• 제목/요약/키워드: Dry-jet wet spinning

검색결과 13건 처리시간 0.025초

이타콘산을 함유한 폴리아크릴로니트릴 공중합체의 섬유제조 및 그 물성에 관한 연구 (A Study on Fiber Formation and Physical Properties of Polyacrylonitrile Copolymer with Itaconic acid)

  • 신익기;이신희;박수민
    • 한국염색가공학회지
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    • 제14권2호
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    • pp.109-109
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    • 2002
  • A study has been made of the dry-jet-wet spinning of PAN copolymer fibers using 60% aqueous zinc chloride solution as solvent and 25∼40% aqueous zinc chloride solution as non-solvent. The technological characteristics of this method were that small streams of dope were extruded from the die and allowed to pass through a short distance of air gap(about 10mm) before entering the spinning bath for full coagulation. This work showed the importances which coagulation condition, stretch ratio and fiber tenacity up to 10.5 g/d could be obtained with elongation of 11∼16%. Individual fibers were evaluated on the basis of density and mechanical properties such as tenacity and elongation etc.

이타콘산을 함유한 폴리아크릴로니트릴 공중합체의 섬유제조 및 그 물성에 관한 연구 (A Study on Fiber Formation and Physical Properties of Polyacrylonitrile Copolymer with Itaconic acid)

  • 박수민;신익기;이신희
    • 한국염색가공학회지
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    • 제14권2호
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    • pp.33-39
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    • 2002
  • A study has been made of the dry-jet-wet spinning of PAN copolymer fibers using 60% aqueous zinc chloride solution as solvent and 25∼40% aqueous zinc chloride solution as non-solvent. The technological characteristics of this method were that small streams of dope were extruded from the die and allowed to pass through a short distance of air gap(about 10mm) before entering the spinning bath for full coagulation. This work showed the importances which coagulation condition, stretch ratio and fiber tenacity up to 10.5 g/d could be obtained with elongation of 11∼16%. Individual fibers were evaluated on the basis of density and mechanical properties such as tenacity and elongation etc.

연료전지 버스용 (200kW급) 막가습기 개발 (Development of Membrane Humidifier for Fuel Cell Bus (200kW))

  • 이무석;강충석;윤영서;김경주;윤준기
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 추계학술대회
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    • pp.471-473
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    • 2006
  • An object of the present study is to provide a hollow fiber membrane humidifier capable of improving the humidification efficiency while lowering the pressure loss, and is suitably usable for PEMFC(Polymer Electrolyte Membrane Fuel Cell). The performance of PEMFC is decisively dependent on the humidity of the electrolyte membrane(fluorinated membrane) and a humidifier plays an important role in moisturizing electrolyte membrane. Especially this humidifier is adaptable for lower price to promote the commercialization of fuel cell vehicles and is passive type to be power free and to be volumetrically optimized. In this research, we propose the substitutes for the expensive fluorinated materials and the optimum dry-jet wet spinning conditions of hollow fiber membrane to get the fuel cell humidifier. In addition to that we established the standard method of evaluating the moisturizing performance of the humidifier of various materials.

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연료전지 자동차용 막 가습기 개발 (Development of Membrane Humidifier for FCEV)

  • 김경주;이무석;윤준기;신용철
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2007년도 추계학술대회 논문집
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    • pp.177-179
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    • 2007
  • An object of the present study is to provide a hollow fiber membrane humidifier capable of improving the humidification efficiency while lowering the pressure loss, and is suitably usable for PEMFC(Polymer Electrolyte Membrane Fuel Cell). The performance of PEMFC is decisively dependent on the humidity of the electrolyte membrane(fluorinated membrane) and a humidifier plays an important role in moisturizing electrolyte membrane. Especially, this humidifier is a passive type(power-free) item and is volumetrically optimized. In this research, we propose the substitutes for the expensive fluorinated humidifier materials and the optimum dry-jet wet spinning conditions of hollow fiber membrane. In addition to that, This study will present an performance of an humidifier and compare computational results with the experimental data.

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Dry-jet Wet Spinning of Polyhydroxyamide Fibers

  • Park, Seung-Koo;Cho, Seo-Hyun;Farris, Richard-John
    • Fibers and Polymers
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    • 제1권2호
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    • pp.92-96
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    • 2000
  • A high molecular weight polyhydroxyamide (PHA) solution in N, N-dimethyl acetamide (DMAc) was prepared from 3, 3'-dihydroxybenzidine and isophthalic chloride (IPC), which was used for spinning PHA fiber. Before spinning, the diffusion property of DMAc into various coagulants was examined. The fiber was well formed in coagulants such as water/ethanol with a composition of 5/5, ethanol, and ethanol/isopropanol with a composition of 7/3 and 5/5. However, the PHA fiber spun in the water/ethanol mixture contained voids. After the fiber spun in ethanol was annealed at over $350^{\circ}C$, the ultimate stress and initial modulus of the fiber increased from 75.5 MPa and 3.22 GPa to 369 MPa and 29.5 GPa, respectively. These properties of the PHA fiber spun by the dry spinning method were also enhanced, attaining 154 MPa and 5.56 Gpa, respectivel.

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Rheological Analysis in a Spinning Process of a hollow fiber membrane

  • Jang, Moon-Seog
    • 한국막학회:학술대회논문집
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    • 한국막학회 1995년도 추계 총회 및 학술발표회
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    • pp.5-9
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    • 1995
  • In the dry-jet-wet-spinning process of a hollow fiber membrane, the polymer solution is pumped into a coaxial tube, jet spinneret. The threadline emerging from the spinneret is stabilized by an internal coagulating medium(liquid or gas) as it emerges from the jet orifice. The nascent hollow thread is further stabilized in a quench bath as shown in Fig. 1. In this scheme, three mechanism of formatiota(temperature gradient, solvent evaporation, and solvent-nonsotvent exchange) can be combined. The changes which promote stabilization often play a dominant role in determining the ultimate fiber wall structure as well. Hence, in pratice, hollow fiber stabilization and development of membrane structure are commonly inseparable. However, fiber dimension(the inside diameter and wall thickness of the hollow fiber) is mainly a rheological problem and is determined by dope pumping rate, spinneret diatance from the coagulation bath, inner coagulant flow rate, and fiber draw-rate. Besides rheological phenomena play a prominent part in the final properties of the hollow fiber.

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Preparations of Chemical Cellulose from Ascidian Tunic and Effect of Spinning Conditions on the Properties of New Regenerated Cellulose Fiber

  • Koo, Won-Mi;You, Sang-Hoon;Lee, Dong-Jin;Kim, Eun-Young;Kim, Han-Do
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 2000년도 봄 한국섬유공학회 학술발표회 논문집(Proceedings of the Korean Textile Conference)
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    • pp.125-128
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    • 2000
  • Chemical cellulose from an ascidian tunic is isolated by extraction, digestion and bleaching steps. The content of $\alpha$-cellulose was above 98 wt%, and it's DPw was about 918. A new regenerated cellulose fiber from the chemical cellulose obtained in this study was made using NMMO/water(87/13 wt%) as a solvent by dry jet-wet spinning. The effects of spinning speed and cellulose content of spinning dope on the properties were investigated.

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Cellulose-EVOH 섬유의 제조와 물성에 관한 연구 (A Study on the Preparation and Properties of Cellulose-EVOH Fibers)

  • 문병화;임상규;손태원;김삼수
    • 한국염색가공학회지
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    • 제10권5호
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    • pp.19-23
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    • 1998
  • In this study, Cellulose-Poly(Ethylene-Co-Vinyl Alcohol) (EVOH) fibers from MMNO(N-me-thylmorpholine-N-oxide) /water/cellulose/EVOH were prepared according to changes of EVOH content(wt%), which is main factors to dry-jet wet spinning. The mechanical properties and morphology of produced fibers were investigated. The resultant fibers had tensile strength of 3.7∼4.5g/d, elongation of 3.3∼7.5% and exhibited lower density than the density of pure cellulose fiber.

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