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Nylon 6-ran-Nylon 4 공중합물 섬유의 구조와 물성 (I)
조현혹,전주완,이민희,이선희,권순택,Cho, Hyun-Hok,Jeon, Ju-Wan,Lee, Min-Hee,Lee, Sun-Hee,Kwon, Soon-Taek 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3
The effects of drawing on the structure and physical properties of nylon 6-ran-nylon 4 copolymer filaments were assessed by uniaxially drawing filaments at various ratios at 90 DC and measuring their crystal structure, birefringence, moisture regain, dynamic viscoelasticity, thermal behavior, and tensile properties. X-ray diffraction curves showed sharper peaks with increasing draw ratio. Birefringence and heats of fusion (${\Delta}H_m$) increased with increasing draw ratio, while a slight decrease in moisture regain was observed. The intensity of the $tan{\delta}$ peak decreased and its position shifted towards higher temperatures with increasing draw ratio. Breaking strength increased and breaking elongation decreased with increasing draw ratio.
Nylon 6-ran-Nylon 4 공중합물 필름의 연신 및 승온에 따른 세 방향의 결정구조 변화
조현혹,이민희,김관용,이선희,노환권,Cho, Hyun-Hok,Lee, Min-Hee,Kim, Gwan-Yong,Lee, Sun-Hee,Noh, Hwan-Kwon 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.2
In order to study the crystal structures of Nylon 4 copolymer films by elevating temperature and shooting Xray along the three principal directions (through, edge, and end directions), HT (high temperature) WAXD (wide angle X-ray diffraction) was used. Three conclusions were derived from this work. First, the diffraction intensity of samples was strongest in the edge direction. Also, the diffraction intensity became stronger as the draw ratio increased. Second, the Brill transition appeared at $140^{\circ}C$, which indicates that two peaks merged into one peak within the X-ray diffraction intensity graph. Finally, after cooling the specimen for 24 hours, the WAXD data returned to the same initial state.
폴리에틸렌 섬유의 고속방사에 따른 구조와 물성(II) -선상저밀도 폴리에틸렌의 MFR의 영향-
조현혹,김경효,Cho, Hyun-Hok,Kim, Kyoung-Hou 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.5
Fibers of linear low density polyethylene(LLDPE) having melt flow rate 45 and 50 (g/10 min), which were polymerized by metallocene catalyst and Ziegler-Natta catalyst, respectively, were produced by high speed melt spinning method in the range of take-up velocity from 1 to 6 km/min. The change of fiber structure and physical properties with increasing take-up velocity was investigated through the birefringence, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), Rheovibron, and Fafegraph-M. The birefringence increased linearly with increasing take-up velocity, and that of LLDPE(45) was higher than LLDPE(50). With increasing take-up velocity, the crystal orientation of LLDPE transformed a-axis orientation into caxis orientation. In dynamic viscoelastic behavior of LLDPE(45) fibers by the high speed spinning, the intensity of crystalline relaxation peak was decreased and crystalline relaxation temperature shifted to lower. But that of LLDPE(50) cannot be observed. Tensile strength and initial modulus were increased and elongation was decreased with increasing take-up velocity. LLDPE(45) fibers was preferred to LLDPE(50) in mechanical properties because of increment of crystal and amorphous orientation factor. The change of birefringence with take-up velocity was closely related to both initial modulus and tenacity uniformly.
나일론 4 공중합물 소재의 구조와 물성 (II) -열처리 온도에 따른 영향-
이선희,조현혹,Lee, Sun-Hee,Cho, Hyun-Hok 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.6
Nylon 6-ran-nylon 4 (100/0), (80/20), (70/30) films were prepared by using melt pressing methods. The (N6- ran-N4) films were annealed in the silicon oil bath at 50, 75, 100, 125 and $150^{\circ}C$. The film properties were examined by WAXD, DSC, DMTA and moisture regain. The crystal structure in (N6-ran-N4) films increases the annealing temperature. This is very similar to the alpha phase of nylon 6. The thermal property of (N6-ran-N4) films annealed under high temperature exhibits an increase in the melting temperature and enthalpy. The moisture regain of (N6-ran-N4) films decreased when the annealing temperature was increased.
나일론 4 공중합물 소재의 구조와 물성 (1)-연신 속도에 따른 영향-
이선희,조현혹,Lee, Sun-Hee,Cho, Hyun-Hok 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.2
Nylon 6(N6) and nylon 6(80)-ran-nylon 4(20) (N6-ran-N4) films were prepared using melt pressing methods. The N6-ran-N4 films were drawn uniaxially at various drawing speeds at $125^{\circ}C$, and the film properties were examined by WAXD, DSC, and DMTA. The crystal structure in the N6-ran-N4 films as the drawing speed increased became very similar to the alpha phase of N6. The thermal property of the N6-ran-N4 films prepared with increasing drawing speeds indicated an increasing melting temperature and enthalpy.
이선희,조현혹,Lee, Sun-Hee,Nakayama, Kazuo,Cho, Hyun-Hok The Korean Fiber Society 2007 한국섬유공학회지 Vol.44 No.6
The purpose of this study is to determine a structural explanation for the improved ability of PBT for biaxial orientation at the temperature range of $100{\sim}180^{\circ}C$. In order to investigate the crystal structure and orientation, PBT films with biaxial and uniaxial stretching are examined using WAXD, MOA, etc. Thermal properties are confirmed by DMTA, DSC and mechanical properties are investigated using sonic propagation method and tensile tester. In WAXD results, original PBT films exhibit only ${\alpha}$-form crystallites, while biaxially stretched films show (100) of the ${\alpha}$-crystal phase with increased stretching temperatures. In MOA patterns, original and biaxially stretched PBT films show an isotropic pattern in the film plane. The planarity of the film increases with simultaneous transverse stretching and stretching temperature.
열이력에 따른 Poly(ethylene 2,6-naphthalene dicarboxylate) 섬유의 미세구조와 물성
김준희,조현혹,Kim Joon Hee,Cho Hyun Hok 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.1
PEN fibers spun at 4 km/min by melt-spinning were treated by high tension annealing (HTA) at $220^{\circ}C$. The as-spun PEN fibers and fibers treated by HTA at $220^{\circ}C$ were given various thermal history. The fine structure and physical properties of the PEN fibers were investigated with various techniques such as wide-angle X-ray diffraction, DSC thermograms, density, birefringence, dynamic viscroelasticity, tensile testing, etc$\ldots$ In case of the PEN fibers treated by HTA at $220^{\circ}C$, change with thermal history could not be detected from WAXD diagrams and DSC thermograms. In the case of dynamic viscoelasticity of PEN fibers treated by HTA, storage modulus decreased with thermal history. Also, birefringence and initial modulus of the PEN fibers treated by HTA decreased rapidly. Therefore, orientation of non-crystalline region is lowered. From tilting WAXD diagrams, in case of $6^{\circ}$ tilting, peaks became bigger with thormal history. Thus, thermal history affect not only the non-crystalline region but also the crystalline region. WAXD diagrams of PEN fibers at different temperatures from $23^{\circ}C\;to\;220^{\circ}C$ suggested that only d-spacing of $\beta$ form crystal increased. But the d-spacing of transformed $\alpha$ form crystal did not change. Also d-spacing returned to the original value on cooling.
나일론 4 공중합물 소재의 구조와 물성(III) -나일론 4 함량의 영향-
이선희,조현혹,Lee, Sun Hee,Cho, Hyun Hok 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.4
The effects of annealing on the fine structure and moisture regain of nylon 4 copolymer films were investigated in terms of the content of nylon 4. Nylon 6-ran-nylon 4 (50/50), (30/70), and (0/100) films were prepared using melt pressing and solution casting methods, respectively. The (N6-ran-N4) copolymer films were annealed in a silicon oil bath at 50, 75, 100, 125 and $150^{\circ}C$, and the properties of resultant film were examined by WAXD, DSC, DMTA and moisture regain. The crystal structure in (N6-ran-N4)(50/50) and (30/70) films with increasing annealing temperature was very similar to the gamma phase of nylon 6. The thermal property of (N6-ran-N4)(50/50) and (30/70) films annealed under high temperature exhibit an increase in melting temperature and enthlapy. The result of the tan ${\delta}$ behavior of (N6-ran-N4)(0/100) film was confirmed to the appearance of two ${\alpha}$ transition peaks. The moisture regain of (N6-ran-N4) copolymer films, except in the case of (N6-ranN4)(30/70) films, decreased when the annealing temperature was increased.
고장력 열처리한 Poly(ethylene 2,6-naphthalene dicarboxylate) 섬유의 미세구조와 물성
김준희,조현혹,Kim Joon Hee,Cho Hyun Hok 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.1
PEN fibers spun at 4 km/min by high speed melt-spinning were treated by two methods, constant length annealing (CLA) and high tension annealing (HTA) at 130, 160, 190, and $220^{\circ}C$. The fine structure and physical properties of the PEN fibers were investigated with various techniques such as wide-angle X-ray diffraction, DSC thermo-grams, density, birefringence, tensile test etc. As the annealing temperatures is increased, a partial transition of the crystal structure, from $\beta$ form crystal to $\alpha$ form crystal appeared in the WAXD test in case of CLA treatment. But, in case of HTA treatment, the transition of the crystal form from $\beta$ form crystal to $\alpha$ form crystal appeared dominantly. As the annealing temperature and tension increases, the melting peaks become sharper in DSC thermograms. Density of PEN fibers from HTA treatment is lower than that from CLA treatment, but birefringence and initial modulus of the PEN fibers from HTA treatment are much higher than those from CLA treatment. But, shrinkage of the PEN fibers from HTA treatment is higher than that from CLA treatment.