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Fibers and polymers 12건

  1. [국내논문]   Photo-induced Living Cationic Polymerization of Isobutyl Vinyl Ether in the Presence of Various Combinations of Halides of Diphenyliodonium and Zinc Salts in Methylene Chloride  

    Kwon Soonhon (Department of Textile Engineering, Inha University ) , Chun Hyunjeong (Department of Textile Engineering, Inha University ) , Mah Soukil (Department of Textile Engineering, Inha University)
    Fibers and polymers v.5 no.4 ,pp. 253 - 258 , 2004 , 1229-9197 ,

    초록

    Living nature of photoinduced cationic polymerization of isobutyl vinyl ether (IBVE) in the presence of various combinations of diphenyliodonium halide (DPIX), a photocationic initiator and zinc halide $(ZnX_2)$ in methylene chloride has been investigated. Attainment of $100\%$ conversion and a linear relationship between $\%$ conversion and number average molar mass of the resulting polymer, strongly suggests the living nature of this system. Livingness of the polymerization system was observed irrespective to the type of halide anion of the initiator and zinc salts unless the reaction temperature is not higher than $-30^{\circ}C$ . The rate of polymerization decreases in the order of iodide > bromide > chloride when halide salt of DPIX and $ZnX_2$ are used. It is postulated that the cationic initiation is started by the insertion of weakly basic monomer in to the activated C-X terminal of the monomer adduct which is a reaction product of monomer and HX, a photolytic product of DPIX, formed in situ during the photo-irradiation process. It was concluded that polymerization is initiated by the insertion of weakly basic monomer into activated C- X terminal of monomer adduct due to the pulling action of $ZnX_2$ , which successively producing a new polarized C-X terminal for the propagation in cationic nature. This led us to a conclusion that the living nature of this cationic polymerization is ascribable to the polarized C-X growing terminal, which is stable enough to depress the processes of chain transfer or termination process.

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  2. [국내논문]   Acoustic Emission on Failure Analysis of Rubber-Modified Epoxy Resin   피인용횟수: 1

    Lee Deok-Bo (Reliability Analysis Research Center, Hanyang University)
    Fibers and polymers v.5 no.4 ,pp. 259 - 263 , 2004 , 1229-9197 ,

    초록

    Rubber-modified epoxy resins have been employed as adhesive and matrix materials for glass and corbon-fiber composites. The behavior of fracture around a crack tip for rubber-modified epoxy resin is investigated through the acoustic emission (AE) analysis of compact tension specimens. Damage zone and rubber particles distributed around a crack tip were observed by a polarized optical microscope and an atomic force microscope (AFM). The damage zone in front of pre-crack tip in rubber-modified specimen $(15wt\%\; rubber)$ began to form at about $13\%$ level of the fracture load and grew in size until $57\%$ load level. After that, the crack propagated in a stick-slip manner. Based on time-frequency analysis of AE signals and microscopic observation of damage zone, it was thought that AE signals with frequency bands of 0.15-0.20 MHz and 0.20­0.30 MHz were generated from cavitation in the damage zone and crack propagation, respectively.

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  3. [국내논문]   Imparting Disperse and Cationic Dyeability to Polypropylene through Melt Blending   피인용횟수: 5

    Teli M. D. (University of Mumbai, Institute of Chemical Technology ) , Adivarekar R. V. (University of Mumbai, Institute of Chemical Technology ) , Ramani V.Y. (University of Mumbai, Institute of Chemical Technology ) , Sabale A.G. (University of Mumbai, Institute of Chemical Technology)
    Fibers and polymers v.5 no.4 ,pp. 264 - 269 , 2004 , 1229-9197 ,

    초록

    The present paper deals with improvement in disperse dyeablility as well as imparting of cationic dyeablility to difficultly dyeable polypropylene by a melt blending technique. Isotactic polypropylene (PP) was blended with fibre grade polybutylene terephthalate (PBT), cationic dyeable polyethylene terephthalate (CDPET) and polystyrene (PS), individually. The resulting binary blends were spun and drawn into fibres at draw ratio 2, 2.5, and 3. The compatibility of blends, structural changes of fibres in terms of X-ray crystallinity, relative crystallinity, sonic modulus, birefringence and thermal stability were examined. The blended fibres were found to be disperse dyeable by the conventional method of high temperature and high pressure dyeing. And this dye ability increased with increase in the level of substitution. PP/CDPET blend also exhibited dyeablility with cationic dyes in addition to that with disperse dyes. The optimum level of blending was predicted keeping in view of tenacity and thermal stability of melt blend fibres. The wash fastness properties of the dyed fibres were found to be of high rate.

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  4. [국내논문]   Compatibilization of Immiscible Poly(l-lactide) and Low Density Polyethylene Blends   피인용횟수: 5

    Kim Young Fil (Department of Applied Chemical Engineering, Chonnam National University ) , Choi Chang Nam (Department of Applied Chemical Engineering, Chonnam National University ) , Kim Young Dae (Department of Applied Chemical Engineering, Chonnam National University ) , Lee Ki Young (Department of Applied Chemical Engineering, Chonnam National University ) , Lee Moo Sung (Department of Applied Chemical Engineering, Chonnam National University)
    Fibers and polymers v.5 no.4 ,pp. 270 - 274 , 2004 , 1229-9197 ,

    초록

    Blends of poly(l-lactide) (PLA) and low density polyethylene (LDPE) were prepared by melt mixing in order to improve the brittleness of PLA. A reactive compatibilizer with glycidyl methacrylate (GMA), PE-GMA, was required as a compatibilizer due to the immiscibility between PLA and LDPE. It contributes to reduce the domain size of dispersed phase and enhance the tensile properties of PLA/LDPE blends, especially for PLA matrix blends. A reaction product between PLA and PE-GMA, which was formed during melt-mixing and considered to act as a reactive compatibilizer, was characterized using $ ^1H-NMR$ spectroscopy.

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  5. [국내논문]   An Experimental Investigation of Yarn Tension in Simulated Ring Spinning  

    Tang Zheng-Xue (School of Engineering and Technology, Deakin University ) , Wang Xungai (School of Engineering and Technology, Deakin University ) , Fraser W. Barrie (School of Mathematics and Statistics, The University of Sydney ) , Wang Lijing (School of Engineering and Technology, Deakin University)
    Fibers and polymers v.5 no.4 ,pp. 275 - 279 , 2004 , 1229-9197 ,

    초록

    Yarn tension is a key factor that affects the efficiency of a ring spinning system. In this paper, a specially constructed rig, which can rotate a yam at a high speed without inserting any real twist into the yarn, was used to simulate a ring spinning process. Yarn tension was measured at the guide-eye during the simulated spinning of different yarns at various balloon heights and with varying yarn length in the balloon. The effect of balloon shape, yarn hairiness and thickness, and yam rotating speed, on the measured yarn tension, was examined. The results indicate that the collapse of balloon shape from single loop to double loop, or from double loop to triple etc, lead to sudden reduction in yarn tension. Under otherwise identical conditions, a longer length of yarn in the balloon gives a lower yarn tension at the guide-eye. In addition, thicker yarns and/or more hairy yarns generate a higher tension in the yarn, due to the increased air drag acting on the thicker or more hairy yarns.

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  6. [국내논문]   Organic Solvent Absorption Characteristics of Split-type Microfiber Fabrics   피인용횟수: 3

    Lee Kwang Ju (Department of Fiber & Polymer Engineering, Center for Advanced Functional Polymers, Hanyang University ) , Kim Seong Hun (Department of Fiber & Polymer Engineering, Center for Advanced Functional Polymers, Hanyang University ) , Oh Kyung Wha (Department of Home Economics Education, Chung-Ang University)
    Fibers and polymers v.5 no.4 ,pp. 280 - 288 , 2004 , 1229-9197 ,

    초록

    Split-type nylon/polyester microfiber and polyester microfiber fabrics possess drapeability, softness, bulkiness, and smoothness, so that they can be applied in various industrial fields. In particular, these fabrics are able to absorb various organic solvents, and can be used as clean room materials. To investigate the chemical affinity between solvents and the compositional materials of these fabrics, the contact angle of thermally pressed film fabrics was measured with different solvents. The thermally pressed nylon/polyester fabric films showed a chemical attraction to formamide. The sorption properties of the microfiber fabrics were investigated using a real time testing device, and these tests showed that the sorption behavior was more influenced by the structure of the fibrous assembly than by any chemical attraction. The effect of the fabric density, specific weight, and sample structure on the sorption capacity and rate was examined for various organic solvents. The sorption capacity was influenced by the density and the specific weight of the fibrous assembly, and knitted fabric showed a higher sorption capacity than woven fabric. However, the sorption rate was less affected in lower viscosity solvents. On applying Poiseuille's Law, the lower viscosity solvents showed higher initial sorption rates, and more easily penetrated into the fibrous assembly.

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  7. [국내논문]   Thermal Decomposition Kinetics of Copolymers Derived from p-dioxanone, L-lactide and Poly(ethylene glycol)  

    Bhattarai Narayan (Department of Advanced Organic Materials Engineering, Chonbuk National University ) , Khil Myung Seob (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 ) , Kim Kwan Woo (Department of Bionano System Engineering, Chonbuk National University)
    Fibers and polymers v.5 no.4 ,pp. 289 - 296 , 2004 , 1229-9197 ,

    초록

    The kinetic parameters, including the activation energy E, the reaction order n, and the pre-exponential factor Z, of the degradation of the copolymers based on the poly(L-lactide) (PLLA) or poly(p-dioxanone-co-L-lactide) (PDO/PLLA) and diol-terminated poly(ethylene glycol) (PEG) segments have been evaluated by the single heating methods of Friedman and Freeman-Carroll. The experimental results showed that copolymers exhibited two degradation steps under nitrogen that can be ascribed to PLLA or PDO/PLLA and PEG segments, respectively. However, copolymers exhibited almost single degradation step in air. Although the values of initial decomposition temperature were scattered, copolymers showed the lower maximum weight loss rate and degradation-activation energy in air than in nitrogen whereas the higher value of temperature at the maximum rate of weight loss was observed in air.

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  8. [국내논문]   Application of Analytic Hierarchy Process for the Selection of Cotton Fibers  

    Majumdar Abhijit (College of Textile Technology ) , Sarkar Bijan (Department of Production Engineering, Jadavpur University ) , Majumdar Prabal Kumar (College of Textile Technology)
    Fibers and polymers v.5 no.4 ,pp. 297 - 302 , 2004 , 1229-9197 ,

    초록

    In many engineering applications, the final decision is based on the evaluation of a number of alternatives in terms of a number of criteria. This problem may become very intricate when the selection criteria are expressed in terms of different units or the pertinent data are difficult to be quantified. The Analytic Hierarchy Process (AHP) is an effective way in dealing with such kind of complicated problems. Cotton fiber is selected or graded, in the spinning industries, based on several quality criteria. However, the existing selection or grading method based on Fiber quality Index (FqI) is rather crude and ambiguous. This paper presents a novel approach of cotton fiber selection using the AHP methodology of Multi Criteria Decision Making.

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  9. [국내논문]   Dyeing Properties and Colour Fastness of Cotton and Silk Fabrics Dyed with Cassia tora L. Extract   피인용횟수: 8

    Lee Young-Hee (Department of Textile Engineering, Pusan National University ) , Kim Han-Do (Department of Textile Engineering, Pusan National University)
    Fibers and polymers v.5 no.4 ,pp. 303 - 308 , 2004 , 1229-9197 ,

    초록

    A natural colorant was extracted from Cassia tara L. using buffer solutions (pH: 2-11) as extractants. The dyeing solution (Cassia tara L. extract) extracted using pH 9 buffer solution was found to give the highest K/S values of dyed fabrics. Cotton and silk fabrics were dyed with Cassia tara L. extract at $60^{\circ}C$ for 60 min with pre-treatment of various metal salts as mordants. It was found that Cassia tara L. extract was polygenetic dyestuffs and its major components were anthraquinones. Studies have been made on the effects of the kind of mordant on dyeing properties and colour fastnesses of cotton and silk fabrics. The K/S of cotton fabrics increased in the order of the dyeing using $FeSO_4 >CuSO_4> ZnSO_4> MnSO_4\cong Al_2(SO_4)_3 > NiSo_4 > none$ , however, the K/S of silk fabrics increased in the order of the dyeing using $FeSO_4 > CuSO_4 > ZnSO_4\cong Al_2(SO_4)_3 > MnSO_4\cong NiSO_4 > none$ . It was found that the K/S values of dyed fabrics were largely affected by the colour difference $(\DeltaE)$ between mordanted fabric and control fabric. However, they were not depended on the content of mordanted metal ion of the fabrics. Mordants $FeSO_4$ and CuSO_4$ for cotton fabric, $FeSO_4,\; CuSO_4,\; and\; Al_2(S0_4)_3$ for silk fabric were found to give good light fastness (rating 4).

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  10. [국내논문]   Comparison of Some Process Components of Polyester Microfibre Dyeing by Using Mathematical and Experimental Methods  

    Becerir Behcet (Uludag University, Faculty of Engineering & Architecture, Department of Textile Engineering ) , Iskender Abdulhalik (Uludag University, Faculty of Engineering & Architecture, Department of Textile Engineering)
    Fibers and polymers v.5 no.4 ,pp. 309 - 315 , 2004 , 1229-9197 ,

    초록

    In this paper, a comparison between a mathematical and an experimental method for the evaluation. of some process components of polyester microfibre dyeing is presented. In the experimental part, a dyeing procedure was chosen, K/S values of the dyed samples were measured and the coefficients of the mathematical formula presented in the mathematical part were obtained. K/S values of different dyeing procedures were also measured. In the mathematical part, predicted K/S values were calculated by a novel formula. The results of the two methods were then compared. According to the results obtained, the mathematical formula presented in this study can be used for calculating the predicted K/S values at lower dye concentrations.

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