• Polymer(Korea)
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• v.26 no.5
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• pp.559-567
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• 2002

Poly (vinyl chloride) was blended with blended with vinyl chloride-acrylonitrile copolymers (MO-01 : M$\sub$w/=199049, AN=22.79%, MO-02 : M$\sub$w/=238523, AN=47.03%, MO-03 : M$\sub$w/=289496, AN=52.49%, MO-04 : M$\sub$w/=341837, AN=58.68% by mixing dimethylformamide (DMF) solution of each polymer and their morphology, viscosity, viscoelastic and mechanical properties were studied. Blends of PVC and MO-01 showed a homogeneous morphology. On the contrary, the other copolymer blends showed a large phase separation with spherical domains. Miscibility of blends of PVC and MO-01 was shown to be better than that of blends of other copolymers from morphological and viscoelastic studies. Even though blends of PVC and MO-01 were observed to be the considerable compatibility at a composition of PVC/MO-01=90/10, the mechanical properties of blend films were not improved too much in most blend cases.

• Fibers and Polymers
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• v.3 no.2
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• pp.60-67
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• 2002

In the present study, the fluorescence behavior ova phenylethynyl-terminated imide (LaRC PETI-5) resin, a bismaleimide (BMI) resin, and various LaRC PETI-5/BMI blends with different blend compositions has been characterized as a function of heat-treatment temperature, using a steady-state fluorescence technique with a front-face illumination method far solid-state films. It is observed that there are distinguishable changes in the spectral shape, size, and position of fluorescence with varying heat-treatment temperature in the pure and blend samples. The result is qualitatively explained in terms of charge transfer complex formation as well as microenvironmental change with local mobility and viscosity occurring in the LaRC PETI-5, BMI, and their blends during the cure process. The result also implies that a steady-state fluorescence technique may be a useful tool to understand the processing conditions of polyimides and their blends in the film form on the basis of their thermo-photophysical responses.

• Membrane and Water Treatment
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• v.7 no.4
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• pp.355-365
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• 2016

The improvement of fouling resistance of porous polymeric membrane is one of the most important targets in membrane preparation for water purification in many process like wastewater treatment. Membranes can be modified by various techniques, including the treatment of polymer material, blending of hydrophilic polymer into polymer solution, and post treatment of fabricated membrane. This research proposed the modifications of morphology and surface property of hydrophobic membrane by blending polyethersulfone (PES) with three polymeric additives, polyvinylpyrrolidone (PVP), Pluronic F127 (Plu), and Tetronic 1307 (Tet). PES hollow fiber membranes were fabricated via dry-wet spinning process by using a spinneret with inner and outer diameter of 0.7 and 1.0 mm, respectively. The morphology changes of PES blend membrane by those additives, as well as the change of performance in ultrafiltration module were comparatively observed. The surface structure of membranes was characterized by atomic force microscopy and Fourier transform infra red spectroscopy. The cross section morphology of PES blend hollow fiber membranes was investigated by scanning electron microscopy. The results showed that all polymeric additives blended in this system affected to improve the performances of PES membrane. The ultra-filtration experiment confirmed that PES-PVP membrane showed the best performance among the three membranes on the basis of filtration stability.

• Korean Journal of Human Ecology
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• v.12 no.2
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• pp.253-263
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• 2003

The purposes of this study were to find out an evaluation scale that could predict wear comfort and to investigate the effect of the skin-contacting fiber type on the subjective sensation and microclimate. Sensorial evaluation was basically followed by the Human Perception Analysis (HPA) interviewing 144 consumers. Sixteen female subjects were participated in the sleeve wear test with and without wearing vapor permeable water repellent outerwear. Experimental sleeves were constructed using the same double knit by turning inside out to control other material effects except the skin-contacting fiber type, hence each different side of double knit, cotton side and the cotton/polypropylene blend side, was next to skin in each trial of the experiment. As results, it was noted that the term representing a combined feeling of thermal and wetness sensation, and muggy appeared to be a powerful language to measure perceptual responses of human subject among five dimensions of evaluation. although the ordinary users did not use the term very often. As for the comfort properties of double knits, it seemed that subjects slightly more preferred polypropylene/cotton blend to cotton as the skin-contacting fiber type when they wore outerwear and their skin were covered with sweat, although the result was rot statistically significant and need to be confirmed under higher work load.

• Fibers and Polymers
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• v.4 no.2
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• pp.59-65
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• 2003

PLA/LPCL/HPCL blends composed of poly(lactic acid) (PLA), low molecular weight poly($\varepsilon$-caprolactone) (LPCL), and high molecular weight poly($\varepsilon$-caprolactone) (HPCL) were prepared by melt blending for bioabsorbable fila-ment sutures. The effects of blend composition and blending time on the ester interchange reaction by alcoholysis in the PLA/LPCL/HPCL blends were studied. Their thermal properties and the miscibility due to the ester interchange reaction were investigated by $^1{H-NMR}$, DSC, X-ray, and UTM analyses. The hydroxyl group contents of LPCL in the blends decreafed by the ester interchange reaction due to alcoholysis. Thus, the copolymer was formed by the ester interchange reaction at $200^{\circ}C$ for 30-60 minutes. The thermal properties of PLA/LPCL/HPCL blends such as melting temperature and heat of fusion decreased with increasing ester interchange reaction levels. However, the miscibility among the three poly-mers was improved greatly by ester interchange reaction. Tensile strength and modulus of PLA/LPCL/HPCL blend fibers increased with increasing HPCL content, while the elongation at break of the blend fibers increased with increasing LPCL content.

• Fashion & Textile Research Journal
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• v.22 no.4
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• pp.515-522
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• 2020

This study examined the effect of the blend ratio of wool and polyester fibers, yarn and fabric structural parameters to the appearance property and the formability of worsted fabrics. The mechanical properties of twenty types of manufactured worsted and PET/wool blend fabrics were measured using KES-FB and FAST systems. Garment formability increases with the thickness and cover factor as well as increases with wool content. The correlation between KES-FB and FAST system showed a relatively high correlation with an extensibility of 0.98, bending and shear rigidity 0.71; both were higher than polyester synthetic fiber. The correlation coefficient of garment formability between KES-FB and FAST systems was 0.93 and the correlation coefficient between formability and fabric extensibility was 0.8. These results were higher than those of bending and shear rigidity. This revealed that garment formability was influenced by wool content, cover factor and fabric thickness; however, wool content and fabric thickness were the most important factors for the seam pucker. The garment formability of the worsted fabrics can be predicted by fabric mechanical properties measured from KES-FB and FAST systems.

• Polymer(Korea)
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• v.27 no.4
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• pp.299-306
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• 2003

It is well known that the interaction and adhesion between the glass fiber (GF) and polymer matrix has a significant effect in determining the properties of fiber-reinforced materials. Therefore, it is one of important considerations to modify the surface of glass fiber with an appropriate sizing. We investigated the treatment method of glass fiber with coupling agent to improve the interaction of the interfacial region. The correlation between interfacial property and interphase microstructure was also examined in an attempt to realize a proper morphology at the glass fiber surfaces.

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.227-230
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• 2003

열방성 액정고분자 (Thermotropic liquid crystal polymer, TLCP)는 초고강도 섬유로의 응용가능성을 갖고 있어 많은 관심이 집중되고 있으며, 액정고분자의 고강도와 고탄성, 우수한 내열성과 내화학성, 가공시 성형수축률 및 선팽창계수가 작기 때문에 고성능 섬유 및 엔지니어링 플라스틱, 그리고 고분자 복합재료 등 다양한 분야에 응용되고 있다 [1]. 또한 범용성 열가소성 수지와 TLCP와의 용융블렌드는 고분자 복합재료의 강도 및 탄성의 향상뿐만 아니라 우수한 가공성 및 고성능 발현이 가능하기 때문에 현재 많은 연구가 진행되고 있다 [2]. (중략)

• Proceedings of the Korean Fiber Society Conference
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• 2003.04a
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• pp.202-205
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• 2003

$\beta$-Sulfatoethylsulfone기를 갖는 일시적 수용성 반응성 분산염료는 분산제를 첨가하지 않고도 염욕내에서 단분자 상태를 유지할 수 있으며 염색 공정 중 온도와 pH조건의 변화에 따라 Scheme 1과 같이 비수용성 vinylsulfone form으로 변환된다[1]. 이 때 vinylsulfone기는 섬유와 화학결합을 할 수 있는 대표적인 반응기이므로 이 염료는 일시적 수용성 분사염료와 반응성 염료의 두 성질을 동시에 지닌다[2]. (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)