• Proceedings of the Korean Fiber Society Conference
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• 2003.10b
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• pp.231-232
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• 2003

산성염료는 양모나 나일론 등 폴리아미드 섬유에 염착을 하여 염색이 되는 염료이다. 산성염료의 염색 견뢰도를 증가시키기 위해서는 금속매염을 이용하는 경우와 함금속 산성염료를 사용하는 방법이 있다[1-21. 특히 나일론의 경우는 산성염료로 염색시 낮은 흡착률과 견뢰도측면에서 많은 문제점이 발생하고 있다. 이 연구에서는 크롬, 코발트 등의 금속을 함유하고 있는 다양한 구조의 함금속 산성염료를 합성하고 염색성과 견뢰도를 조사하였다. (중략)

• Journal of the Society of Disaster Information
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• v.7 no.4
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• pp.286-293
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• 2011

Accordingly architectural structure is getting high-rise and bigger, a use of high strength and high performance concrete has been increased. High performance concrete has cons of explosion in a fire. This explosion in the fire can cause the loss of the sheath on a concrete surface, therefore it effects that increasing a rate of heat transmission between the steel bar and inner concrete. Preventing this explosion of high performance concrete in the fire, many kinds of researches are now in progressing. Typically, researches with using polypropylene-fiber and steel-fiber can prove controling the explosion, but the reduction of mobility was posed as a problem of workability. Consequently, to solve the problem as mentioned above, concrete cans secure fire resisting capacity through the using of coating liquid, including Ester-lubricant and non-ionic characteristic surfactant. This research has been drawn a ideal condition in compressive strength areas of concrete by an experiment. When applying 13mm of polyamide fiber, proper fiber mixing volume by compressive strength areas of concrete more than 2.5kg in 160MPa. These amount of a compound can control the explosion.

• Proceedings of the Korean Fiber Society Conference
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• 2002.04a
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• pp.439-442
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• 2002

나일론 m형의 폴리아미드계 고분자의 경우 m의 수가 홀수일 때 N-H와 C=O 사이의 dipole 배열에 의하여 거대한 dipole moment가 나타나기 때문에 극성 결정구조를 나타내게 되며(1), 그 중에서도 특히 나일론 7과 11은 압전성을 나타낸다. 한편, 나일론 11[poly(undecanolactam)]은 $\alpha$, $\beta$, ν, $\delta$, $\delta$' 형과 같이 적어도 다섯 개의 결정형태를 갖는데[2-3], 이러한 여러 가지의 결정형태는 시료의 제조조건과 열처리 조건 등에 따라서 달라진다. (중략)

• Proceedings of the Korean Fiber Society Conference
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• 2002.04a
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• pp.115-118
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• 2002

셀룰로오스는 가장 범용적으로 쓰이는 천연고분자이지만, 합성고분자에 비하여 가공이 어렵다는 단점을 가지고 있다. 이러한 문제점을 해결하기 위하여 셀룰로오스와 합성 고분자를 블렌딩하는 방법이 고안되었다. 합성고분자가 셀룰로오스와 상용성을 갖기 위해서는 그것이 셀룰로오스와 분자간 상호작용을 이룰 수 있어야 한다. 폴리아미드, 폴리에스터, 그리고 비닐계 고분자는 이러한 조건을 만족할 수 있을 것으로 예상되어 이들 고분자와 셀룰로오스의 블렌드계에 대한 연구가 진행되고 있다. (중략)

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.11a
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• pp.15-16
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• 2017

In this study, the flexural behavior of fiber-reinforced concrete by fiber type were evaluated. As a result, the flexural strength of the hooked steel fiber-reinforced concrete(HSFRC) was lower than that of the amorphous metallic fiber reinforced concrete(AFRC), however it was shown strain-softening behavior by the pull-out of fiber. The flexural strength and the equivalent flexural strength of polyamide fiber-reinforced concrete(PAFRC) were lower than other specimens, but the equivalent flexural strength ratio was similar to that of AFRC. The flexural behavior of the fiber-reinforced concrete was associated with the bonding and pull-out properties of the fiber and matrix depending on the fiber type.

• Polymer(Korea)
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• v.36 no.6
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• pp.712-720
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• 2012

Thermal degradation for glass fiber-reinforced polyamide 66 composite (PA 66) with respect of thermal exposure time has been investigated using optical microscopy, scanning electron microscopy and Fourier transform infrared spectroscopy. As the thermal exposure time was prolonged, a slight increase in tensile strength for only initial stage and afterward, a proportional decrease of tensile strength was observed. These results can be explained by the increase of crystallinity, followed by the increase of crosslinking density, chain scission and the decrease in chain mobility, due to thermal oxidation with the exposure time. Fourier transform infrared spectroscopy results showed the increase of ketone peak and silica peak on the surface of thermally exposed PA 66. In addition, the thermal decomposition kinetics of PA 66 was analyzed using thermogravimetric analysis at three different heating rates. The relationship between activation energy and lifetime-prediction of PA 66 was investigated by several methodologies, such as statistical tool, UL 746B, Ozawa and Kissinger. The activation energy determined by thermogravimetric analysis had a relatively large value compared with that from the accelerated test. This may result in over-estimating the lifetime of PA 66. In this study, a master curve of exponential fitting has been developed to extrapolate the activation energy at various service temperatures.

• Journal of Korean Society for Quality Management
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• v.12 no.1
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• pp.35-44
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• 1984

Spandex is a elastomeric fiber in which the-fiber-forming substance is a long chain polymer consisting of at least 85% segmented polyurethane. In the polyurethanes there are the additional oxygen atoms in the main chains of the molecule. The effect of these oxygen atoms is to make the molecule flexible. From a physical point of view, elasicity and recovery from stretch are the most important properties of polyurethane, so its use had now expanded into many knitting industry. In this paper, we wish to Test the effect of some finishing conditions on the quality of polyurethane.

• Journal of the Korean Applied Science and Technology
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• v.12 no.1
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• pp.13-18
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• 1995

• Journal of the Korean Society of Clothing and Textiles
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• v.35 no.8
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• pp.1006-1013
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• 2011

An enzymatic treatment method using alcalase was introduced to improve the moisture characteristic of the polyamide fiber. The alcalase treatment conditions such as the pH, treatment temperature, enzyme concentration, and treatment time were optimized by measuring the amino groups. The changes in the weight loss, tensile strength, moisture regain, water contact angle (WCA), and water absorption rate of the polyamide fiber with the changes in the alcalase treatment conditions were evaluated. The optimum alcalase treatment conditions for polyamide fiber were found to be a treatment temperature of 50oC, a treatment time of 50 minutes, an alcalase concentration of 10% (owf), and a pH of 7.0. The ethylenediaminetetraacetic acid (EDTA) and L-cysteine accelerated the activity of the enzyme; however, they did not have an effect on the amino group production of the fiber surface. The alcalase treatment of the polyamide fiber improved the fiber's moisture regain, WCA, and absorption rate due to the amino group on the fiber surface. The results showed that the alcalase treatment of polyamide fiber is an effective method to improve the moisture characteristic of the polyamide fiber.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.3 no.4
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• pp.95-100
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• 2004

Plastics is used to produce precise parts with an inclusion of a reinforcement material such as glass fiber or carbon fiber to improve the dimension accuracy. The plastic goods can be produced with inaccurate dimensions, low mechanical strength, or residual stress due to the over packing of cavity inside, if the filling balance of melt resin is not accomplished. To overcome this problem, it is necessary to design the runner system with the geometrical balance at the mold design stage. However, even if the balanced runner system is achieved, a severe filling imbalance is observed practically in a multi-cavity mold. In this study, experiments were performed with Taguchi method to achieve the filling balance in multi-cavity mold with a symmetric runner system, by the use of pure PA and PA with glass fiber 33%. The experimental results were investigated to understand the effect of related molding factors on the filling imbalance for two resins.