• Title/Summary/Keyword: Acrylic Fiber

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A Study of Fine Fiber Formation and Physical Properties of Polyacrylonitrile Copolymer (폴리아크릴로니트릴 공중합체의 극세 섬유제조 및 그 물성)

  • Lee, Shin-Hee
    • The Korean Fashion and Textile Research Journal
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    • v.14 no.3
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    • pp.472-477
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    • 2012
  • The conditions of wet spinning were considered in order to prepare the fine denier of acrylic fiber. Polyacrylonitrile copolymer was synthesized by the copolymerization of acrylonitrile (AN) and methyl acrylate (MA) initiated by an aqueous sulfite-chlorate redox system. Acrylic fiber was manufactured through wet-spinning in a dimethyl formamide (DMF) system. The conditions of wet-spinning were investigated by i-value, spinning speed, diameter of spinneret, draw ratio, water content of spinning dope and morphology of protofiber. The physical properties of fibers were investigated by Instron. In this experiment, the minimum i-value decreased with the decreasing spinneret diameter, an increased spinning speed, and an increased coagulation bath (CBC) concentration. The maximum draw ratio increased with an increased CBC. The optimum CBC and water content of the spinning dope were 60%-65% and 3.5%, respectively. The tenacity at the breaking point increased with a decreased fineness of fiber. The elongation at breaking point was almost the same value as a function of the fineness of fiber.

Effect of Processing Variables on the Acrylic Fiber Fineness during Electrospinning (전기방사시 공정조건이 아크릴 섬유의 선밀도에 미치는 영향)

  • 심현주;이승훈
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.04a
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    • pp.390-391
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    • 2003
  • 극세사를 제조하는 방식은 복합방사 방식 외에 고온, 고속의 공기를 이용하여 연신된 초세화 섬유를 fiber web으로 제조하는 melt-blown방식과 전기방사(electrospinning)등이 있다. 전기방사에 의한 방식은 용액방사와 용융방사에 의한 방식이 가능하여 적용 고분자의 종류가 보다 다양할 뿐 아니라 공정자체가 semi-static하여 연속 필라멘트의 제조가 가능하며 전기장에 의하여 섬유가 분리됨으로, 사용 고분자에 따라 영구대전이 가능할 뿐 더러 melt-blown 방식에 의한 fiber web보다 개섬성이 우수하며, 수집된 fiber web의 random화가 용이하고, 방사 후 섬유간의 협착을 방지 할 수 있는 등 많은 장점을 갖고 있다. (중략)

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A Study on the Resistance for Frost Damage of Polypropylene Fiber Reinforced Light Weight Polymer Cement Concrete (폴리프로필렌섬유보강 경량 폴리머 시멘트 콘크리트의 내동해성에 관한 연구)

  • 소형석;소승영;소양섭;박종호;탁재호
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.10a
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    • pp.89-92
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    • 1995
  • For the development of lilght weight cement concrete with high durability, this study used perlite and paper sludge ash by the light weight material, and polypropylene fiber by the reinforcment, and poly-acrylic ester emulsion by the matrix improvement. According to the increasing mixture ratio of fiber and use of polymer, the light weight polypropylene fiber reinforced polymer cement ratio of fiber and use of polymer, the light weight polypropylene fiber reinforced polymer cement concrete were showed high resistance for frost damage.

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Synthesis and Characterization of Acrylic Polymer Containing Silk Protein

  • Zhongmin Chen;Kim, Mutsumi ura;Masahiro Suzuki;Yoshiyuki Kondo;Kenji Hanabusa;Hirofusa Shirai
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10a
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    • pp.87-87
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    • 2003
  • Three kinds of acrylic polymers containing silk protein were synthesized, which are (1) blending of silk fibroin (SF) fiber and polyacrylonitrile (PAN); (2) graft-copolymer of PAN onto SFs; (3) random-copolymer synthesized by copolymerization of acrylonitrile (AN) and silk fibroin peptide (SFP) with vinyl groups, and their solubility, thermal property, and moisture absorption was investigated, respectively. These polymers have difference solubility and attributable to their structure. Their excellent thermal stabilities and better moisture absorptions were indicated.

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Adsorption Properties of Uranium on Acrylic Fibers Treated with Hydroxylamine (하이드록실 아민으로 처리한 아크릴 섬유의 우라늄 흡착특성)

  • Chin Young Gil;Lee Jung Sook
    • Journal of the Korean Society of Clothing and Textiles
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    • v.14 no.2
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    • pp.98-103
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    • 1990
  • Fibrous adsorbents containing amidoxime group which make chelate complexes with uranyl ions are studied for the recovery of uranium from sea water. Acrylic fibers are used as base Polymer. The adsorption properties of uranium are carried out to examine pH effect, concen-tration dependence, adsorption rate, separation, and chelate complex. The results obtained are as follows; 1. Metal capacity of U (VI) ion is in the range of pH $2\~10.2$. Amidoxime group-containing fiber recover U (VI) ions existed in sea water or waste water in extremely small quantities. 3. Using amidoxime group-containing fiber Cu (II) and U (VI) are separated with each other in dilute nitric acid solution (pH 2.3). 4. U (VI) chelate complexes are conformed by tridendate ligands, which are coordinated with one nitrogen and two oxygens onto amidoxime group-containing fiber.

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Radiation Grafting of Hydrophilic Monomers onto Polyester

  • Park, Jae-Ho;Lee, Chong-Kwang;Lee, Kwang-Jin
    • Nuclear Engineering and Technology
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    • v.5 no.2
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    • pp.103-114
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    • 1973
  • Radiation grafting of acrylic acid and 4-vinylpyridine at room temperature has been studied by an impregnation method to improve the hygroscopic properties, the antistatic behavior and the dyeability of polyester fabric. Polyester fabric was impregnated with acrylic acid or aqueous emulsion of acrylic acid-4-vinylpyridine by immersion at 25$^{\circ}$or 7$0^{\circ}C$. The impregnated fabric was irradiated under nitrogen gas with ${\gamma}$-rays from Co-60. When acrylic acid grafted polyester fabric was treated with sodium carbonate, calcium acetate and potassium persulfate, tne rate of water absorption was increased and most parts of polyacrylic acid formed were extracted off from the fabric with 0.1% solution of sodium hydroxide at 10$0^{\circ}C$. In the case of the impregnation of a mixture of acrylic acid and 4-vinylpyridine the petcent of grafting has been shown to be proportional to the ratio of 4-VP/AA and radiation dost. Estimating by contact angle measurements of water on the various polymer surfaces, the antistatic behavior was decreased with the increase of grafting percent. The investigation of electron micrograph disclosed the existence of certain type of discontinuities in the acrylic acid grafted polyester fiber which was treated with various salts.

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EFFECTS Of VARIOUS SILANE COUPLING AGENTS ON THE STRENGTH AND THE SURFACE ROUGHNESS OF GLASS FIBER-ADDED PMMA RESIN (수종의 실란처리 유리섬유를 첨가한 의치상용 레진의 강도변화 및 마모전.후 표면성상분석)

  • Lee, Sang-Il;Kim, Chang-Whe;Lim, Young-Jun;Kim, Myung-Joo;Yun, Suk-Dae
    • The Journal of Korean Academy of Prosthodontics
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    • v.45 no.4
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    • pp.457-468
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    • 2007
  • Statements of problem: The fracture of acrylic resin dentures remains an unsolved problem. Therefore, many investigations have been performed and various approaches to strengthening acrylic resin, for example, the reinforcement of heat-cured acrylic resin using glass fibers, have been suggested over the years. Silane is important for bonding between glass fiber and resin. Purpose: The aim of the present study was to investigate the effect of various silane on the strength of PMMA resin and roughness of resin-glass fiber complex after abrasion test. Material and methods: 3mm glass fiber (Chopped strand, Hankuk fiber Co., Milyang, Korea) was treated with 3 kinds of silane (MPS, EPS, APS) (Sila-ace, Chisso chemical, Tokyo, Japan) and mixed with PMMA resin(Vertex RS, Vertex Dental B.V., Zeist, Netherlands). Transverse strength and Young's modulus was measured using Instron (Instron model 4466, Instron, Massachusetts, USA). After abrasion test (The 858 Mini Bionix II Test System, MTS System Co., Minnesota, USA) surface roughness was evaluated using tester (Form Talysurf plus, Taylor Hopson Ltd., Leicester England). Examination of scanning electron microscope was also performed. Results: Within this study, the following conclusions were drawn. 1. Surface treatment of glass fiber with MPS and APS increased transverse strength of PMMA resin complex, but surface treatment with EPS decreased transverse strength of PMMA resin complex (p<0.05). 2. Silane treated glass fiber increased Young's modulus of PMMA resin complex compared to desized glass fiber (p<0.05). 3. Roughness increased after abrasion test in case of PMMA resin reinforced with desized glass fiber (p<0.05). 4. Roughness change was not observed after abrasion test in case of PMMA resin reinforced with silane treated glass fiber (p>0.05).

Pervaporation Separation Characteristics for Water-Ethanol Mixtures Using Porous Hollow Fiber PVA Composite Membranes (미세 다공성 중공사 PVA복합막을 이용한 에탄올 수용액의 투과증발분리 특성)

  • Kim, Ji Seon;Park, Hun Whee;Seo, Chang Hee;Rhim, Ji Won
    • Membrane Journal
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    • v.23 no.5
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    • pp.360-366
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    • 2013
  • The Poly (vinylidene fluoride) and poly (acrylonitrile) (PAN) hollow fiber composite membranes coated with poly (vinyl alcohol) (PVA) and poly (acrylic acid) (PAA) as the crosslinkig agent are prepared. The resulting membranes were characterized for aqueous 90 wt% ethanol solution by pervaporation techniques in terms of the permeability and separation factor. In general, as both the crsslinking reaction temperature and the crosslinking agent concentration increase, the permeability decrease while the separation factor tends to increase. And also the permeability increased and the separation factor decreased as the feed temperature increased. Typically, the permeability $502g/m^2hr$ at the feed temperature $70^{\circ}C$ was obtained for PVDF hollow fiber membrane prepared with the crosslinking agent PAA 3 wt% at the reaction temperature $60^{\circ}C$ whereas the separation factor 218 was shown for the membrane reacted with PAA 11 wt% and at $100^{\circ}C$ for the feed temperature $50^{\circ}C$.