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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.
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복합섬유의 고속방사에 있어서 섬유구조형성(Ⅱ) : LLDPE/PET 복합의 효과 Effects of LLDPE/PET Bicomponent System
김경효,조현혹,장정대 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-
sheath-core형 복합섬유를 고속용융방사하여 방사속도에 따른 섬유구조의 변화를 검토하였다. 복합섬유는 폴리에틸렌테레프탈레이트(PET) 및 2종류의 선상 저밀도폴리에틸렌(LLDPE), 즉 융체유동속도(MFR)가 45, 50인 것을 사용하여 LLDPE를 sheath에 PET를 core에 배치하였다 고속방사된 복합섬유중의 각 성분의 구조형성을 복굴절, 광각X선회절 및 열분석 등으로 검토한 결과, PET성분을 단독으로 고속방사한 경우에 비해 LLDPE의 MFR에 상관없이 LLDPE/PET 복합섬유중의 PET성분은 약 1km/min 낮은 방사속도에서 배향결정화가 일어나 PET성분의 섬유구조형성은 촉진되었으며, LLDPE성분의 섬유구조형성은 LLDPE 단독으로 방사한 경우에 비해 억제됨을 확인하였다. 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), linear low-density polyethylene(MFR=45) (LLDPE(45)) and linear low-density polyethylene(MFR=50) (LLDPE(50)), were selected and two sets sheath/core combinations, LLDPE(45)/PET and LLDPE(50)/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 LLDPE/PET bicomponent fibers occurred at lower take-up velocities regardless of the type of LLDPE as compared to those in the single component spinning. The fiber structure formation of LLDPE component in LLDPE/PET bicomponent fibers was suppressed as compared to that in the single component spinning.
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