Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Textile Science and Engineering
Journal Basic Information
Journal DOI :
The Korean Fiber Society
Editor in Chief :
Volume & Issues
Volume 41, Issue 6 - Dec 2004
Volume 41, Issue 5 - Oct 2004
Volume 41, Issue 4 - Aug 2004
Volume 41, Issue 3 - Jun 2004
Volume 41, Issue 2 - Apr 2004
Volume 41, Issue 1 - Feb 2004
Selecting the target year
Effect of an External Electric Field on the Crystallization Behavior and Crystalline Phase Transition of Poly(vinylidene fluoride)
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 1~9
In the crystallization of a commercially available 6 ㎛ thin PVDF film from the melt under an electric field, the effect of the field upon the overall crystallization rate, the nucleation rate of each crystal phase, the radial growth rate of each spherulite, the rate of transition from α-phase to γ-phase, and crystalline morphology were investigated using polarizing microscopy, infrared spectroscopy, and differential scanning calorimetry. When PVDF was crystallized at crystallization temperatures below 159℃ where only α-crystals of lamella splay type spherulites are formed, an electric field increased the rate of α-nucleation slightly, but reduced the radial growth rate somewhat. When crystallized in the temperature range of 162∼166℃, α-crystal forms dominantly along with γ-crystal in the early stage of crystallization. Both nucleation rate and radial growth rate of α-crystals decreased with increasing electric field strength, but the content of γ-crystals formed initially increased with increasing electric field. After the early stage of crystallization, a considerable amount of the α-crystals is transformed to another crystal, which is called γ'-crystal. The electric field reduced the α→γtransition rate. Even though there was little change in birefringence of spherulite after the α→γtransition, γ'-crystal appeared to be more birefringent than the γ-crystal formed initially.
Structure of the Film Prepared by Melt-Process and Deiodination of Amorphous Poly(vinyl Alcohol)-Iodine Complex
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 10~15
The iodinated poly(vinyl alcohol) (PVA) powder was prepared from 10 wt% PVA aqueous solution to which 1.5 times of I
/KI (1:2) with respect to PVA had been added, and conditioned under 50, 65, and 80%RH. Using these iodinated PVA powders, the preparation of films on a melt press was attempted at various temperatures. The fine structure of the films before and after deiodination was evaluated by thermogravimetry, X-ray diffractometry, differential scanning calorimetry and density measurement. The preparation of film on a melt-press was achieved in the temperature range of 80-13
, and the achievable minimum temperature was lower with increasing moisture regain of the conditioned powders. The TG curve for melt-pressed films showed three weight loss zones associated with degradation and evaporation of excess I
molecules and I
molecules from I
ions (zone I), partial degradation of OH side groups on PVA and I
ions (zone II), the degradation of remaining OH groups and partial degradation of main chains (zone III-1), and degradation of the remaining main chains (zone III-2). The char (zone IV) may consist of KI salts. The weight loss of the film in the second zone corresponding to the partial degradation of -OH groups was remarkably little in the case of the film prepared from the powder of the lowest moisture regain (4.4%) at the highest temperature (13
). All the films prepared on the melt-press were amorphous before deiodination, but crystalline after deiodination. The crystalline structure was identical with that of the untreated PVA. The degree of crystallinity of the film prepared from the powder of the lowest moisture regain was remarkably low.
Miscibility and Thermal Properties of PTT/PET Blends
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 16~21
Solution blends of poly(trimethylene terephthalate) (PTT) and poly(ethylene terephthalate) (PET) of various ratios were prepared and their miscibility and thermal properties were investigated. A single glass transition temperature (Tg), intermediate between those of two pure components, was observed at each composition in the PTT/PET blend system. This indicated that the blends of PTT/PET are completely miscible in the amorphous region. On the other hand, appearance of two melting points in the solution blends suggested that PTT and PET crystallize separately. With increase in heat treatment time in the melt state at 28
the two melting points became a single melting point, which decreased continuously due to the formation of copolymers. Especially, the melting point of the polymer of small content in the blends disappeared more rapidly by the transesterification reaction than that of the polymer of large content. The 50/50 PTT/PET blends converted into noncrystallizable random copolymers easily. The results also showed that in the PET-rich blends the crystallization of PTT was difficult, but in the PTT-rich blends the PET easily crystallized.
Study on the Tensile Strength and Adhesive Properties of the Copolyester for High Temperature Application
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 22~29
Thermosetting copolyester adhesives were prepared by copolymerizing p-hydroxybenzoic acid (HBA), 6-hydroxy-2-naphthoic acid (HNA) and 4-functional crosslinkable oligomers. Two different crosslinkable oligomers having four carboxylic acid or four acetoxy end groups were evaluated. The transition from thermoplastic to thermosetting character occurred when 10 wt% oligomer was added to the 73/27 HBA/HNA copolyester. Tensile strength and lap shear strength of the copolyesters have been investigated by both tensile test and adhesive test using an aluminum sheet. In the case of tensile strength of a single fiber, the values for the copolyesters containing oligomer decreased to about 90% of the 73/27 HBA/HNA fiber in the high draw ratio region while a slight decrease in tensile strength was observed in the low draw ratio region. An adhesive test using aluminum sheet revealed a decrease in the lap shear strength up to 15
for all copolyesters except the copolyester containing 10 wt% crosslinkable oligomer. Compared to 73/27 HBA/HNA copolyester, an improvement in the lap shear strength of the copolyesters containing 5 wt% oligomer was observed up to 15
. On the other hand, the copolyester containing 10 wt% crosslinkable oligomer displayed a small change in the lap shear strength with temperature.
Solution Electrospinning of Poly(hexamethylene terephthalate-co-hexamethylene 2,6-naphthalate)
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 30~36
Electrospinning of poly(hexamethylene terephthalate-co-hexamethylene 2,6-naphthalate), P(HT-co-HN), in chloroform was investigated to fabricate ultrafine fibers. Among P(HT-co-HN) copolymers of different composition, continuous ultrafine fibers were obtained only in the electrospinning of 15-18 wt% P(HT-co-HN28) solution in chloroform and the average diameters of resultant fibers were in the range of 8-10
. When small amounts of benzyl triethylammonium chloride (BTEAC) was added to the P(HT-co-HN) copolymer solutions, the beaded fibers changed into fibrous structure, and the average diameters decreased considerably. The charge density of the P(HT-co-HN) copolymer solutions was found to be a major parameter affecting the morphology and diameter of the electrospun P(HT-co-HN) fibers.
Synthesis and Characterization of N-isopropylacrylamide Copolymers for Fiber Applications
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 37~43
N-isopropylacrylamide (NIPAAm) copolymers were prepared to explore the possibilities of forming responsive fibers. Acrylic acid (AA), methacrylic acid (MAA), acrylamide (AAm), acrylonitrile (AN), methyl methacrylate (MMA), and vinyl acetate (VAc) were copolymerized with NIPAAm and the products were characterized by GPC; ¹H-NMR, IR, DSC, and TGA. Extrudates were prepared to evaluate the possibilities of utilization of the copolymers in fiber applications. The copolymerization of NIPAAm with the various comonomers at a molar feed ratio of 1 : 1 were carried out using AIBN as initiator in N,N'-dimethylformamide at a total monomer concentration of 20% (wt.). The monomer composition of the prepared copolymers evaluated by elemental analysis suggested that approximately 1 : 1 copolymers were formed in the case of poly(NIPAAm-co-AA), poly(NIPAAm-co-AAm), and poly(NIPAAm-co-MAA). The glass transition temperatures of the copolymers determined by DSC analysis were in the range, 110∼170 ℃. In the case of the copolymers having carboxylic acid groups, endothermic peaks in the range of 160∼200 ℃ appeared in the DSC thermograms, which appear to be due to anhydride formation via dehydration. Above this temperature the copolymers were stable up to 340 ℃. In the case of poly(NIPAAm-co-AA), poly(NIPAAm-co-AN), poly(NIPAAm-co-MAA), and poly(NIPAAm-co-MMA), extrudates could be prepared by injecting concentrated solutions of the copolymers into a nonsolvent coagulating bath. Among these, poly(NIPAAm-co-MAA) and poly(NIPAAm-co-AN) appear to be most promising in the preparation of PNIPAAm copolymer fibers.
The Non-fibrillation Effect of Tencel Treated with BTCA
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 44~49
The research on cross-linking of Tencel with BTCA(1,2,3,4-butanetetracarboxylic acid) which does not release formaldehyde has been widely pursued to meet increasing consumer's demand for environmental conservation and clean, brilliant surface of textiles. The purpose of this study is to control the fibrillation of Tencel by using BTCA and MgCl₂ that do not cause water pollution. Formation of ester groups suggesting increase in cross-linked portions was observed in the FT-IR spectra. Tencel treated with BTCA maintained the non-fibrillation effect even after 20 laundering cycles, as could be seen in the SEM and UV-Vis spectrophotometer data.
Evaluation of Long-Term Stability of Geogrids by Reduction Factors of Creep Deformation
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 50~55
Long-term stability of two types of geogrids were evaluated. Membrane drawn type geogrid showed an exponential increase in strength on drawing, while textile type geogrid showed sigmoidal increase. Accelerated creep test was carried out for textile type geogrid but not for membrane drawn type geogrid because of its thermal property. Creep strain for membrane drawn type geogrid was larger than the ultimate tensile strain in tensile tests. Reduction factor from creep deformation of textile type geogrid was smaller than that of membrane type geogrid. From this result, it was seen that the textile type geogrid is more stable than membrane type geogrid in creep deformation.
Analysis and Design of a Driving Mechanism for the Cam Type Dobby System
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 56~61
Cam-driven dobby mechanisms usually have complex kinematic structures such that it is a challenging task for a developer to kinematically analyze and/or design the system. Usually there exist several links and joints between the input cam and the output links, namely the heald frames of the system. One of the most important tools required for the designer is a method to generate a cam profile when the required motion of a heald frame is given. A usual method for designing a disk cam in a simple cam-follower system would not be sufficient for this case. In this study, we demonstrated a method to design a disk cam for such a complex cam driven linkage system. A commercial software ADAMS is used for the design process. The design process is illustrated through a commercial dobby system of a recent model.
Design Optimization to Enhance Mangle Roll Performance
Textile Science and Engineering, volume 41, issue 1, 2004, Pages 62~71
This is a study for the optimal design of rubber coating on a mangle roll used in the textile processing industry. The rubber coating is crowned (convex shaped) on the roll to apply even pressure on the textile. An analysis of the contact pressure on the roll surface was conducted to find the affects of the geometry of the rubber crown, the friction coefficient, the load variation at the roll and the following results were obtained. 1) The friction coefficient does not have much of an affect on the distribution of the contact pressure. 2) The optimal shape of the roll depends on the amount of the load necessary at the roll. The ratio of the rubber thickness at both ends of the roll to the center (RU1/RU2) decreased as the load increased.