• Title/Summary/Keyword: textile materials

Search Result 1,430, Processing Time 0.03 seconds

Study of HOMO and LUMO Energy Levels for Spirolactam Ring Moiety Using Electrochemical Approach

  • Kim, Hyungjoo;Lee, Sehoon;Son, Young-A
    • Textile Coloration and Finishing
    • /
    • v.25 no.2
    • /
    • pp.83-88
    • /
    • 2013
  • Rhodamine dyes have been studied in various scientific areas due to their excellent photophysical properties. In particular, these rhodamine dyes are one of the most famous fluorophores as signal unit in chemosensor study. This is related to spirolactam ring system in rhodamine dyes. When the spirolactam ring is closed, there is nonfluorescence and colorless. Whereas, ring-opening of the corresponding spirolactam induces strong fluorescence and color. These absorption and emission changes are related to structural changes as well as electron energy potential levels such as HOMO and LUMO values. In this study, two different structures of rhodamine 6G hydrazide depending on the spirolactam ring system were investigated using absorption measurement, electrochemical measurement and computational calculations.

Interfaces Between Rubber and Metallic or Textile Tire Cords

  • Ooij Wim J. Van;Luo Shijian;Jayaseelan Senthil K,
    • Elastomers and Composites
    • /
    • v.34 no.4
    • /
    • pp.299-314
    • /
    • 1999
  • Bonding metal and textile components to rubber has always posed a problem. In this paper, an attempt had been made to modify textile and metal surfaces for bonding with rubber. The metal surfaces were modified using silane coupling agents and textile fibers were modified using plasma polymerization techniques. Some results on adhesion of metals to a range of sulfur-cured rubber compounds using a combination of organofunctional silanes are given here. The treatment was not only effective for high-sulfur compounds but also for low-sulfur com pounds as used in engine mounts and even for some semi-EV compounds. Coatings of plasmapolymerized pyrrole or acetylene were deposited on aramid and polyester tire cords. Standard pull-out force adhesion measurements were used to determine adhesion of tire cords to rubber compounds. The plasma coatings were characterized by various techniques and the performance results are explained in an interpenetrating network model.

  • PDF

A study on simplified Textile testing apparatus for teaching high school students (중고등학교 피복재료 학습효과를 높이기 위한 시험장치 개발에 관한 연구)

  • 장경연
    • Journal of the Korean Home Economics Association
    • /
    • v.26 no.2
    • /
    • pp.69-79
    • /
    • 1988
  • This study was to increase the experimental learning effect of textile materials in middle and high school. To this study, three kinds of simply devised apparatus were used for warmth retaining test, air permeability test and static electricity test. Two classes were chosen in a girls' high school comparing learning effect and classified the theoretical learning group and the experimental learning group. In the experimental group, a teaching plan to teach the properties of textile materials was made to use these apparatuses. The results were. 1. In the interest on the unit either the theoretical learning group or the experimental learning group were not different significantly. 2. In the items facilitation of motivation, unsatisfied desires and prevention of failure, effect of transfer and development of inquiry power, both groups were significant. 3. For the purpose of comparing the learning effect, two groups were examined for determining the level of understanding after teaching properties of textile materials. The mean value of the experimental learning group was higher than that of the theoretical learning group. The experimental learning group had more higher markers(over the point of 90) than the theoretical learning group.

  • PDF

A Study on the Weight Loss Treatment and Characteristics of Nylon 6 Fiber (나일론 6 섬유의 감량가공 및 특성 연구)

  • Lim, Sung Chan;Lee, Hyun Woo;Lee, Hyun Jae;Won, Jong Sung;Jin, Da Young;Lee, Seung Goo
    • Textile Coloration and Finishing
    • /
    • v.27 no.3
    • /
    • pp.175-183
    • /
    • 2015
  • Weight loss treatment of a fiber leads an improvement of its handle and drape properties. Hydrolysis of a fiber is commonly known as a method to reduce its weight of 5-40%. Most of the studies on the weight loss treatment are mainly based on polyester fibers and there has been almost no study on the weight reduction of nylon fibers. In this study, however, in order to develop a use of nylon 6 fiber for the industrial applications such as toothbrush, underwear, carpet and more, weight loss treatment of a nylon 6 fiber was carried out. Under various treatment conditions, morphological analysis were done to observe the change in the structure of the surface and analysis. From the observation of formic acid treated nylon 6 fiber, there were many etched and deformed morphologies. Thermal and crystalline properties were analyzed to find the changes in the crystal structure caused by the weight loss treatment. There were little differences in the crystalline properties of nylon 6 fiber by formic acid treatment. Tensile strength of nylon 6 fiber decreases with acid concentration. The FITR peak intensity of the amide bond decreases with formic acid concentration.

Study on the TiO2-Ag Nanoparticle Coated PET Fabric with an Atomizer (아토마이저를 이용한 PET 직물의 TiO2-Ag 나노입자 코팅 연구)

  • Lee, Hyun Woo;Hong, Tae Min;Son, Han-Geul;Lim, Sung Chan;Shin, Weon Gyu;Lee, Seung Goo
    • Textile Coloration and Finishing
    • /
    • v.26 no.2
    • /
    • pp.99-105
    • /
    • 2014
  • In this study, $TiO_2$ and Ag powders were deposited on the PET fabric using an atomizer in order to study the characteristics of particle deposited fabric. To improve the particle deposition, the surface of the fabric was pre-treated with an electron beam and its effect was studied with the deposition of those elements on the fabric. The SEM was used to observe the morphology of the deposition fabric and through the EDS analysis, the deposition of $TiO_2$ and Ag was confirmed. Also, the absorbance of the particle deposited fabric was measured using the Methylene Blue to verify the photolysis nature of $TiO_2$. Moreover, the antibiotic nature of Ag on the surface of the PET fabric was identified through the antibiosis test.

Effect of Silane Coupling Agent on the Interfacial Adhesion and Mechanical Properties of Polyketone Fiber Reinforced Epoxy Composites (실란커플링제 처리가 폴리케톤섬유/에폭시 복합재료의 계면접착성 및 물성에 미치는 영향)

  • Jo, Hani;Yang, Jee-Woo;Lim, Hyeon Soo;Oh, Woo Jin;Lee, Seung Goo
    • Textile Coloration and Finishing
    • /
    • v.29 no.2
    • /
    • pp.77-85
    • /
    • 2017
  • The interfacial adhesion between fiber and matrix affects the physical properties of fiber reinforced composites. In this study, 3-(Methacryloyloxy)propyltrimethoxy silane(MPS) coupling agent was used to increase the interfacial adhesion between polyketone fiber and epoxy resin. The change of surface chemical composition of polyketone fiber treated with MPS was analyzed using a FTIR-ATR. The interfacial bonding between fiber and resin increased with silane coupling agent largely. Consequently, interfacial shear strength(IFSS) was enhanced with increasing concentration of MPS coupling agent and thus, the physical properties of the composites such as flexural properties and dynamic mechanical properties were changed. Flexural strength and modulus increased when the MPS concentration was higher than 0.5wt%. The dynamic storage modulus of Polyketone/Epoxy composites treated with MPS was higher than that of the untreated one. When the MPS concentration of 3wt%, the highest storage modulus was obtained.

Study on the Mechanical Properties of Hybridized Carbon Fiber Composite According to Stacking Structure (하이브리드 탄소섬유 적층구조에 따른 복합재료의 기계적 특성 연구)

  • Koo, Seon Woong;Oh, Woo Jin;Won, Jong Sung;Lee, Ha Ram;Youn, Ju Young;Lee, Seung Goo
    • Textile Coloration and Finishing
    • /
    • v.30 no.4
    • /
    • pp.313-320
    • /
    • 2018
  • As carbon fiber reinforced composites(CFRP) are widely used in aerospace, automobile, marine, and sports goods applications, they have been studied extensively by various researchers. However, CFRP have been pointed out because of machining problems such as delamination and burr phenomenons. Especially, hole machining process, drilling, has non-smooth features on inlet and outlet surfaces of drilled hole. This kind of machining problem can be controlled to some extent by using high modulus pitch-CF, which has considerable effects on fracture behavior of composite compared with only PAN CF composite. Therefore, PAN and pitch hybridized CF composites were prepared having high strength and modulus. The results demonstrate that the hybrid CFRP specimens with pitch CF offer the good potential to enhance modulus as well as strength properties. Dynamic mechanical, flexural, and impact properties were measured and analyzed. Morphological surface of the composites were also observed by IFS-28, canon after hole machining.

A Study on Fashion Textile Trend and Characteristics in the 1980s (1980년대 패션에 나타난 텍스타일의 경향과 특징에 관한 연구)

  • 염혜정
    • Journal of the Korean Society of Costume
    • /
    • v.41
    • /
    • pp.117-138
    • /
    • 1998
  • This study can be divied into three major sections: 1. Background on the 1980s : The 1980s can be characterized as a era of rising expectations over the quality of life. Interest in art, history, culture, and new technology increased to appeal to a greater audience. In fashion, these changes led to greater focus on quality and unique stylishness as fashion represented a medium through which luxury and refined tastes could be expressed. 2. Textile Trends of the 80s Divided into 4 Periods : The period of 1980-82 saw the mixture of natural lines with constructive lines. The textiles used in fashions in this period can be characterized by natural materials, mannish materials of the 1950s, feminine materials of the 1920s and 30s, and spoty materials of the 1960s. The period of 1983-85 was an avante garde period which used rustic avante-garde materials and art craft materials. The period of 1986-87 can be described as minimalistic and neo-classical which incorporated materials which represents a metropolitan feel, retro decorative materials and sporty, futuristic mat-erials. Lastly, the period of 1988-89 produced ethnic and natural fashions which relied on traditional British materials, country elegant and innocent look fabrics, ethinic and ecology-minded materials, in addition to comfortable and sports casual materials. 3. Characteristrics and methods of expression for textiles in the 1980s, : In the 1980s, the development of textiles have can be divided into 4 distinct patterns: decorative materials, sporty materials. In generals textiles have increased in their decorative nature-especially decoration by texure. Textile have also incorporated the mixture of contrasting themes in order to create new fabrics.

  • PDF

Antimicrobial Agents and Applications on Polymeric Materials (고분자재료에 대한 항균성 물질과 적용)

  • Lee, Jae-Woong
    • Textile Coloration and Finishing
    • /
    • v.20 no.3
    • /
    • pp.39-56
    • /
    • 2008
  • A wide variety of materials including aldehydes, cationic agents, alcohols, peroxygens, phenols and chlorinated phenols, metal ions are being employed as biocides. Among three levels for biocidal functions (sanitization, disinfection and sterilization), disinfection is an enough level for antimicrobial textiles. In terms of antimicrobial agents for textile applications, quaternary ammonium salts (QAS), chitosan, metal and metal salts, N-halamine based materials are developed with numerous research and the positive ions of those materials may result in disinfection of microorganisms. Photocatalysts, especially titanium dioxide (titania) produces the hydroxyl radical (${\cdot}\;OH$) which causes inactivation of microorganisms after UV radiation, have been used for antimicrobial applications.

Tetracycline-incorporated Silk Fibroin Films

  • Kim, Jong-Ho;Shin, Bong-Seob;Jeon, Jong-Young;Kweon, Hae-Yong;Jo, You-Young;Lee, Heui-Sam;Lee, Kwang-Gill
    • International Journal of Industrial Entomology and Biomaterials
    • /
    • v.25 no.1
    • /
    • pp.129-132
    • /
    • 2012
  • Silk fibroin films incorporated with tetracycline was prepared and characterized by Fourier-transform infrared spectrometer and differential scanning calorimeter and examined antibacterial effect. The conformation of silk fibroin was changed from random coil to $\hat{a}$ sheet structure with incorporation of tetracycline. Antibacterial activity of the materials was evaluated against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus epidermis, and Staphylococcus aures) using agar plate method showing clear inhibition zone around tetracycline silk film. It is concluded that tetracycline-incorporated SF films are highly effective against bacteria.