was no difference in blood pressure at LOC between groups (111±16 vs 106±21 mmHg). In midazolam group, time to LOC in propofol TCI was shorter (63±22 vs. 203±118 sec) and estimated effect site concentration of propofol was significantly lower than control group (0.9±0.3 vs. 2.2±0.4 μl/ml). The onset time of rocuronium was not different between groups (120±39 vs. 137±42 sec). Conclusions: Midazolam pretreatment fastens the onset time of propofol and decreases the propofol requirement for LOC. However, it does not influence the onset of rocuronium. (Korean J Anesthesiol 2009;57:434∼7)
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