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Fibers and polymers 15건

  1. [국내논문]   Sericin-fixed filk fiber as an immobilization support of enzyme  

    Lee, Ki Hoon , Kang, Gyung Don , Shin, Bong Seob , Park, Young Hwan
    Fibers and polymers v.6 no.1 ,pp. 1 - 5 , 2005 , 1229-9197 ,

    초록

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [국내논문]   Sericin-Fixed Silk Fiber as an Immobilization Support of Enzyme   피인용횟수: 1

    Lee Ki Hoon (School of Biological Resources and Materials Engineering, Seoul National University ) , Kang Gyung Don (School of Biological Resources and Materials Engineering, Seoul National University ) , Shin Bong Seob (Department of Textile Engineerings, Sangju National University ) , Park Young Hwan (School of Biological Resources and Materials Engineering, Seoul National University)
    Fibers and polymers v.6 no.1 ,pp. 1 - 5 , 2005 , 1229-9197 ,

    초록

    In this study, we attempted to evaluate a novel use of sericin-fixed silk fiber (SFx) as an immobilization support of enzyme. Sericin was fixed on the silk fiber using glutaraldehyde as a fixation reagent. After 6 hours of fixation, the degree of fixation increases linearly with linear decrease of the amount of bound $\alpha$ -chymotrypsin (CT). This suggests that the increase of the degree of fixation is due to the further crosslinking of free aldehyde groups on the surface of sericin-fixed silk fiber (SFx). Even though perfect fixation was not achieved, sericin did not dissolve seriously and could be removed by further washing. The specific activity did not differ significantly after 6 hours of fixation. The activity of immobilized CT on SFx decreased to its half after 6 hours of incubation at 50 $^{\circ}C$ . However, it retained $78\%$ of initial activity even after 1 hour of treat­ment with $100\%$ ethanol. As a result, the SFx could be used as an immobilization support of enzyme in non-aqueous media at ambient temperature.

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  3. [국내논문]   Surface Morphologies and Internal Fine Structures of Bast Fibers   피인용횟수: 16

    Wang H. M. (School of Engineering and Technology, Deakin University ) , Wang X. (School of Engineering and Technology, Deakin University)
    Fibers and polymers v.6 no.1 ,pp. 6 - 12 , 2005 , 1229-9197 ,

    초록

    Fiber surface morphologies and associated internal structures are closely related to its properties. Unlike other fibers including cotton, bast fibers possess transverse nodes and fissures in cross-sectional and longitudinal directions. Their morphologies and associated internal structures were anatomically examined under the scanning electron microscope. The results showed that the morphologies of the nodes and the fissures of bast fibers varied depending on the construction of the inner fibril cellular layers. The transverse nodes and fissures were formed by the folding and spiralling of the cellular layers during plant growth. The dimensions of nodes and fissures were determined by the dislocations of the cellular layers. There were also many longitudinal fissures in bast fibers. Some deep longitudinal fissures even opened the fiber lumen for a short way along the fiber. In addition, the lumen channel of the bast fibers could be disturbed or disrupted by the nodes and the spi­rals of the internal cellular layers. The existence of the transverse nodes and fissures in the bast fibers could degrade the fiber mechanical properties, whereas the longitudinal fissures may contribute to the very rapid moisture absorption and desorption.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  4. [국내논문]   Effects of In Vitro Degradation on the Weight Loss and Tensile Properties of PLA/LPCL/HPCL Blend Fibers   피인용횟수: 1

    Yoon Cheol Soo (Department of Textile Engineering, Dankook University ) , Ji Dong Sun (Department of Textile Engineering, Dankook University)
    Fibers and polymers v.6 no.1 ,pp. 13 - 18 , 2005 , 1229-9197 ,

    초록

    PLA/LPCL/HPCL blend fibers composed of poly (lactic acid) (PLA), low molecular weight poly ( $\varepsilon$ -caprolactone) (LPCL), and high molecular weight poly ( $\varepsilon$ -caprolactone) (HPCL) were prepared by melt blending and spinning for bioab­sorbable filament sutures. The effects of blending time and blend composition on the X-ray diffraction patterns and tensile properties of PLA/LPCL/HPCL blend fibers were characterized by WAXD and UTM. In addition, the effect of in vitro degra­dation on the weight loss and tensile properties of the blend fibers hydrolyzed during immersion in a phosphate buffer solu­tion at pH 7.4 and 37 $^{\circ}C$ for 1-8 weeks was investigated. The peak intensities of PLA/LPCL/HPCL blend fibers in X-ray diffraction patterns decreased with an increase of blending time and LPCL contents in the blend fibers. The weight loss of PLA/LPCL/HPCL blend fibers increased with an increase of blending time, LPCL contents, and hydrolysis time while the tensile strength and modulus of the blend fibers decreased. The tensile strength and modulus of the blend fibers were also found to be increased with an increase of HPCL contents in the blend fibers. The optimum conditions to prepare PLA/LPCL/HPCL blend fibers for bioabsorbable sutures are LPCL contents of $5 wt\% , HPCL contents of $35 wt\% , and blending time of 30 min. The strength retention of the PLA/LPCL/HPCL blend fiber prepared under optimum conditions was about $93.5\% even at hydrolysis time of 2 weeks.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  5. [국내논문]   Structure and Properties of Syndiotactic Polystyrene Fibers Prepared in High-speed Melt Spinning Process  

    Hada Yoshiaki (Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology ) , Shikuma Haruo (Idemitsu Kosan Co. Ltd. ) , Ito Hiroshi (Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology ) , Kikutani Takeshi (Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology)
    Fibers and polymers v.6 no.1 ,pp. 19 - 27 , 2005 , 1229-9197 ,

    초록

    High-speed melt spinning of syndiotactic polystyrene was carried out using high and low molecular weight poly­mers, HM s-PS and LM s-PS, at the throughput rates of 3 and 6 g/min. The effect of take-up velocity on the structure and properties of as-spun fibers was investigated. Wide angle X-ray diffraction (WAXD) patterns of the as-spun fibers revealed that the orientation-induced crystallization started to occur at the take-up velocities of 2-3 km/min. The crystal modification was a-form. Birefringence of as-spun fibers showed negative value, and the absolute value of birefringence increased with an increase in the take-up velocity. The cold crystallization temperature analyzed through the differential scanning calorimetry (OSC) decreased with an increase in the take-up velocity in the low speed region, whereas as the melting temperature increased after the on-set of orientation-induced crystallization. It was found that the fiber structure development proceeded from lower take-up velocities when the spinning conditions of higher molecular weight and lower throughput rate were adopted. The highest tensile modulus of 6.5 GPa was obtained for the fibers prepared at the spinning conditions of LM s-PS, 6 g/min and 5 km/min, whereas the highest tensile strength of 160 MPa was obtained for the HM s-PS fibers at the take-up velocity of 2 km/min. Elongation at break of as-spun fibers showed an abrupt increase, which was regarded as the brittle-duc­tile transition, in the low speed region, and subsequently decreased with an increase in the take-up velocity. There was a uni­versal relation between the thermal and mechanical properties of as-spun fibers and the birefringence of as-spun fibers when the fibers were still amorphous. The orientation-induced crystallization was found to start when the birefringence reached -0.02. After the starting of the orientation-induced crystallization, thermal and mechanical properties of as-spun fibers with similar level of birefringence varied significantly depending on the processing conditions.

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  6. [국내논문]   Effect of Enzyme Treatment and Wood Pulp Variation on Physical Characteristics and Fabric Hand of Lyocell Fabrics   피인용횟수: 2

    Ahn CheunSoon (Department of Fashion and Industry, University of Incheon ) , Yoo Hye-Ja (Department of Clothing & Textiles, Seowon University ) , Lee Hye Ja (Department of Home Economics Education, Korea National University of Education ) , Kim Jung Hee (Department of Clothing & Textiles, Seowon University ) , Song Kyung-Hun (Department of Clothing & Textiles, Paichai University ) , Rhie Jeon Sook (Department of Clothing & Textiles, Chonbuk University)
    Fibers and polymers v.6 no.1 ,pp. 28 - 34 , 2005 , 1229-9197 ,

    초록

    The purpose of the research was to examine the effect of three different levels of enzyme treatment on the physical characteristics and the end-use suitability of the lyocell fabrics made with four different types of commercial wood pulp. The appropriate enzyme concentration for obtaining an optimum as well as consistent physical characteristics and fabric hand trait was 3 g/l for the concentration levels tested in the present investigation. Weight loss was more affected by higher enzyme con­centration than other physical properties. H2 was least affected by enzyme treatment for all three physical properties and fab­ric hand. 5 g/l concentration exhibited little difference from 3 g/l in the physical characteristics, whereas the KES-FB values indicated a significant loss of fabric hand in most PHV s with the 5 g/l concentration level. Among different garment parame­ters, all four fabric types were relatively inappropriate for the men's slacks (MS) fabric due to the lower hand value of koshi required by the MS parameter. However, despite the relatively low koshi values, high fukurami values required for men's dress shirt (MWDS) resulted in the highest THV among the four garment parmeters. The four fabric types, which represent the usage of four different wood pulps, in general seem to exhibit a higher applicability to women's winter thin dress (WWTD) than women's winter suit (WWS) garment parameter.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [국내논문]   Dyeing Properties of Nylon 66 Nano Fiber with High Molecular Mass Acid Dyes  

    Lee Kwon Sun (Ecological Dyeing and Finishing Technology Team, KITECH ) , Lee Beom Soo (Ecological Dyeing and Finishing Technology Team, KITECH ) , Park Young Hwan (Ecological Dyeing and Finishing Technology Team, KITECH ) , Park Yoon Chul (Ecological Dyeing and Finishing Technology Team, KITECH ) , Kim Yong Min (Nano Science Research Institute, Nano Technic Co. ) , Jeong Sung Hoon (Department of Molecular System Engineering, Hanyang University ) , Kim Sung Dong (Department of Textile Engineering, NITRI, Konkuk University)
    Fibers and polymers v.6 no.1 ,pp. 35 - 41 , 2005 , 1229-9197 ,

    초록

    Research and development of nano fiber products is very active over the world. Physical characteristics and dyeing properties of nylon 66 nano fiber were investigated in this study. X-ray diffraction, DSC, analysis of amino end group, and water absorption were performed to get information concerning physical properties of nano fiber. Nylon 66 nano fiber was dyed with high molecular mass acid dyes. Effects of dyeing temperature, pH of dyeing solution, and concentration of acid dyes on dyeing properties such as rate of dyeing and the extent of exhaustion, were examined and compared to those of regu­lar fiber. It was found that nano fiber adsorbed acid dyes at lower temperature, got rapidly dyed, and its extents of exhaustion at specific dyeing temperature were higher than regular fiber. It was also observed that nano fiber could adsorb a large amount of acid dye without a significant loss in the extent of exhaustion. Washing fastness of the dyed nano fiber was lower by $1/2\~1$ grade, light fastness by 1 grade than the dyed regular fiber.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [국내논문]   Effects of Spinning Processes on HVI Fiber Characteristics and Spun Yarn Properties  

    Koo Hyun-Jin (FITI R&D Center, FITI Testing and Research Institute ) , Suh Moon W. (Department of Textile and Apparel Technology and Management, College of Textiles, North Carolina State University)
    Fibers and polymers v.6 no.1 ,pp. 42 - 48 , 2005 , 1229-9197 ,

    초록

    The effects of opening, carding, and repeated drawings on single fiber and bundle cotton characteristics were stud­ied by employing $Mantis^{\circledR}$ , $AFIS^{\circledR}$ and HVI Testers. Some of the significant changes in single fiber properties were found to be due to process parameters as well as the changes in the fiber crimps, parallelness of fibers within HVI beards, and the actual changes in the tensile properties of the fibers. The study showed that the HVI test data taken just prior to spinning had the highest correlation with the yam tensile properties. Based on the study results, we point out the potential of HVI for future quality and process control in spinning by recommending a set of expanded HVI output that is more scientific and compre­hensive for the future control needs.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  9. [국내논문]   Effect of Dilation on the Mechanical Characterization of Vascular Prostheses  

    Ulcay Y. (Department of Textile Engineering, College of Engineering & Architecture, University of Uludag ) , Pourdeyhimi B. (Department of Textiles, College of Textiles, North Carolina State University)
    Fibers and polymers v.6 no.1 ,pp. 49 - 54 , 2005 , 1229-9197 ,

    초록

    The purpose of this study has been to investigate the effect of dilation on the some mechanical properties of several types of warp-knitted vascular grafts. The structures of warp knit vascular grafts used in the experiments were reverse locknit, locknit, and Tricot. Various mechanical properties of these grafts were determined using devices developed for the purpose. Clinical data obtained were compared with experimental results of warp knit vascular grafts. The most important mechanical properties are found to be creep extension, bursting strengths, and compliance. Preliminary results indicate that vascular grafts are non-compliant and exhibit creep which is predictive of the long term dilation that has been noted in the clinical results. It is found that there is a positive correlation between experimental data and clinical results for at least the grafts tested.

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  10. [국내논문]   Extensible Elastica Solutions on the Large Deflection of Fiber Cantilever with Circular Wavy Crimp (I) - Derivation of Models and Their Solutions-  

    Jung Jae Ho (School of Materials Science and Technology, Department of Engineering, Seoul National University ) , Kang Tae Jin (School of Materials Science and Technology, Department of Engineering, Seoul National University)
    Fibers and polymers v.6 no.1 ,pp. 55 - 65 , 2005 , 1229-9197 ,

    초록

    Extensible elastica solutions of two-dimensional deflection of crimped fiber cantilever of circular wavy crimp were obtained for one end clamped boundary under concentrated, inclined and dead tip load Fiber was also regarded as a linear elastic material. Crimp was described as a combination of semicircular arcs smoothly connected with each other having con­stant curvature of all the same magnitude and alternative sign. Also the inclined load direction was taken into account. The solutions were expressed as the recursive forms of integrals in two different cases, which can also be transformed to elliptic integrals respectively. Comparing the data with inextensible ones was carried out. Consequently in the solution, the normal strain of neutral axis is expressed in terms of cross-sectional area, second moment of area and normalized load parameter. Examples of the circular cross-sectioned fiber are presented. As a result, the differences of normalized load between inexten­sible and extensible elastica solutions when the radius ratio becomes 0.1 were maximum $\Lambda$ 0.1.

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