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.

Poly(trimethylene terephthalate) 섬유의 고속방사에 따른 미세구조 형성과 물성

조현혹,주시환,鞠谷 雄士 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.9

PTT polymer was spun by high-speed melt spinning method, and the effects of take-up velocity and mass flow rate on the fiber structure and properties were investigated. The changes in the structure and property with take-up velocities were studied by measuring WAXD, DSC, density, birefringence, dynamic viscoelasticity and tensile test, etc. The orientation in crystalline phase obtained by WASD increased with the increase of take-up velocity. The orientation-induced crystallization of PTT fibers in high-speed melt spinning appeared at the take-up velocity of about 3~4km/min. This tendency was confirmed by the results of DSC thermograms, density, and birefringence. The birefringence increased abruptly up to take-up velocity of 4km/min, but it became almost constant when the take-up velocity exceeded 4km/min. The tendency was confirmed by the result of dynamic viscoelasticity. The maximum point of $\alpha$$_{c}$-dispersion shifted to a higher temperature, but shifted to a lower temperature when the take-up velocity exceeded 4 km/min. The fine structure and the mechanical properties were not affected significantly by mass flow rate.e.

논문편 - 의생활 분야 : 시판 양말의 물성에 관한 소비과학적 검토

조현혹,정복남 ( Hyun Hok Cho,Bock Nam Chung ) 대한가정학회 1981 Human Ecology Research(HER) Vol.19 No.2

加工사織物의 壓縮特性에 關한 硏究

趙顯或 慶北工業專門大學 1977 論文集 Vol.14 No.-

Cloth thickness measurements are involved directly in a whole range of technological investigations: in any problem involving milling or raising; heat transmission and insulation; tactile judgement; in designing fabrics to meet specific requirements; or in studies of cloth geometry. If the principle interest is in softness of handle, then the information required is the entire relation between pressure and thickness-the compressibility of the fabric. It is supposed that there is a close relation between the compressional characteristics of fabrics and sensory characteristics which can be detected by hand metric method. These relations were examined by means of correlation matrix. The results obtained are as follows: 1. Compressional hardness and sturdiness show plus correlation, compressibility and compressional hardness show minus correlation in compressional characteristics. 2. Smoothness and hardness show plus correlation between sensory characteristics between compressional characteristics. 3. Fullness and cover factor show plus correlation between sensory characteristics and covering of cloth geometry.

Polyester加工系 織物의 휨 特性에 關한 硏究

趙顯或 慶北工業專門大學 1978 論文集 Vol.15 No.-

The flexural rigidities of the many kinds of fabrics are measured by heart loop method, clark's method, and slide method. Also bending properties were measured with the KES-F2 tester. The bending mechanism of fabrics could be explained as the bending rigidity, bending recovery, residual moment, and work recovery. In this paper, by analyzing the experimental results of each flexural rigidity test and bending test of 14 polyester textured fabrics, it can be concluded as follow: 1. The bending rigidity of a fabric increases both with thickness and fabric weight. 2. The stiffness of textile fabrics depend upon its bending characteristics, and in general the stiffness in direction is anisotropy. 3. The flexural rigidities of fabrics by clark method and slide method increase with the bending rigidity of fabrics, but by heat loop method is vice versa. 4. Cover factor and bending rigidity show plus correlation between fabric bending characteristics.

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(I) - 고밀도 폴리에틸렌의 MFR의 영향 -

조현혹,김경효 한국섬유공학회 1998 한국섬유공학회지 Vol.35 No.4

Fibers of high density polyethylene having melt flow rate of 11 and 28 (g/10 min) were produced by high-speed melt spinning method in the range of take-up velocity from 1 to 8 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 with sigmoidal shape according to increasing take-up velocity, and that of HDPE(11) was higher than HDPE(28). With increasing take-up velocity, the crystal orientation of HDPE transformed a-axis orientation into c-axis orientation. In dynamic viscoelastic behavior of HDPE fibers by the high speed spinning, the intensity of crystalline relaxation peak was decreased and crystalline relaxation temperature shifted to lower. Tensile strength and initial modulus were increased and elongation was decreased with increasing take-up velocity. HDPE(11) fibers was preferred to HDPE(28) in mechanical properties because of increment of crystal and amorphous orientation factors. The change of birefringence with take-up veloicity was closely related to both initial modulus and tenacity uniformly.

복합섬유의 고속방사에 있어서 섬유구조형성(I)-HDPE/PET 복합의 효과-

조현혹,국곡웅사 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.4

High-speed melt spinning of sheath-core type bicomponent fibers was performed and the change of fiber structure with increasing take-up velocity was investigated. Three kinds of polymers, poly(ethylene terephthalate)(PET), high-density polyethylene(MFR=11)(HDPE11) and high-density polyethylene(MFR=28)(HDPE28), were selected and two sets sheath/core combinations, HDPE(11)/PET and HDPE(28)/PET(i.e. sheath/core), were studied. The structure of each component in high-speed spun bicomponent fibers was analyzed through the birefringence, wide-angle X-ray diffraction measurements and DSC thermogram measurements. The development of molecular orientation and the initiating of the orientation-induced crystallization of PET in HDPE/PET bicomponent fibers occurred at lower take-up velocities regardless of the type of HDPE as compared to those in the single component spinning. The fiber structure formation of HDPE component in HDPE/PET bicomponent fibers was suppressed as compared to that in the single component spinning. The molecular orientation of HDPE in HDPE/PET bicomponent fibers was increased initially and then decreased with take-up velocities.

고탄성률 및 저수축률을 갖는 타이어코드용 섬유

조현혹,방윤혁,이기환 한국고분자학회 2000 고분자 과학과 기술 Vol.11 No.5

초고분자량 PAN 섬유의 고강력.고탄성화를 위한 구조 해석

조현혹,박지은,김홍성,Jo, Hyeon-Hok,Park, Ji-Eun,Kim, Hong-Seong 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.1

The critical concentrations for high tensile strength and modulus polyacrylonitrile(PAN) were measured on dimerhylformamide solution of PAN's which had various kinds of average molecular weights. These critical concentrations decreased with increasing molecular weight and were nearby placed at the same viscosity regardless of molecular weight. The PAN films were cast from the solution of critical concentrations. Two kinds of uniaxially drawn films were prepared; one was drawn in boiling water and the other was drawn in dry heat again artier drawn by 3 limes in boiling water. The structures of the drawn films were investigated by X-ray dinractometer, thermomechanical analysis, dynamic mechanical analysis, and tensile measurements. From this study, it has been found that the larger the molecular weigh of PAN increases, the higher the draw ratio is required to cause the crystallization upon drawing together with the increase in fibrillization of film surface. The degree of the overall crystallization and the molecular stress and internal defects in amorphous region increased with increasing molecular weight of PAN.