• Fibers and Polymers
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• 제4권4호
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• pp.210-214
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• 2003

Siloxylated polypropylene fibers composed of polypropylene (PP) and aluminosiloxane (AS) were prepared by melt blending followed by spinning. The effects of blend compositions on the thermal behaviors, surface and tensile properties of PP/AS blend fibers were investigated by DSC, WAXD, SEM, static honestometer, etc. The heat of fusion of PP/AS blends decreased with increasing AS contents. In addition, the peak intensity of PP/AS blends in X-ray diffraction patterns decreased with increasing AS contents. It was observed that the silicone molecules exist and well distribute on the surface of siloxylated polypropylene fibers. From the results of the half-life period measurements, the anti-static properties of PP fibers siloxylated with AS was found to be significantly modified.

• 한국응용과학기술학회지
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• 제29권1호
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• pp.95-101
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• 2012

완전 생분해성 고분자 블렌드필름을 제조하기 위하여 치환도가 다른 두 셀룰로오스 아세테이트(CA)에 5 - 50%의 저분자량 폴리락타이드(PLA)를 블렌딩하였다. 이 때 사용된 각각의 고분자는 10% 메탄올/메틸렌클로라이드 혼합용제에 녹여서 점도가 같은 조건의 농도로 제조하였다. 각 조성의 블렌드필름의 표면 모폴로지와 열적 성질, 기계적 성질을 조사하였다. 화학적 구조는 적외선 분광법으로 확인하였으며, 전자현미경을 통한 표면 분석 결과 5% 이하의 폴리락타이드를 함유한 블렌드필름은 상분리가 거의 일어나지 않았으며 20% 이상이 함유된 경우 상분리가 매우 심각하였다. 또한 블렌드필름의 인장강도는 셀룰로오스 아세테이트의 함량이 늘어날수록 TAC/PLA의 경우 $820kg_f/cm^2$ 및 DAC/PLA의 경우 $600kg_f/cm^2$까지 향상시킬 수 있었다.

• 한국전기전자재료학회논문지
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• 제16권9호
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• pp.826-832
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• 2003

Blending effects for generating a pretilt angle in nematic liquid crystal (NLC) with negative dielectric anisotropy on the blended polyimide (PI) of homeotropic and homogeneous alignment surface were studied. Also, we investigated the EO performances for the advanced VA- $\pi$ cell using this homeotropic blended PI surface. A many decrease of tilt angle on the polymer surface to blend homeotropic PI and homogeneous PI with side chain type was measured, and the tilt angle decreased as blended ratio and rubbing strength increase. However, a small decrease of tilt angle on the polymer surface to blend homeotropic PI and homogeneous PI with main chain type was measured. The blended effects for generating a pretilt angle were clearly observed, and the many decrease of tilt angle can be achieved by using the blended PI surface. The electro-optical (EO) characteristics using the advanced VA- $\pi$ cell using the homeotropic blended PI surface than that of conventional VA cell can be improved. We suggest that the developed advanced VA-$\pi$ cell on a homeotropic blended PI surface is a promising technique for the achievement of a fast response time, and a high contrast ratio.

• 접착 및 계면
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• 제14권3호
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• pp.121-127
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• 2013

본 연구에서는 열가소성 폴리우레탄(TPU)과 EPDM, NBR 및 BR을 용융 블렌딩하여 TPU/Rubber 블렌드 필름을 제조하고 이들의 조성이 마찰시 표면 파괴와의 관계를 연구하였다. TPU/EPDM과 TPU/BR 블렌드의 마찰시 표면 파괴 특성이 개선되었으며 특히 BR이 우수하였다. 또한, TPU/BR 블렌드에서 BR의 함량이 10 wt% 이상 투입될 때 표면 파괴 및 마킹 특성이 개선되었다. Scanning electron microscopy (SEM) 분석으로부터 BR 함량이 증가할수록 연질상의 증가로 인한 표면 파괴 및 마킹 특성의 개선으로 추정할 수 있었다.

• 한국의류산업학회지
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• 제3권5호
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• pp.486-491
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• 2001

The purpose of this study was to examine the effects of chemical finishes on performance characteristics of microfiber blend fabrics. A 60% polyester microfiber/40% cotton blend woven fabric was finished by ten chemicals: three silicone softeners, one fluorochemical, and their mixtures. Performance characteristics examined were abrasion resistance, and oil/water repellency. Chemical finishes containing dimethylpolysiloxane silicone performed better in fabric abrasion resistance than other chemicals. The correlation between abrasion wear and instrumental measures of fabric hand indicated that the breaking strength loss by abrasion related negatively to the coefficient of friction. This implied that the finished fabrics with lower surface frictional coefficient (slipperier) had higher breaking strength loss by abrasion. The microfiber structure of polyester did not appear to help in oil/water repellency due to the larger surface areas of the microfibers. The fluorochemical finished fabric had the most significant improvement on oil/water repellency. The silicone-only finishes, however, did not improve oil/water repellency. When mixed with the fluorochemical, silicone finishes showed improved oil/water repellency.

• 한국전기전자재료학회논문지
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• 제17권11호
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• pp.1192-1198
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• 2004

Hole transporting polymer(poly［N-(p-diphenylamine)phenylmethacrylamide］, PDPMA) was doped with nile red dye at various concentrations to study the influence of doping on the energy transfer during light emitting processes. Organic LEDs composed of ITO/blend(PDPMA -nile red)/ Alq$_3$/Al as well as thin films of blend(PDPMA -nile red)/ Alq$_3$ were manufactured for investigating photoluminescence, electroluminescence, and current-voltage characteristics. Atomic Force Microscopy was also used to observe surface morphology of the blend films. It was found that such doping. significantly influences the efficiency of the energy transfer from the Alq$_3$ layer to blended layer and the optical/electrical properties could be optimized by choosing the right concentration of the dye molecule. The results also showed a interesting correlation with the morphological aspect, i.e. the optimum luminescence at the concentration with the least surface roughness. When the concentration of nile red was 0.8 wt%, the maximum energy transfer could be achieved.

• 한국도로학회논문집
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• 제15권5호
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• pp.101-110
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• 2013

PURPOSES : The purpose of this study is to evaluate the durability of ternary blended concrete mixtures adding ultra fine admixture. METHODS : From the literature review, crack was considered as the main distress failure criterion on concrete bridge deck pavement. To reduce the initial crack development due to drying shrinkage, CSA expansion agent and shrink reduction agent were used to ternary blended concrete mixtures as a admixture. Laboratory tests including chloride ion penetration test, surface scaling test, rapid freeze & thaw resistance test, non restrained drying shrinkage and restrained drying shrinkage test were conducted to verify the durability of ternary blended concrete mixtures. RESULTS : Based on the test results, proposed mixtures were verified as high qualified durable materials. Expecially initial drying shrinkage crack was not occurred in ternary blended concrete mixtures with CSA expansion agent. CONCLUSIONS : It is concluded that the durability of proposed ternary blend concrete mixture was acceptable to apply for the concrete bridge deck pavement.

• 폴리머
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• 제24권3호
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• pp.358-365
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• 2000

Miscibility itnd thermal behavior of blends of synthetic biodegradable aliphatic polyester (Bionolle) with poly(epichlorohydrin) (PECH) were investigated by a differential scanning calorimetry (DSC), a dynamic mechanical thermal analyzer (DMTA) and a rotational rheometer. Observed both single glass transition temperatures from the DSC in agreement with the Fox equation and single T$_{g}$ changes as a function of composition from the DMTA indicate that these blend mixtures are miscible. In addition, the miscibility of this blend system was also observed from the single curve of the Cole-Cole Plot of log G′($\omega$) vs. log C"($\omega$) from the dynamic test using a rotational rheometer. This was further verified from the cryogenically fractured surface of BDP/PECH blends by scanning electron microscopy.

• 패션비즈니스
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• 제10권6호
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• pp.16-27
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• 2006

The purpose of this study was to examine the effects of chemical finishes on performance characteristics of microfiber blend fabrics. A 60% polyester microfiber /40% cotton blend woven fabric was finished by ten chemicals: three silicone softeners, one fluorochemical, and their mixtures. Performance characteristics examined were fabric hand attributes. Fabric hand was evaluated by instrumental measures using Kawabata KES-F system instruments. Silicone-only finishes did not change the bending properties significantly from those of the control fabric. The fluorochemical-only finish made the fabric stiffer and crisper. When the two chemicals were mixed they tended to offset this adversary effect. Most of the chemical finishes made the surface finer and smoother. Fluorochemical-only finish improved fabric strength. Likewise, dimethylpolysiloxane silicone improved fabric strength. Amino-functional hydrophilic and diamino-functional silicone softeners, on the other hand, reduced fabric strength. However, when mixed with the fluorochemical, the adversary effect was diminished.

• Elastomers and Composites
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• 제39권3호
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• pp.193-208
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• 2004

사출성형된 고분자 블렌드의 형태학적 상구조를 실험 및 이론적인 방법으로 연구하였다. 실험적인 연구로서, 형태학적 상구조에 미치는 사출속도, 사출온도 효과를 조사하였다. 이를 통하여 고분자 블렌드로 제조된 사출성형품에서 두께 위치에 따른 형태학적 상구조 변화를 뚜렷하게 관찰할 수 있었으며, 사출성형품 표면에 분산상이 가늘고 길게 변형되어있는 스킨층, 그안 쪽에 분산상이 다소 크고 변형이 되어있는 서브스킨층 및 사출성형품의 중심에 위치하고 분산상의 변형이 전혀 없는 코어영역이 존재함을 알 수 있었다. 실험적인 연구 결과를 토대로 고분자 블렌드의 사출과정에서 형성되는 형태학적 상구조를 예측하는 계산 알고리듬을 제시하였다. 상업화된 사출성형 해석용 프로그램에서 얻은 유동장 정보와 유동장에서 분산상의 거동에 관한 이론 및 실험식을 조합하여 사출성형된 고분자 블렌드의 형태학적 상구조를 예측할 수 있었다. 제시된 계산 알고리듬으로 사출온도 및 사출속도에 의한 형태학적 상구조의 변화를 잘 예측할 수 있었다.