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Fibers and polymers 15건

  1. [국내논문]   Preparation of Regenerated Cellulose Fiber via Carbonation (II) - Spinning and Characterization -  

    Oh Sang Youn (Department of Textile Engineering, Chonnam National University ) , Yoo Dong Il (Department of Textile Engineering, Chonnam National University ) , Shin Younsook (Department of Textile Engineering, Chonbuk National University ) , Kim Hak Yong (Department of Textile Engineering, Chonbuk National University ) , Kim Hwan Chul (Department of Textile Engineering, Chonbuk National University ) , Chung Yong Sik (Department of Textile Engineering, Chonbuk National University ) , Park Won Ho (Department of Textile Engineering, Chungnam National University ) , Youk Ji Ho (Department of Textile Engineering, Inha University)
    Fibers and polymers v.6 no.2 ,pp. 95 - 102 , 2005 , 1229-9197 ,

    초록

    Sodium cellulose carbonate (CC-Na) dissolved in $8.5\;wt\%$ NaOH/ZnO (100/2-3, w/w) aqueous solution was spun into some acidic coagulant systems. Diameter of regenerated cellulose fibers obtained was in the range of $15-50\;{\mu}m$ . Serrated or circular cross sectional views were obtained by controlling salt concentration or acidity in the acid/salt/water coagulant systems. Velocity ratio of take-up to spinning was controlled up to 4/1 with increasing spinning velocity from 5 to 40 m/min. Skin structure of was developed at lower acidity or higher concentration of coagulants. Fineness, tenacity and elongation of the regenerated cellulose fibers were in the range of 1.5-27 denier, 1.2-2.2 g/d, and $8-11.3\;\%$ , respectively. All of CC-Na and cellulose fibers spun from CC-Na exhibited cellulose II crystalline structure. Crystallinity index was increased with increasing take-up speed.

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  2. [국내논문]   Rheological and Thermal Properties of Acrylonitrile-Acrylamide Copolymers: Influence of Polymerization Temperature  

    Wu Xueping (Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences ) , Lu Chunxiang (Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences ) , Wu Gangping (Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences ) , Zhang Rui (College of Chemical Engineering, East China University of Science and Technology ) , Ling Licheng (College of Chemical Engineering, East China University of Science and Technology)
    Fibers and polymers v.6 no.2 ,pp. 103 - 107 , 2005 , 1229-9197 ,

    초록

    An attempt was made to correlate the polymerization temperature and rheological and thermal properties of acrylonitrile (AN)-acrylamide (AM) copolymers. The copolymers were synthesized at different polymerization temperature. The copolymer structure was characterized by gel permeation chromatography (GPC) and Infrared spectrum (IR). The rheological and thermal properties were investigated by a viscometer and differential scanning calorimeter-thermogrametric (DSC-TG) analysis, respectively. When the polymerization temperature increased from $41^{\circ}C\;to\;65^{\circ}C$ , the molecular weight $(\bar{M}_w)$ of copolymers decreased from 1,090,000 to 250,000, while its conversion increased from $18\%\;to\;63\%$ , and the polymer composition changed slightly. To meet the requirements of carbon fibers, the rheological and thermal properties of products were also investigated. It was found that the relationship between viscosity and $\bar{M}_w$ was nonlinear and the viscosity index (n) decreased from 3.13 to 2.69, when the solution temperature increased from $30^{\circ}C\;to\;65^{\circ}C$ . This suggests the dependence of viscosity upon $\bar{M}_w$ is higher at lower solution temperature. According to the result of activation energy, the sensivity of viscosity to solution temperature is higher for AN-AM copolymers synthesized at higher polymerization temperature. The result of thermal analysis shows that the copolymers obtained at higher polymerization temperature are easier to cyclization evidenced from lower initiation temperature. The weight loss behavior changed irregularly with polymerization temperature due to irregular change of liberation heat.

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  3. [국내논문]   Properties of Polyacrylonitrile/Single Wall Carbon Nanotube Composite Films Prepared in Nitric Acid   피인용횟수: 2

    Kim Seong Hoon (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology ) , Min Byung Gil (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology ) , Lee Sang Cheol (School of Advanced Materials and System Engineering, Kumoh National Institute of Technology)
    Fibers and polymers v.6 no.2 ,pp. 108 - 112 , 2005 , 1229-9197 ,

    초록

    Nanocomposite films were prepared by casting the solution of polyacrylonitrile (PAN) and single wall nanotube (SWNT) in nitric acid subsequent to sonication. Even though SWNT shows good dispersion visually, the reinforcing effect was not satisfactory. The G-band Raman spectra of the drawn film clearly demonstrated that SWNTs in the film are well-oriented along the drawing axis of the film. The electrical resistivity of the film prepared using nitric acid was lower than that of the film using DMF. Thus, nitric acid is presumably more effective in dispersing nanotubes than DMF.

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  4. [국내논문]   Helium/Oxygen Atmospheric Pressure Plasma Treatment on Poly(ethylene terephthalate) and Poly(trimethylene terephthalate) Knitted Fabrics: Comparison of Low-stress Mechanical/Surface Chemical Properties   피인용횟수: 1

    Hwang Yoon Joong (CSIRO Textile and Fibre Technology ) , McCord Marian G. (Department of Textile Engineering, Chemistry and Science, College of Textiles, North Carolina State University ) , Kang Bok Choon (Department of Textile Engineering, Inha University)
    Fibers and polymers v.6 no.2 ,pp. 113 - 120 , 2005 , 1229-9197 ,

    초록

    Helium-oxygen plasma treatments were conducted to modify poly(trimethylene terephthalate) (PIT) and poly(ethylene terephthalate) (PET) warp knitted fabrics under atmospheric pressure. Lubricant and contamination removals by plasma etching effect were examined by weight loss $(\%)$ measurements and scanning electron microscopy (SEM) analysis. Surface oxidation by plasma treatments was revealed by x-ray photoelectron spectroscopy (XPS) analyses, resulting in formation of hydrophilic groups and moisture regain $(\%)$ enhancement. Low-stress mechanical properties (evaluated by Kawabata evaluation system) and bulk properties (air permeability and bust strength) were enhanced by plasma treatment. Increasing interfiber and interyarn frictions might play important roles in enhancing surface property changes by plasma etching effect, and then changing low-stress mechanical properties and bulk properties for both fabrics.

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  5. [국내논문]   Effects of Blend Ratio and Heat Treatment on the Properties of the Electrospun Poly(ethylene terephthlate) Nonwovens  

    Kim Kwan Woo (Department of Bionano System Engineering, Chonbuk National University ) , Lee Keun Hyung (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Lee Bong Seok (Department of Textile Engineering, Chonbuk National University ) , Ho Yo Seung (Department of Textile Engineering, Chonbuk National University ) , Oh Seung Jin (Department of Textile Engineering, Chonbuk National University ) , Kim Hak Yong (Department of Textile Engineering, Chonbuk National University)
    Fibers and polymers v.6 no.2 ,pp. 121 - 126 , 2005 , 1229-9197 ,

    초록

    Semicrystalline poly(ethylene terephthalate) (cPET)/amorphous poly(ethylene terephthalate) with isophthalic acid (aPET) blends with 100/0, 75/25, 50/50, 25/75, and 0/100 by weight ratios were dissolved in a mixture of trifluoroacetic acid (TFA)/methylene chloride (MC) (50/50, v/v) and electrospun via the electrospinning technique. Solution properties such as solution viscosity, surface tension and electric conductivity were determined. The solution viscosity slightly decreased as aPET content increased, while there was no difference in surface tension with respect to aPET composition. The characteristics of the electro spun cPET/aPET blend nonwovens were investigated in terms of their morphology, pore size and gas permeability. All these measurements were carried out before and after heat treatment for various blend weight ratios. The average diameter of the fibers decreased with increasing aPET composition due to the decrease in viscosity. Also, the morphology of the electrospun cPET/aPET blend nonwovens was changed by heat treatment. The pore size and pore size distribution varied greatly from a few nanometers to a few microns. The gas permeability after heat treatment was lower than that before heat treatment because of the change of the morphology.

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  6. [국내논문]   Intrinsic UV Reflection and Fluorescence Studies for Water Sorption in Polycarbonate, Polyurethane and Poly(Ethylene Terephthalate) Films  

    Kim Min Sun (Textile Materials Division, Korea Institute of Industrial Technology ) , Sung Chong Sook Paik (Department of Chemistry, Polymer Program, Institute of Materials Science, University of Connecticut)
    Fibers and polymers v.6 no.2 ,pp. 127 - 130 , 2005 , 1229-9197 ,

    초록

    Intrinsic UV reflection and fluorescence behaviors of polycarbonate, polyurethane and poly(ethylene terephthalate) films were investigated in order to characterize the interaction of water in these films. During water sorption process, UV reflection spectra of polycarbonate and polyurethane films showed little peak position changes. Fluorescence emission spectra of polycarbonate films showed red spectral shifts from 332 nm with water immersion time. This red-shifted peak could be due to phenyl-2-phenoxybenzoate, which is one of the major thermal degradation products in polycarbonate. Fluorescence peaks of polyurethane films appeared at two different positions and the ratio of these peak intensities increased with increasing immersion time. In the case of PET films, the UV reflection spectrum showed the peak intensity around 340 nm to change in response to water sorption. The fluorescence near 388 nm probably due to ground state dimer exhibited sensitivity with water sorption, when excited at 340 nm.

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  7. [국내논문]   Constitutive Equations for Dilute Bubble Suspensions and Rheological Behavior in Simple Shear and Uniaxial Elongational Flow Fields  

    Seo Dongjin (School of Materials Science and Engineering, Seoul National University ) , Youn Jae Ryoun (School of Materials Science and Engineering, Seoul National University)
    Fibers and polymers v.6 no.2 ,pp. 131 - 138 , 2005 , 1229-9197 ,

    초록

    A theoretical model is proposed in order to investigate rheological behavior of bubble suspension with large deformation. Theoretical constitutive equations for dilute bubble suspensions are derived by applying a deformation theory of ellipsoidal droplet [1] to a phenomenological suspension theory [2]. The rate of deformation tensor within the bubble and the time evolution of interface tensor are predicted by applying the proposed constitutive equations, which have two free fitting parameters. The transient and steady rheological properties of dilute bubble suspensions are studied for several capillary numbers (Ca) under simple shear flow and uniaxial elongational flow fields. The retraction force of the bubble caused by the interfacial tension increases as bubbles undergo deformation. The transient and steady relative viscosity decreases as Ca increases. The normal stress difference (NSD) under the simple shear has the largest value when Ca is around 1 and the ratio Of the first NSD to the second NSD has the value of 3/4 for large Ca but 2 for small Ca. In the uniaxial elongational flow, the elongational viscosity is three times as large as the shear viscosity like the Newtonian fluid.

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  8. [국내논문]   A Study and Investigation on the Influence of Static and Dynamic Loading on the Properties of Handmade Persian Carpet (I) - The Effect of Static Loading -  

    Mirjalili S. A. (Department of Textile Engineering, Yazd University ) , Sharzehee M. (Department of Textile Engineering, Yazd University)
    Fibers and polymers v.6 no.2 ,pp. 139 - 145 , 2005 , 1229-9197 ,

    초록

    The paper reports the physical and mechanical properties of hand-woven carpets, which have been put under static force. Two groups of wool fibres, from two parts of Iran, were prepared to spin pile yams for the carpets. Each group of the fibres included both conventional and tanned wool. Then two yam counts, $N_m$ = 4/2 4/2 and 6/2, were spun for two different knot densities. After weaving the carpets, they were put under static force and their thickness variations were measured and plotted against time, in logarithm scale. The resiliency of the carpets piles after eliminating the static force, were measured and plotted against time, in logarithm scale, too. The results were compared to each other and analysed with respect to parameters such as the type and quality of the wool fibres as well as knot density of the carpets.

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  9. [국내논문]   Dynamic Friction of Polyester Air-jet Textured Yarns   피인용횟수: 1

    Rengasamy Raju Seenivasan (Department of Textile Technology, Indian Institute of Technology ) , Guruprasad Raghavendran (Department of Textile Technology, Indian Institute of Technology ) , Asis Patnaik (Department of Textile Technology, Indian Institute of Technology)
    Fibers and polymers v.6 no.2 ,pp. 146 - 150 , 2005 , 1229-9197 ,

    초록

    In this paper, friction of air-jet textured yams is investigated. Using a friction measuring apparatus fabricated inhouse, dynamic friction forces of the yams under yarn-to-metal (YM) and yam-to-yam (YY) rubbing modes are measured. The influence of processing variables of air-jet texturing viz., overfeed, air pressure, dry/wet texturing and normal/core-and-effect texturing on dynamic friction is analysed. The results indicate that friction force increases with increasing rubbing speeds and yam input tension. YM dynamic friction decreases initially and then starts to increase at higher overfeeds. YY dynamic friction increases with increasing overfeed. YM dynamic friction decreases with an increase in air pressure while an opposite trend is observed for YY friction. Wet textured yams have higher friction than dry textured yams. Core wetted coreand-effect textured yams have higher friction than normal textured yams.

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  10. [국내논문]   Design of traverse cam for yarn winding on twisting machine  

    Kim, Jong-Soo , Yoon, Ho-Eop , Kim, Dae-Won
    Fibers and polymers v.6 no.2 ,pp. 151 - 155 , 2005 , 1229-9197 ,

    초록

    In this paper, friction of air-jet textured yams is investigated. Using a friction measuring apparatus fabricated inhouse, dynamic friction forces of the yams under yarn-to-metal (YM) and yam-to-yam (YY) rubbing modes are measured. The influence of processing variables of air-jet texturing viz., overfeed, air pressure, dry/wet texturing and normal/core-and-effect texturing on dynamic friction is analysed. The results indicate that friction force increases with increasing rubbing speeds and yam input tension. YM dynamic friction decreases initially and then starts to increase at higher overfeeds. YY dynamic friction increases with increasing overfeed. YM dynamic friction decreases with an increase in air pressure while an opposite trend is observed for YY friction. Wet textured yams have higher friction than dry textured yams. Core wetted coreand-effect textured yams have higher friction than normal textured yams.

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