• 한국염색가공학회지
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• 제27권4호
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• pp.334-339
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• 2015

Polyketone fiber, a newly developed high strength fiber, has a tenacity and modulus similar to the paramid fiber, and can be used for reinforcing mechanical rubber goods(MRG), such as tires, hoses, and technical textiles. In addition, aliphatic polyketone, which has excellent strength, modulus, chemical stability and reasonable price, is being developed only in South Korea. It will be expected for replacement of super fiber such as aramids and increasing the technical textile market share. This paper surveys the mechanical properties of polyketone fiber yarn for technical textiles. For this purpose, two kinds of yarns are prepared, mechanical properties of coated and uncoated polyketone yarns such as tensile strength, elongation and modulus were examined before and after weather resistance test(temperature $60^{\circ}C$, humidity 60%, amount of power $0.67w/m^2$). The differences of mechanical properties between uncoated and coated yarns for high functional technical textiles and composite materials are estimated through this study.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 토목섬유 학술발표회 논문집
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• pp.21-38
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• 1999

Engineering properties of most polymers used in geosynthetics such as geogrid can be degraded by the chemical reaction (e.g., oxidization, ultraviolet rays, hydrolysis etc.), chemical and mechanical load, microorganism, and so on. In addition, polymer can be damaged by the compaction during construction, and the characteristic of tensile strength of polymer can be changed by the long-term creep effect. In this study, engineering properties of flexible geogrids which are manufactured by weaving/knitting the high-tenacity polymers such as polyester formed in a very open, grid-like configuration, coated with any one of a number of materials (e.g., PVC, latex, etc.), are investigated. Through the analysis of test results, the durability and the long-term design tensile strength of flexible geogrids are evaluated.

• 한국염색가공학회지
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• 제13권6호
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• pp.405-412
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• 2001

In order to impart dyeability on to Polypropylene fiber, PP/EVA blend in the form of fibers and film were preparared using melt blending process. Ethylene vinylacetate containing 28wt% of vinylacetate(EVA(28)) was used as a copolymer. In the study of mechanical properties, tenacity and initial modulus decreased with Increasing EVA concentrations, whilst extension at break increased with increasing EVA contents. Their results in the dyeing behavior show that dye adsorption increased with increased EVA contents iota both blend fibers and films. The extent of dye uptake of red dye to modified polypropylene fibers was greater than that of Blue and Yellow counterparts due to the difference behavior of dye particles in dyeing bath.

• 한국염색가공학회지
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• 제13권6호
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• pp.47-47
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• 2001

In order to impart dyeablility on to Polypropylene fiber, PP/EVA blend in the form of fibers and film were preparared using melt blending process. Ethylene vinylacetate containing 28wt% of vinylacetate(EVA(28)) was used as a copolymer. In the study of mechanical properties, tenacity and initial modulus decreased with increasing EVA concentrations, whilst extension at break increased with increasing EVA contents. Their results in the dyeing behavior show that dye adsorption increased with increased EVA contents for both blend fibers and films. The extent of dye uptake of red dye to modified polypropylene fibers was greater than that of Blue and Yellow counterparts due to the difference behavior of dye particles in dyeing bath.

• Fibers and Polymers
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• 제5권1호
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• pp.59-67
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• 2004

The development of high tenacity, high modulus monofilaments from Polypropylene/Clay nanocomposite has been investigated. Pure sodium montmorillonite nanoclay was modified using hexadecyl trimethyl ammonium bromide (HTAB) via an ion exchange reaction. Pure and modified clay were characterized through X-ray diffraction, FTIR and TGA. The modified clay was melt blended with polypropylene (PP) in presence of a swelling agent. Composite filaments from PP/Clay nanocomposite were prepared at different weight percentages of nanoclay and the spinning and drawing conditions were optimized. The filaments were characterized for their mechanical, morphological and thermal properties. The composite PP filaments with modified clay showed improved tensile strength, modulus and reduced elongation at break. The composite filaments with unmodified clay did not show any improvement in tensile strength but the modulus improved. The sharp and narrow X-ray diffraction peaks of PP/nanoclay composite filaments indicate increase in crystallinity in presence of modified clay at small loadings (0.5 %). The improved thermal stability was observed in filaments with modified as well as unmodified clays.

• 감성과학
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• 제13권4호
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• pp.687-692
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• 2010

본 연구에서는 원적외선 방출 직불 소재를 개발하기 위해서 나노사이즈 게르마늄 업자와 PET chip을 마스터 배치 칩으로 제조하고 이를 PET와 용융 방사하여 sheath-core conjugate 복합사를 제조하여 이들의 물성과 이들 복합사로 제조한 직물의 원적외선 방출특성을 측정 분석하였다. 또한 게르마늄을 함유한 필라멘트와 직물의 물성을 측정하고 이들 물성이 사가공 공정의 중요공정 인자인 벨트각과 사속비 등의 공정인자와 직물 설계에서의 경사와 위사의 밀도에 관계하는 직물 밀도 계수 등의 설계 조건에 의해 직물 역학 특성과 직물 촉감등의 물성이 어떠한 변화를 가져 오는가에 대한 분석을 하였다. 최적 방사조건에 의한 core부에 게르마늄이 함유된 sheath-core형 PET복합사를 제조하였으며 이들의 절단강신도 모두 일반 PET계(系)의 물성치를 보였으며 DTY는 제직성에 문제가 없는 강신도를 보였고 습건열 수축률은 일반 PET사 보다 높은 값을 보였다. 게르마늄 함유 직물의 원적외선 방사강도는 $5{\sim}20{\mu}m$ 파장 영역에서 $3.53{\times}10^2W/m^2$을 보였으며 방사율은 0.874를 보였다. 그리고 최적 사가공 공정 조건 설정과 최적 직물밀도 설계로 직물의 역학 특성치와 촉감 특성의 저하를 막을 수 있음을 확인할 수 있었다.

• 보존과학회지
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• 제30권2호
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• pp.219-234
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• 2014

박물관에서 소장품의 저산소 농도 살충처리를 위해, 직물, 염색 직물, 종이, 염색지 및 채색편의 색상 및 기계적 성질에 미치는 영향을 평가하였다. 저산소 농도 살충 조건은 질소 및 아르곤을 사용하여 조성한 산소 농도 0.01%, 온도($20^{\circ}C$, $25^{\circ}C$, $30^{\circ}C$), 습도 50%, 살충 시간 30일이였다. 직물은 생견 직물, 자외선 열화 생견 직물, 정련 견직물, 자외선 열화 정련 견직물, 광목 및 자외선 열화 광목을 평가 대상으로 하였다. 천연염색 견직물과 면직물은 생쪽, 쪽, 홍화, 자초, 꼭두서니, 소목, 황벽, 울금, 치자, 황련, 괴화, 코치닐, 자광, 오리나무, 오배자, 밤피 및 쪽과 홍화 복염, 쪽과 황벽 복염, 쪽과 괴화 복염, 쪽과 소목 복염 등 천연염색 직물 각 20종이었다. 평가 대상 종이는 한지(닥지, 닥과 볏짚 혼합지), 화지(안피지), 면지, 린넨지, 면, 아마 및 마닐라삼 혼합지, 복사지, 신문지, 반수 닥지 등 9종이었다. 염색지는 한지에 쪽, 소목, 꼭두서니, 홍화, 치자, 황벽, 괴화로 천연염색한 것을 평가하였다. 채색편은 반수 한지와 반수 화견에 석청, 석록, 주사, 주, 석자황, 등황, 연단, 대자, 석간주, 니람, 연지(자광, 코치닐, 홍화, 꼭두서니), 뇌록, 스몰트, 울트라마린블루, 라피스라즈리, 프러시안블루, 백토, 연백, 호분(굴껍질 호분, 대합껍질 호분) 등 23종의 안료 분말을 아교물에 개어 도포한 것이었다. 평가 대상 재료에 대해 저산소 농도 살충처리 전후의 색차를 평가한 결과, 색차 ${\Delta}E^*$는 1.5 이하이거나 대조군보다 낮았으며, 직물 및 염색 직물의 살충처리 전후의 인장강도 변동률은 기준치 이하였다. 그리고 가스(질소와 아르곤)와 살충 온도에 따른 색차 및 인장강도 변동률에 대한 영향도 없었다.

• Macromolecular Research
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• 제15권1호
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• pp.65-73
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• 2007

Chitosan, fibroin, and hydroxyapatite are natural biopolymers and bioceramics that are biocompatible, biodegradable, and resorb able for biomedical applications. The highly porous, chitosan-based, bioceramic hybrid composite, chitosanlfibroin-hydroxyapatite composite, was prepared by a novel method using thermally induced phase separation. The composite had a porosity of more than 94% and exhibited two continuous and different morphologies: an irregularly isotropic pore structure on the surface and a regularly anisotropic multilayered structure in the interior. In addition, the composite was composed of an interconnected open pore structure with a pore size below a few hundred microns. The chemical composition, pore morphology, microstructure, fluid absorptivity, protein permeability, and mechanical strength were investigated according to the composition rate of bioceramics to biopolymers for use in tissue engineering. The incorporation of hydroxyapatite improved the fluid absorptivity, protein permeability, and tenacity of the composite while maintaining high porosity and a suitable microstructure.

• Elastomers and Composites
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• 제34권3호
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• pp.247-252
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• 1999

보강 및 차수재인 지반용 고무재료를 열융착법에 의해 제조하였으며 환경공학분야에 적용을 위해 성능을 평가하였다. 이들 재료를 제조하는데 스펀본드 폴리에스테르 부직포, 유리섬유매트, 고강력 폴리에스테르사를 이용한 직포형 지오그리드를 기재로, SBS 함유 탄성 bitumen과 아스팔트를 보강재로 각각 사용하였다. 유리섬유 매트와 지오그리드를 기재로 사용한 지반용 재료의 경우 역학적성질이 우수하였으며, 부직포와 탄성 bitumen을 기재로한 경우에는 투수성이 우수하였다. 고무와 아스팔트를 혼합한 경우 연화점은 거의 변화가 없었으며, 고온에서의 치수안정성은 $120^{\circ}C$의 경우 두드러진 수축이 발생하지 않았다. 지반용 고무재료의 자외선에 대한 저항성은 가시적인 변화가 나타나지 않았다.

• 한국염색가공학회지
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• 제26권4호
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• pp.331-338
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• 2014

In this research, split-type complex yarn of 20:80, 40:60, 50:50 nylon6/polyester composition ratio was used in order to impose unique sense on split-type complex woven. After treating both split-type complex yarn of each ratio and its produced woven in alkali solution, we got the following results by checking physical properties based on alkali proportion and treatment time. Under the condition of NaOH 20% in this experiment, it took approximately double time 20% loss of weight. The loss of weight became high when polyester proportion of N/P(nylon6/polyester) composition ratio was low, in the same fineness yarn. Even though polyester proportion was low, the loss of weight was low when the fineness was high. N/P division was well processed at about 25% loss of weight under the condition of NaOH 20%, treatment temperature $50^{\circ}C$, and treatment time 60 minutes. The research provides that the loss of weight should be processed around treatment time 24 hours in the case of NaOH concentration 15%, and treatment time 15 hours in the case of NaOH concentration 18%, respectively, in order to achieve N/P woven division ratio of about 70%-80% in industrial fields.