• 한국염색가공학회지
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• 제12권1호
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• pp.44-51
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• 2000

The conventional one bath exhaust dyeing system of nylon]/cotton blends with acid dye/direct dye involves a lot of neutral salt which affect dyeability of acid dyes. Because of conventional one bath exhaust dyeing system of nylonl/cotton blends with acid dye/direct dye needs acid dyes adjusted at a neutral liquor, suitable acid dye is limited. To improve dyeing property of nylon/cotton blends, cotton component was pretreated with cationizing agent containing chlorohydrine group in aqueous solution of sodium hydroxide. This study was carried out to investigate dyeing possibilities of nylon/cationized cotton blends with acid dye/direct dye in a non-neutral salt dyebath by one bath two step method. The concentration of direct dye was 1.0%, 0.7%, 0.3%o.w.f. respectively at a non, 1%, 3%owf of reserving agent for being almost equal color strength between nylon and 3% cationized cotton when nylon/3% cationized cotton blends was dyed with acid dye/direct dye at concentration of acid dye(1%o.w.f.) by one bath two step method.

• Korea-Australia Rheology Journal
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• 제14권3호
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• pp.121-128
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• 2002

A series of thermoplastic polymers and their blends were melt-processed with high intensity ultrasonic wave in an intensive mixer. For the effective transfer of ultrasonic energy, an experimental apparatus was specially designed so that polymer melt can directly contact with ultrasonic horn. It was observed that significant variations in the rheological properties of polymers occur due to the unique action of ultrasonic wave without any aid of chemical additives. It was also found that the direct sonication on immiscible polymer blends in melt state reduces the domain sizes considerably and stabilizes the phase morphology of the blends. The degree of compatibilization was strongly affected by viscosity ratio of the components and the morphology was stable after annealing in properly compatibilized blends. It is suggested that ultrasound assisted melt mixing can lead to in-situ copolymer formation between the components and consequently provide an effective route to compatibilize immiscible polymer blends.

• 한국전기전자재료학회논문지
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• 제15권2호
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• pp.153-161
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• 2002

Stable polyaniline-dodecylbenzenesulfonic acid(PANI-DBSA) fully dissolved in toluene was obtained by a direct one-step emulsion polymerization technique. By using the proper molar ratio of APS/aniline monomer and DBSA/aniline monomer, the highest conductivity(7 S/cm) of PANI was obtained. The UV-Vis absorption spectrum of PANI confirmed PANI is emeraldine salt form. PANI/styrene polymers (polystyrene and styrene-butadiene copolymer) blends were prepared by mixing PANI solution with polymers in toluene. These blends exhibited the conductivity of 10$\^$-4/-10$\^$-3/ S/cm at 1 wt. % of PANI content. The mechanical property of conducting blend was decreased and TGA thermograms of conducting blends were similar to that of PANI. It had been checked that the flatness of coating layers of conducting blends decreased with increasing conducting components. It was also found that the morphology of blends was setting closer to that of PANI at higher conducting component contents.

• Elastomers and Composites
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• 제25권3호
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• pp.203-210
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• 1990

The structure and properties of blends of ethylene-propylene-diene terpolymer(EPDM) and polyolefin blends have been investigated. The rheology and tensile properties of the EPDM/HDPE(high density polyethylene), EPDM/PP(polypropylene) binary and EPDM/PP/HDPE ternary blends were studied along with morphological analyses. Those properties were affected by preferential interaction of EPDM on HDPE, compared to that of EPDM on PP, for the binary blends. The preferetial interaction may stem from the molecular characteristics of EPDM to possess more ethylene units than propylene units in the elastomer. The EPDM played a role as compatibilizer for HDPE and PP in the EPDM/PP/HDPE ternary blends.

• Macromolecular Research
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• 제10권4호
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• pp.209-214
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• 2002

Miscibility of polysulfone (PSf) with various hydrophilic copolymers was explored. Among these blends, PSf gives homogeneous mixtures with poly(1-vinylpyrrolidone-co-styrene) copolymers [P(VP-S)] when these copolymers contained VP from 68 to 88 wt%. Microporous membranes for the ultrafiltration process were prepared from PSf blends with P(VP-S) copolymers. The membranes prepared from the PSf/(VP-S) blends exhibited higher water flux than the membranes prepared from PSf irrespective of the VP content. The solute rejection examined with the membranes fabricated from the miscible blends was similar to that of PSf membrane. However, the solute rejection examined with the membranes fabricated from the immiscible blends was lower than that of PSf membranes.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제53권6호
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• pp.305-311
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• 2004

Charge transport phenomena of polyaniline-DBSA/High Impact Polystyrene (PAM-DBSA/HIPS) blends have been studied through an examination of electrical conduction. HIPS used host polymer in the blends and PANI-DBSA obey a space charge limited conduction mechanism and a ohmic conduction mechanism respectively. However, PANI-DBSA/HIPS blends do not obey any classical conduction mechanism. Analysis of conduction mechanism revealed that the charging current of PANI-DBSA/HIPS blends increased with the increase of PANI-DBSA content. This result migrlt be explained by the reduction in the distance between PANI-DBSA particles enabling the charge carriers to migrate from a chain to a neighboring chain via hopping or micro tunneling. It was also found that the charging current of PANI-DBSA/HIPS blends decreased as the temperature was elevated, which is of typical phenomena in metals. It is speculated that the charge transport in PANI-DBSA particle was somewhat constrained due to strong phonon scattering.

• Elastomers and Composites
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• 제36권3호
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• pp.177-187
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• 2001

폴리프로필렌(PP)/폴리우레탄(PU) 블렌드를 compositional quenching으로 제조하여 모폴로지, 인장물성, 표면에너지 그리고 열안정성 등을 조사하였다. 블렌드 제조시, 말레인산 무수물이 그라프트된 PP(MPP)와 히드록시에틸 말레이미드가 그라프트된 PP(HPP)를 반응성 상용화제로 도입하였으며, 이들의 생성 및 PU 조성과의 반응을 FT-IR로 확인하였다. Compositional quenching으로 제조한 블렌드는 용융블렌드에 비해 높은 혼화성을 보였으며, 블렌드내의 상용화제의 함량이 증가함에 따라 모폴로지, 인장물성. 표면특성, 그리고 열안정성 등의 물성이 현저하게 향상되었다. 상용화제로 MPP를 도입한 블렌드는 HPP를 도입한 블렌드에 비해, 높은 표면 에너지를 가졌다.

• Bulletin of the Korean Chemical Society
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• 제32권11호
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• pp.4005-4010
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• 2011

We investigated thermal behavior of spin-coated films of P(HB-co-HHx)/PEG blends by using infraredreflection absorption (IRRAS) spectroscopy and 2D correlation spectroscopy. Based on 2D IRRAS correlation spectra, we could determine the sequence of spectral intensity changes with increasing temperature that PEG band changes first and then a band for crystalline component of P(HB-co-HHx) changes before a band for amorphous component. The intensities of bands for PEG and amorphous P(HB-co-HHx) were changed greatly as PEG weigh % of P(HB-co-HHx)/PEG blends increased. Transition temperatures of P(HB-co-HHx)/PEG blends were successfully determined by 2D gradient mapping method. The transition temperature of spincoated films of 98/2 and 90/10 P(HB-co-HHx)/PEG blends and 80/20 P(HB-co-HHx)/PEG blend determined by 2D gradient map are, respectively, about 137.5 and $132.5^{\circ}C$. Furthermore, P(HB-co-HHx)/PEG blends show an additional transition temperature that have been interpreted in terms of different lamellar thicknesses in spin coated films.

• Macromolecular Research
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• 제15권1호
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• pp.44-50
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• 2007

This study investigated the effect of ultrasound irradiation on the blend of poly(lactic acid) (PLA) and poly(butylene adipate-co-terephthalate) (PBAT). The blends of PLA/PBAT(50/50) (PBAT50) were prepared in a melt mixer with an ultrasonic device attached. Thermal, rheological, and mechanical properties, morphology, and biodegradability of the sonicated blends were analysed. The viscosity of the sonicated blends was increased by the ultrasound irradiation owing to the strong interaction. The morphology of the sonicated blends was significantly dependent on the duration o the ultrasound irradiation. For PBAT50, the phase size reduction was maximized when the blends were ultrasonically irradiated for 30 sec. At longer duration of ultrasound irradiation, the PBAT phase underwent flocculation. Measurement of the tensile properties showed an increased breakage tensile stress and an enhanced Young's modulus when the blends were properly irradiated. This improvement was ascribed to better adhesion between the PLA matrix and the PBAT domain and to better dispersion of the PBAT phase. However, the tensile properties were maximized after excessive energy irradiation, which was ascribed to an emulsifying effect leading to coalescence of the PBAT phase. Impact strength was increased to reach a peak with the ultrasound irradiation, and was higher than the untreated sample for all sonicated samples due to the difference of failure mechanism between the tensile test and the impact test.

• Elastomers and Composites
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• 제46권4호
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• pp.324-328
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• 2011

신발 밑창용 CIIR에 BR, SBR 및 NBR을 다양한 조성으로 혼합하여 블렌드물의 내마모성과 마찰계수에 미치는 영향을 고찰하였다. CIIR이 BR에 블렌딩됨에 따라 CIIR이 BR의 결정 형성을 방해하며, 이것이 BR/CIIR 블렌드물의 내마모성을 급격히 감소하는 요인 중의 하나로 작용하는 것으로 이해된다. BR/CIIR 블렌드물에서 BR의 함량이 증가함에 따라 $tan{\delta}$ 피크 면적이 저하하였으며, 블렌드물의 마찰계수도 유사하게 저하하는 경향을 나타내었다. CIIR에 BR을 첨가함에 따라 블렌드물의 응력완화율 및 반발탄성이 감소하였으며, 블렌드물의 반발탄성에 영향을 미치는 것으로 추정된다.