• Title, Summary, Keyword: Blend

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Structural Characteristics and Properties of Silk Fibroin/Polyurethane Blend Films

  • Um, In-Chul;Kweon, Hae-Yong;Chang mo Hwang;Min, Byung-Goo;Park, Young-Hwan
    • International Journal of Industrial Entomology
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    • v.5 no.2
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    • pp.163-170
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    • 2002
  • In this paper, silk fibroin (SF)/polyurethane (PU) blend films were fabricated to develop a new biomaterial for biomedical applications. These blend films were prepared using formic acid as a cosolvent, and structural characteristics and properties of blend films were investigated. FTIR results suggested that there was no specific interaction between SF and PU, implying molecular immiscibility in SF/PU blend films. Furthermore, it was revealed by XRD method that the crystalline region of blend components was not perturbed by counterpart polymers. The degree of phase separation of SF/PU blend films was diminished by increasing PU content in blend. Especially, the blend with 70% content of PU showed no evidence of macro-phase separation in SEM observation. However, SF/PU blend (70/30) was revealed to be phase-separated in a lower dimension confirmed by DMTA measurement. TGA result showed that thermal decomposition temperature of blend film was slightly decreased compared to those of SF and PU polymer itself, Though mechanical properties of SF/PU blend films were not good enough due to the solvent, blood compatibility of PU can be enhanced markedly by mixing with SF for SF/PU blend film.

Effects of In Vitro Degradation on the Weight Loss and Tensile Properties of PLA/LPCL/HPCL Blend Fibers

  • Yoon Cheol Soo;Ji Dong Sun
    • Fibers and Polymers
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    • v.6 no.1
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    • pp.13-18
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    • 2005
  • PLA/LPCL/HPCL blend fibers 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 and spinning for bioab­sorbable filament sutures. The effects of blending time and blend composition on the X-ray diffraction patterns and tensile properties of PLA/LPCL/HPCL blend fibers were characterized by WAXD and UTM. In addition, the effect of in vitro degra­dation on the weight loss and tensile properties of the blend fibers hydrolyzed during immersion in a phosphate buffer solu­tion at pH 7.4 and 37$^{\circ}C$ for 1-8 weeks was investigated. The peak intensities of PLA/LPCL/HPCL blend fibers in X-ray diffraction patterns decreased with an increase of blending time and LPCL contents in the blend fibers. The weight loss of PLA/LPCL/HPCL blend fibers increased with an increase of blending time, LPCL contents, and hydrolysis time while the tensile strength and modulus of the blend fibers decreased. The tensile strength and modulus of the blend fibers were also found to be increased with an increase of HPCL contents in the blend fibers. The optimum conditions to prepare PLA/LPCL/HPCL blend fibers for bioabsorbable sutures are LPCL contents of $5 wt\%, HPCL contents of $35 wt\%, and blending time of 30 min. The strength retention of the PLA/LPCL/HPCL blend fiber prepared under optimum conditions was about $93.5\% even at hydrolysis time of 2 weeks.

Effects of Treatments with Two Lipolytic Enzymes on Cotton/Polyester Blend Fabrics

  • Lee, So Hee;Song, Wha Soon
    • Journal of the Korean Society of Clothing and Textiles
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    • v.37 no.8
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    • pp.1107-1116
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    • 2013
  • This study examined the use of cutinase and lipase to process cotton/polyester blend fabric. Optimum treatment conditions for cutinase and lipase were investigated for cotton/polyester blend fabric. The properties of enzyme-treated fabrics were evaluated and compared in optimal treatment conditions. In addition, the possibility to provide an enzymatic finishing on blend fabrics using mixed enzymes in a two-step process were studied. The weight loss of cotton/polyester blend fabrics with Triton X-100 was 0.8% and the dyeing property of blend fabrics with calcium chloride increased by a factor of 1.2. The use of two enzymes in combination with cutinase and lipase in the presence of auxiliaries resulted in a cotton/polyester blend fabric weight loss of 0.8%. In addition, the dyeing properties of cotton/polyester blend fabrics improved by a factor of 1.5 and the moisture regain of cotton/polyester blend fabrics improved by a factor of 1.16. However, no marked loss was observed in tensile strength. The surface morphology of cotton/polyester blend fabrics is modified through a two-enzyme treatment. The treatment of cotton/polyester blend fabrics with cutinase and lipase maintains cotton strength and improves the moisture regain of polyester fabrics.

PERMEATION OF CARBON DIOXIDE AND NITROGEN GASES THROUGH POLY(AMIDE-IMIDE)/POLYURETHANE AND POLYCARBONATE/POLYURETHANE BLEND MEMBRANES

  • Kim, Min-Joung;Sea, Bong-Kuk;Park, You-In;Youm, Kyung-Ho;Lee, Kew-Ho
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.87-89
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    • 2003
  • Thermoplastic polyurethane(PU)-based blend membranes were prepared by the solvent evaporation process. The gas sorption, diffusion, and permeation properties of PU-based blend membranes have been studied. The morphology of PU-based blend membranes was investigated by SEM. The result showed that phase separation occurred with increasing blend ratio. $CO_2$ permeation behaviors of blend membranes were affect by blend composition. Thermoplastic polyurethane(PU)-based membranes showed high $CO_2$ permeation and $CO_2$/$N_2$ selectivity of the blend membrane was improved with increasing the blend ratio.

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Effect of Fiber Characteristics and Blend Ratios on the Torsional Behavior of Wool/polyester Blend Yarns - Experimental - (섬유특성과 혼합률이 모/폴리에스테르 혼방사와 비틀림 거동에 미치는 영향(II) - 실험적 고찰 -)

  • 김승진;안철우
    • Textile Science and Engineering
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    • v.30 no.1
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    • pp.65-75
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    • 1993
  • Estimated values in previous study were applied to various wool/polyester blend yarns which made with different blend ratios. and then compared and discussed with experimental results. It was shown how the yarn twist and blend ratios in the spun blend yarns affect the torsional hysteresis behavior. And the contributions of interfiber friction by calculating energy loss and coercive couple in torque-torzion hysteresis curve were discussed. Specific torsional rigidity of a spun blend yarn was linearly increased with increasing yarn tension and the extrapolated specific torsional rigidity was adopted by specific net yarn torsional rigidity. The effect of blend ratio on the net specific torsional rigidity of spun blend yarns was exactly shown in the region from 30$^{\circ}$ to 35$^{\circ}$ of yarn surface helix angle. And the specific net yarn torsional rigidity was decreased with increasing blend ratio of polyester fiber. The maximum specific net torsional rigidity of blend yarns was obtained with increasing the surface helix angle of the yarn. The trend was the same as tensile modulus(E) and bending rigidity(EI) Torsional hysteresis energy due to the interfiber friction of constituent fibers and the coercive torque due to initial resistance of constituent fibres by the torsional deformation were also increased with increasing yarn tension. The effect of blend ratio on the hysteresis energy was more evident than those of torsional rigidity and coercive torque. This was also decreased with increasing the blend ratio of polyester fiber the same as the yarn torsional rigidity. And maximum hysteresis energy loss was shown to the high level of the yarn surface helix angle. But not in the coercive torque.

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A Study on The Physical Properties of Textile Materials( I ) -Effect of Blend Ratio of Wool/Polyester Fabrics on the Change of Physical Properties- (의복재료의 물리적 특성에 관한 연구(I) -Wool/polyester 혼방직물의 혼방률에 따른 물성변화-)

  • Kim Tae Hoon;Kim Seung Jin
    • Journal of the Korean Society of Clothing and Textiles
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    • v.9 no.1
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    • pp.47-55
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    • 1985
  • To determine the change of the mechanical properties of the wool/polyester blend fabrics in proportion to blend ratio, 10 mechanical properties were measured on 6 blend fabrics by KES-F system. Blend ratio on the 6 blend fabrics was increased by $20\%$, and the structure of the fabric were plain, 2/2 twill, respectively. And wearing performances in propoetion to blend ratio on the 6 blend fabrics were investigated. In this experiment. the following conclusions were obtained with the increase of blend ratio of polyester. 1) The values of WT, RT in tensile properties. tensile energy and elongation, and RC in compressional properties were decreased. 2) The values of B, 2HB in bending properties, 2HG. 2HG 5 in shearing properties were increased. 3) Putting on clothes, wearing performance was bad because crumbling of shape and wrinkle were easily made an appearance. Particularly it was remarkably bad as blend ratio of polyester was expressed $60\%$.

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The Thermal Degradation Mechanism of Polymethyl Methacrylate Blend (Polymethyl Methacrylate Blend의 열화에 따른 분해기구 해석에 관한 연구)

  • Kim, Dong-Keun;Moon, Myeong-Ho;Seul, Soo-Duk;Sohn, Jin-Eon
    • Elastomers and Composites
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    • v.23 no.2
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    • pp.125-133
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    • 1988
  • The thermal degradation of polymethyl methacrylate(PMMA) blend namely polymethyl methacrylate-polycarbonate(PMMA-PC) blend and polymethyl methacrylate-polystyrene(PMMA-PS) blend were carried out by isothermal method under air at several heating temperature from 220 to $270^{\circ}C$. Molecular weight changes during the thermal decomposition were monitored by means of the viscosity average molecular weight($\bar{M}v$). The viscosity average molecular weight was determined by Gel Permeation Chromatography(GPC). The dominant process in the degradation of PMMA-PC and PMMA-PS blend were main chain scission randomly due to weak links that may be distributed along the polymer backbone and the initial rate which the bonds are broken is not sustained. The infra-red spectra of degraded PMMA-PS blend show that the presence of aromatic ketone band at $1685cm^{-1}$. However, the infra-red spectra of degraded PMMA-PC blend show that the presence of hydroperoxide band at $3450cm^{-1}$. Thus indicating that the weak links are attacked by oxygen from the air and produce hydroperoxide or ketone. The activation energies of PMMA-PC blend and PMMA-PS blend were 18.2 and 17.9 Kcal/mol, respectively.

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Effect of Ultrasonic Energy in the Engine using Diesel Fuel Blended Rape-seed Oil (유채혼합유를 사용하는 기관에서 초음파에너지의 영향)

  • Kwon, K.R.;Ko, K.N.
    • Journal of the Korea Society For Power System Engineering
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    • v.9 no.4
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    • pp.5-10
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    • 2005
  • The effect of ultrasonic energy for diesel fuel and blend oil has been revealed in this paper. The experimental setup consisted of a high speed diesel engine with 4 cylinder, dynamometer and ultrasonic fuel feeding system. Ultrasonic energy was added to diesel fuel and blend oil, which is a blend of diesel fuel and rape-seed oil. As engine speed was changed, engine torque and power, brake specific fuel consumption and thermal efficiency were measured in detail. As the results, by adding ultrasonic energy to diesel fuel and blend oil, the engine performance was improved in range of the experiment. The effect of improvement on brake specific fuel consumption and thermal efficiency for blend oil is higher than that for diesel fuel. When ultrasonic energy was added to diesel fuel or blend oil, a rise in engine torque for diesel fuel was higher than that for blend oil, but the effect of ultrasonic energy was small. From these results, it may be desirable to add ultrasonic energy to blend oil for the use of blend oil to diesel engine.

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The Effect of Coagulant on the Post Drawing and Morphology of Wet Spun Regenerated SF/Nylon 6 Blend Filaments

  • Um, In-Chul
    • International Journal of Industrial Entomology
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    • v.16 no.2
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    • pp.61-66
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    • 2008
  • In this paper, the regenerated silk fibroin (SF)/nylon 6 blend filaments were fabricated using wet spinning technique and the effect of coagulant on the post drawing and morphology of blend filaments was investigated. In the result of wet spinnability, methanol, acetone, DMF, and THF showed relatively good coagulation strength and fiber formation for the regenerated SF. On the contrary, they did not exhibit strong enough to produce a uniform nylon 6 filament due to the lack of coagulation strength. In the examination of post drawing performance, methanol showed the highest maximum draw ratio of the blend filament over all blend ratios. The maximum draw ratio of SF/nylon 6 blend filaments decreased with the reduction of SF content regardless of type of coagulant. SEM observation showed the consistent result with that of post-drawing performance. As SF content decreased, the uniform and regular structure was changed to irregular one. In particular, the severe macro-phase separation between SF and nylon 6 could be detected in the 50/50 SF/nylon 6 blend filaments coagulated in methanol and THF.

Dyeability Improvement of Polypropylene Fibers by Poly(trimethylene terephthalate) Blending (I) -Preparation and Thermal Properties of PP/PTT Blend Films- (Poly(trimethylene terephthalate) 혼합에 의한 폴리프로필렌 섬유의 염색성 개선 (I) -PP/PTT 블렌드 필름의 제조 및 열적 특성-)

  • Park, Kyung-Chul;Ham, Myong-Jo;Kim, Young-Ho
    • Textile Science and Engineering
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    • v.47 no.3
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    • pp.198-204
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    • 2010
  • To improve the dyeability of polypropylene (PP) fibers, PP/poly(trimethylene terephthalate) (PTT) blend fibers with various PTT contents were prepared using a commercial pilot spinning apparatus. The PP/PTT blend fibers were melt-pressed at $260^{\circ}C$ and quenched in ice-water to form PP/PTT blend films, and the thermal properties of the blend films were analyzed. DSC analysis showed that the melting temperature of the PP in the blends was unaffected by PTT blending and that PP and PTT crystallized independently. However, the melt crystallization temperature ($T_{mc}$) increased slightly with increasing the PTT content in PP/PTT blends. Synchrotron WAXS analysis of the annealed PP/PTT blend films showed that the crystal structure of PP in the blend films was the $\alpha$-form irrespective of the presence of PTT. SEM showed that PTT existed as spherical particles in the PP/PTT blends and that the particle size increased with increasing PTT content, which indicates that PTT was immiscible with PP. This immiscibility helped enhance the dyeing properties of the blend PP fibers.