• 제목/요약/키워드: I-fiber

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용존산소 제거용 polyolefin계 중공사 분리막의 제조(I) - 방사조건이 중공사분리막의 pore형성에 미치는 영향 - (Preparation of polylefin hollow fiber membrane for removal of dissolved oxygen(I) - Effect of spinning condition of formation of micropores -)

  • 김승일;선향;이의소
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2000년도 봄 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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    • pp.41-44
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    • 2000
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셀룰로오스 트리아세테이트 액정용액으로 부터 고강도 셀룰로오스 섬유 제조에 관한 연구 (High Tenacity Cellulosic Fiber from Liquid Crystal Solution of Cellulose Triacetate)

  • 홍영근
    • 한국염색가공학회지
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    • 제6권1호
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    • pp.44-48
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    • 1994
  • Cellulose triacetate(CTA) liquid crystal solutions obtained via dissolution of CTA in solvent mixture of triflucroacetic acid and methylene chloride were spun and saponified in various chemicals. Among chemicals, methanol/sodium hydroxide mixture endowed highest tenacity as well as modulus to regenerated cellulosic fiber and the fiber thereof showed Cell I or Cell IV morphology, or mixed morphology of Cell I and IV.

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PET-PCT 공중합체의 합성과 물성 I - 열적성질과 분해거동 - (Synthesis and Properties of PET-PCT Copolyester I - Thermal Property and Degradation Behavior -)

  • 이원옥;김해영;백두현
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2001년도 가을 학술발표회 논문집
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    • pp.351-354
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    • 2001
  • Poly(ethylene terephthalate) (PET)는 물리적, 기계적 성질이 우수한 엔지니어링 플라스틱의 하나로 섬유, 필름, 및 여러 가지 용도로 다양하게 사용되고 있다. PET는 DMT(dimethyl terephthalate) 또는 TPA(terephthalic acid)와 EG(ethylene glycol)를 축합 중합하여 제조한다. (중략)

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횡하중을 받는 SiC/Ti-15-3 MMC 복합재 계면영역에서의 탄소성 응력장분포거동(I) (Elastic-Plastic Stress Distributions Behavior in the Interface of SiC/Ti-15-3 MMC under Transverse Loading(I))

  • 강지웅;김상태;권오헌
    • 한국안전학회지
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    • 제19권4호
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    • pp.25-30
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    • 2004
  • Unidirectional fiber-metal matrix composites have superior mechanical properties along the longitudinal direction. However, the applicability of continuous fiber reinforced MMCs is somewhat limited due to their relatively poor transverse properties. Therefore, the transverse properties of MMCs are significantly influenced by the properties of the fiber/matrix interface. In this study, the interfacial stress states of transversely loaded unidirectional fiber reinforced metal matrix composites investigated by using elastic-plastic finite element analysis. Different fiber volume fractions $(5-60\%)$ were studied numerically. The interface was treated as thin layer (with different properties) with a finite thickness between the fiber and the matrix. The fiber is modeled as transversely isotropic linear-elastic, and the matrix as isotropic elastic-plastic material. The analyses were based on a two-dimensional generalized plane strain model of a cross-section of an unidirectional composite by the ANSYS finite element analysis code.

하이브리드섬유보강 프리캐스트 콘크리트의 보강섬유 종류에 따른 역학적 특성 및 충격저항성 (Mechanical Properties and Impact Resistance of Hybrid Fiber Reinforced Concrete with Type of Reinforcing Fibers for Precast Concrete)

  • 오리온;박찬기
    • 한국농공학회논문집
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    • 제55권4호
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    • pp.29-35
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    • 2013
  • The objective of the current study is to evaluate the effects depending on the types of reinforcing fibers being influential in view of mechanical properties and impact resistance of hybrid fiber reinforced concrete (HFRC) for applications to precast concrete structure. Hybrid fibers applied therefor were three types such as PP/MSF (polypropylene fiber+macro synthetic fiber), PVA/MAF (polyvinyl alcohol fiber+MSF) and JUTE/MSF (natural jute fiber+MSF), where the volume fraction of PP, PVA and natural jute was applied with 0.2 %, respectively, while based on 0.05 % volume fraction of MSF. The HFRC was tested for slump, compressive strength, flexural strength and impact resistance. The test result demonstrated that mixture of such hybrid fibers improve compressive strength, flexural strength and impact resistance of concrete. Moreover, it was found that HFRCs to which hydrophilic fibers, i.e. PVA/MSF and JUTE/MSF, were mixed show more improved features that HFRC to which non-hydrophilic fiber, i.e. PP/MSF was mixed. Meanwhile, the finding that PVA/MSF HFRC exhibited better performance than JUTE/MSF HFRC was attributed from the former having higher aspect ratio than that of the latter.