• Title, Summary, Keyword: physical property

Search Result 1,779, Processing Time 0.043 seconds

The Physical Property of MWNT/PU Composite Films (다중벽 탄소나노튜브와 폴리우레탄 복합화 필름의 물성특성)

  • Kim, Jeong-Hyun;Park, Jun-Hyeong;Kim, Seung-Jin
    • Textile Coloration and Finishing
    • /
    • v.22 no.3
    • /
    • pp.246-256
    • /
    • 2010
  • This study studies on the physical property of MWNT/PU composite film for electrostatic dissipation (ESD) function by dispersing multi-wall carbon nanotubes (MWNT) in dimethylformamide (DMF) and by combining it with polyurethane(PU). For this purpose, four kinds of MWNT were selected and the composite films were made by dispersion processing, and their physical properties were measured and investigated in terms of electrical conductivity. For dispersion parameters, four MWNT contents(0.5, 1, 2, 5wt%) and two dispersion times(30min, 120min) were selected. The dispersion property and the electrical conductivity of MWNT/PU film was measured using a UV-Vis spectrometer and conductivity measuring apparatus. Finally, their physical properties according to the dispersion conditions were analyzed and discussed with various processing conditions.

Physical Property Evaluation of Chitosan Mordanted Green Tea Dyed Cellulose - Focusing on the physical property changes upon the repetition of treatment -

  • Jung, Hye-Kyung;Kim, Sin-Hee
    • Journal of Fashion Business
    • /
    • v.12 no.6
    • /
    • pp.61-72
    • /
    • 2008
  • The UV-protection effect of green-tea dyed fabrics was reported in our previous studies. The chitosan was used as a natural mordant of cellulose fiber for green tea extract because chitosan is a natural bio-polymer. The increase in the UV protection property of summer cellulose fabrics, cotton and linen, upon the repetition of chitosan mordanting and green tea dyeing was observed. However, the physical property change would be followed by this repeated wet processing of the cellulose fabric. Therefore, the physical changes of the chitosan mordanted and green tea dyed cotton and linen fabrics were evaluated by KES-FB system. Tensile, shear, bending, compression, and surface characteristics were tested upon the repetition of mordanting and dyeing treatments. Linearity of tensile force increased in the treated cotton and linen samples. Tensile energy and resilience decreased in all treated fabrics. Shear stiffness increased in the treated cotton and linen in general. Shear hysteresis was increased in all cotton samples and some linen samples. In cotton, the bending rigidity in all treated cottons increased except C3G3. As the chitosan mordanting numbers increased, the bending rigidity tended to decrease. In linen, the bending rigidity and hysteresis increased in all treated samples. Compressional energy and resilience increased as the number of chitosan mordanting increased both in cotton and linen. This could be the result of the increase in thickness upon chitosan mordanting. Surface coefficient of friction increased in the treated cotton and linen in general. Surface roughness tended to increase in cotton.

Comparison of Physical Properties obtained from Geophysical Well Log and Core Property Measurements in Gabsan Formation (갑산층 석회암지역에서의 코어물성과 검층물성 비교)

  • 김영화;김기주
    • The Journal of Engineering Geology
    • /
    • v.9 no.3
    • /
    • pp.253-265
    • /
    • 1999
  • Physical properties of Paleozoic sedimentary rocks in Gabsan formation in Jechon area were obtained by both geophysical well log methods and core property measurements, and the similarity and difference shown between the well log and core log responses were analyzed. The physical properties obtained are natural gamma, resistivity and density. From the difference in density response between the well log and core measurement, the need of correction for natural gamma effect on density log was strongly suggested. And fairly good correlation was obtained between well log and core properties, and among natural gamma, resistivity and density by applying natural gamma correction on density log. It is noted that shale in Gabsan formation reveals very high density, even higher than the density of adjacent non-porous limestone.

  • PDF

Physical Properties of MoS2

  • Lee, Chang-Gu
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • /
    • pp.100-100
    • /
    • 2013
  • Among recently discovered 2-dimensional materials, molybdenum disulfide has fascinating physical properties. It is atomically thin and is a semiconductor with with a similar level of bandgap with silicon. Especially, its properties get interesting when it becomes thinner. Its bandgap goes through bandgap transition from indirect to direct gap. Also its gap size increases as its thickness decreases. In this talk, I am going to present our recent work on characterization of its electrical and optical properties. We used Raman and PL spectroscopy to observe its property dependence on thickness. We fabricated electrical devices to study optimal condition for MoS2 devices. Also we synthesized large-area MoS2 films for devices applications.

  • PDF

A Study on the Sorption and Physical Properties of the BTCA Finished Cotton Fabrics (BTCA로 방추가공한 면직물의 수착 성질 및 물리적 성질의 연구)

  • 최연주;유효선
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.22 no.4
    • /
    • pp.535-542
    • /
    • 1998
  • Cotton fabrics were treated with BTCA, which is used to improve the wrinkle recovery property of cotton fabrics. BTCA, with varying its concentrations, was treated on cotton fabrics by pad dry-cure technique. BTCA contents in treated cotton fabrics were determined by the weight gain and the FT-lR spectrometer. The effects on the sorption and physical properties of BTCA treated fabrics were investigated. IR spectra showed that ester-crosslinks were produced in BTCA treated cotton fabrics. And as increasing the concentration of BTCA, ester-crosslinks are increased in amorphous regions of fabrics. Moisture regain and water imbibition of treated fabrics were reduced. But, they were increased over a certain concentration. Dye sorptions also were reduced, but they were similar over 6% BTCA. When BTCA was treated on cotton fabrics, DP rating and wrinkle recovery angle were improved. On the other hand, strength retentions of treated fabrics were lower than untreated fabrics. Stiffness was increased.

  • PDF

Physical and Chemical Properties of Silk Fiber Treated with Calcium Nitrate (질산칼슘 처리농도에 따른 수축견사의 이화학적 특성)

  • 이광길;이용우
    • Journal of Sericultural and Entomological Science
    • /
    • v.40 no.1
    • /
    • pp.70-77
    • /
    • 1998
  • This study was carried out in order to find out the relationship between physical and chemical properties of silk fiber treated by concentrated calcium nitrate solution. The tensile, thermal and dynamic mechanical properties are also examined on Ca(NO3)2 treated silk fibers. The tensile properties of silk fibers treated by calcium nitrate changed with a concentration. The thermal behavior were also affected by the concentration of calcium nitrate. The degradation temperature (endotherms) and glass transition temperature shifted to lower temperature as the treated concentration increased. It is thought that the physical properties are strongly related to the structure and morphology of Ca(NO3)2 treated silk fibers. As a result, these give property changes with a concentration dependence.

  • PDF

Physical Property of Heat Storage Knitted Fabrics for High Emotional Garment (고감성 의류용 축열 니트소재의 물성)

  • Kim, Hyun Ah;Heo, Kyoung;Kim, Seung Jin
    • Fashion & Textile Research Journal
    • /
    • v.17 no.2
    • /
    • pp.295-304
    • /
    • 2015
  • This paper investigated wear comfort property of heat storage knitted fabrics for high emotional garment. For this purpose, ZrC imbedded PET knitted fabric was prepared and various physical properties such as thermal, wicking and drying characteristics were measured. In addition, far-infrared emission characteristics of ZrC imbedded PET was analysed and tactile hand property and dye affinity of ZrC imbedded knitted fabric were also studied in comparison with regular and other commercial heat storage PET knitted fabrics. It was observed that Zr imbedded amount in the yarn was 19.29% by ingredient analysis and far-infrared emission energy was $3.65{\times}10^2W/m^2$, emissivity was 0.906 at the range of wavelength $6{\sim}20{\mu}m$. It was found that maximum heat flow (Qmax) of ZrC imbedded PET knitted fabric was lower than that of regular PET one and warmth keepability rate was higher than that of regular PET one, which means ZrC imbedded PET have heat storage property. Drying property of ZrC imbedded knitted fabric was better than that of regular PET one due to heat by far-infrared emitted from ZrC in the core of filament. It revealed that wicking property of the ZrC imbedded fabric was not influenced by far-infrared emission, but affected by fibre physical properties. Tactile hand property of ZrC imbedded knitted fabric was not influenced by imbedding ZrC in the filament but affected preferably by structure of knitted fabric. Dye affinity of ZrC imbedded PET knitted fabric was less influenced by dyeing temperature and time than regular PET knitted one.

Comparison ofrock weathering propertiesfrom mountain and valley areas of homogeneous bedrock areas (동일 기반암 지역에서 산지와 곡지 암석의 풍화 특성 비교)

  • Lee, Gwang-Ryul
    • Journal of The Geomorphological Association of Korea
    • /
    • v.23 no.1
    • /
    • pp.1-16
    • /
    • 2016
  • This study estimates relationships between physical and chemical weathering indices of various rock types and topographical relief. Physical weathering properties such as rock strength and joint and chemical weathering indices such as the $SiO_2/Al2O_3$, CIA and WPI were analyzed from 18 rock outcrops in mountain and valley areas consisting of 9 rock types. The results indicate that the elevation and relief of topography increase physical strength of rock increases. It can be suggested that the total r(rock-mass strength rating) and R(rock rebound strength by Schmidt Hammer) are most useful indices as a quantitative weathering property factor to explain formative causes of topographical relief. The results also suggest that rock types such as sandstone, granite, gneiss and schist are most suitable to explain meaningful difference in topographical relief with the physical and chemical weathering indices.

HP-GPC Analysis for Characteristics Change of Asphalt Cement Due to Aging (노화(老化)에 의한 아스팔트 시멘트 형질변화(形質變化)의 HP-GPC 분석(分析))

  • Kim, Kwang Woo;Yeon, Kyu Seok;Choi, Joong Dae
    • Journal of The Korean Society of Civil Engineers
    • /
    • v.12 no.4
    • /
    • pp.49-57
    • /
    • 1992
  • This study was conducted to evaluate physical property change of asphalt cement chromatograms (by HP-GPC) were experimentally obtained from 3 types of AC-20 virgin ACs, 5 and 24-hour artificially aged ACs, and naturally aged 4 ACs that were recovered from 4 different roads. Absolute viscosity, kinematic visoosity and penetration were the physical properties tested. THF was used for mobil phase and RI detector was used as a detector for Hp-GPC testing. Correlation between each physical property change and the chromatogram variation was evaluated. Each chromatogram was divided into ten-equal-time slices. The percentage areas of 10 slices and each physical property were used for statistical correlation evaluation. Statistical analysis results showed that eaoh physical property had a strong correlation with the chromatogram characteristics. Aging was identified as a mechanism of change of molecular size distribution - increasing large size molecules and reducing coresponding samll size molecules.

  • PDF