• Title, Summary, Keyword: ABS

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Effects of Compatibilizer and Graphene Oxide on the Impact Strength of PC/ABS Blend (PC/ABS의 충격강도에 미치는 상용화제와 그래핀 옥사이드의 영향)

  • Park, Ju Young;Lee, Bom Yi;Cha, Hye Jin;Kim, Youn Cheol
    • Applied Chemistry for Engineering
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    • v.26 no.2
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    • pp.173-177
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    • 2015
  • In this study, effects of both the grafted ABS-g-MAH and the added graphene oxide (GO) on the impact strength of polycarbonate (PC)/poly(acrylonitrile-butadiene-styrene) (ABS) blends were discussed. The PC/ABS blends and PC/ABS/GO composites were fabricated by using twin screw extruder with ABS-g-MAH as a compatibilizer. The ABS-g-MAH was prepared by melting extrusion of ABS and maleic anhydride (MAH) with DCP (dicumyl peroxide) as an initiator using twin screw extruder and the synthesis of ABS-g-MAH was confirmed by the presence of carbonyl group (C=O) peak at $1780cm^{-1}$ of FT-IR spectrum. According to the thermal, rheological, and impact properties of PC/ABS blends, 5 phr (parts per hundred resin) of compatibilizer was chosen as an optimum content for the PC/ABS/GO composites. It was observed that the thermal decomposition of ABS/PC/GO composites increased with GO contents, but there was no significant changes or a decrease in the impact strength. Also the composite fabricated by ABS/GO showed small increase in the impact strength. From the result of the dynamic rheometer to observe the processing properties, the complex viscosities of PC/ABS blend including the compatibilizer increased, but the complex viscosities of composites added GO were not changed.

Genetic Analysis of absR, a new abs locus of Streptomyces coelicolor

  • Park, Uhn-Mee;Suh, Joo-Won;Hong, Soon-Kwang
    • Journal of Microbiology and Biotechnology
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    • v.10 no.2
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    • pp.169-175
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    • 2000
  • The filamentous soil bacterium Streptomyces coelicolor is known to produce four distinct antibiotics. The simultaneous global regulation for the biosynthesis of those four antibiotics was previously confirmed by absA and absB mutations that blocked all four antibiotics' biosynthesis without influencing their morphological differentiation. To study the complex regulatory cascade that controls the secondary metabolism in Streptomyces, a new abs-like mutation was characterized. namely absR, which is slightly leaky on a complete R2YE medium, yet tight on a minimal medium. A genetic analysis of the absR locus indicated that it is located at 10 o'clock on the genetic map, near the site of absA. A cloned copy of the absA gene that encoded bacterial two-component regulatory kinases did not restore antibiotic biosyntheis to the absR mutant. Accordingly, it is proposed that absR is another abs-type mutation which is less tight than the previously identified absA or absB mutations income medium conditions, and can be used to characterize another global regulatory gene for secondary metabolete formation in S. coelicolor.

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A Study on Mechanical Properties of PBT/ABS Blends with Compatibilizers (PBT/ABS 블렌드의 상용화제에 따른 기계적 물성 연구)

  • Yun, Ki-Ho;Lee, Joong-Hee;Choi, Jae-Ho
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.10
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    • pp.2165-2171
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    • 2002
  • Poly-butylene-terephalate(PBT) can be impact-modified by blending with ABS material. The effects of compatibilizers and ABS content on the mechanical properties of PBT/ABS blend were examined in this study. EPDM-g-GMA and polycarbonate(PC) were used as a compatibilizer. As the GMA content in EPDM-g-GMA increased, the tensile strength of PBT/ABS blend increased and the impact strength decreased. With increasing the EPDM-g-GMA content in PBT/ABS blend, the tensile strength and impact strength decreased. With PC compatibilizer, the particle size of ABS in PBT/ABS blend became smaller than that of the blend without compatibilizer and the particles were more evenly dispersed in matrix. The maximum impact strength of the PBT/ABS blend was observed in the range of 20~30% ABS content.

Rheological, Mechanical and Morphological Properties of Poly(acrylonitrile-butadiene-styrene)/Polycarbonate Blends with ABS-g-MAH (ABS-g-MAH를 포함한 Poly(acrylonitrile-butadiene-styrene)과 Polycarbonate 고분자 블렌드의 유변학적, 기계적, 형태학적 물성)

  • Song, Ki-Heon;Hong, John-Hee;Sung, Yu-Taek;Kim, Youn-Hee;Han, Mi-Sun;Yoon, Ho-Gyu;Kim, Woo-Nyon
    • Polymer(Korea)
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    • v.31 no.4
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    • pp.283-288
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    • 2007
  • Polymer blends containing poly(acrylonitrile-butadiene-styrene) (ABS) and polycarbonate(PC) (70/30, wt%) with compatibilizer were prepared using twin screw extruder. Compatibilizers were prepared by reactive extrusion with the ABS, maleic anhydride(MAH) and dicumyl peroxide(DCP) using twin screw extruder In the ABS/PC (70/30) blends, tensile strength did not change significantly, but increased from 52.25 to 55.03 MPa when the ABS-g-MAH was added in the amount of 5 phr. From the results of rheological properties, storage modulus of the ABS/PC/ABS-g-MAH blends at low frequencies showed lager value than that of the ABS/PC(70/30) blend. From the results of the morphological properties of the ABS/PC(70/30) blend, it was observed that the drop size of the PC ranged from 1.2 to $1.5\;{\mu}m$ and did not change significantly with the addition of the ABS-g-MAH($1{\sim}10\;phr$). From the results of the storage modulus, complex viscosity, and tensile strength of the ABS/PC (70/30) blends, it is found that the ABS-g-MAH is an effective compatibilizer in the ABS/PC (70/30) blends when the ABS-g-MAH is added in the amount of 5 phr.

Joint Operation of ABS with Power Control and Derivation of an Effective ABS Ratio for LTE Hetnet Environments (LTE-A 이종망 환경에서 ABS와 Power Control의 동시적용과 ABS 비율 도출)

  • Sung, No-Hoon;Choi, Young-June;Jang, Ji-Woong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.12
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    • pp.2381-2388
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    • 2015
  • It has been known that interference occurs between macrocell ans small-cell base stations in a heterogeneous network (HetNet) of LTE-A. For solving this problem, 3GPP suggested eICIC (Enhanced Inter Cell Interference Coordination) that includes ABS (Almost Blank Subframe) and power control. This paper proposes to use ABS with power control and derives an effective ABS ratio as a function of the number of users and HeNBs. Through simulation, we confirm that integration of ABS and power control can mitigate interference than using ABS only. Furthermore, we verify that an effective ABS ratio is different depending on the number of users and HeNBs.

A Study on the Mechanical Properties of PBT/ABS blends (PBT/ABS 블렌드의 물성에 관한 연구)

  • 이중희;윤기호;박민정
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.149-152
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    • 2001
  • Poly-butylene-terephalate(PBT) can be impact modified by blending with ABS material. The effects of the type of compatibilizer and ABS content on the mechanical properties of PBT/ABS blend were examined in this study. EVA-g-GMA and three type of polycarbonates were used as the compatibilizer. As the GMA content in EVA-g-GMA was increased, the tensile strength of PBT/ABS blend increased and the impact strength of it decreased. With increasing the EVA-g-GMA content in PBT/ABS blend, the tensile strength and impact strength decreased. With PC compatibilizer, the tensile strength of PBT/ABS blend decreased as the ABS content increased. However, the maximum impact strength was observed in 20~30% ABS content range.

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Effects of Molecular Weight of PC on Mechanical Properties of PC/ABS Blends using High-Shear Rate Processing

  • Lee, Eun Ju;Park, Hee Jung;Kim, Se Mi;Lee, Seung Goo;Lee, Kee Yoon
    • Korean Chemical Engineering Research
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    • v.56 no.3
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    • pp.343-348
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    • 2018
  • Each of the two polycarbonates (PC) of different molecular weights was blended with acrylonitrile-butadiene-styrene (ABS) under high-shear rate processing to afford PC/ABS. Sizes of ABS dispersed phases and mechanical properties of PC/ABS blends were investigated and high-shear rate processing of PC/ABS was carried out by changing screw speed and processing time. Prepared specimens were examined by scanning electron microscope (SEM) to observe morphology changes. Sizes of ABS dispersed phases in PC/ABS blends were observed to decrease gradually as screw speeds increased. Tensile strengths and elongations of specimens were investigated by universal testing method (UTM) to study the influence of molecular weight of PC exerting on PC/ABS blends. As a result, PC1/ABS blends (PC1: higher molecular weight PC) exhibited more strengthened properties than PC2/ABS (PC2: lower molecular weight PC). The tensile strength of PC1/ABS showed an increasing tendency when the screw speed increased, and the elongation did not show a significant decrease, but increased slightly with increasing shear time at a constant screw speed of 1000 rpm.

Conducting Characteristics of ABS/PPy Composite Film Prepared by Electrochemical Polymerization (전기화학적 중합으로 제조된 ABS/PPy 복합 박막의 전도특성)

  • Kim, J.;Yoon, D.Y.;Kim, D.H.;Han, C.;Kim, S.
    • Journal of the Korean Electrochemical Society
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    • v.5 no.3
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    • pp.164-167
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    • 2002
  • ABS/Polypyrrole composite film has been synthesized by means of electrochemical polymerization in order to enhance the oxidant stability by using ABS(Acrylonitrile-Butadiene-Strene) as a host-polymer. While the acetonitrile as a solvent swells the host-polymer ABS on Pt plate, and then the pyrrole in an electrolyte penetrates the Pre-coated ABS film during electrochemical Polymerization. Comparing with the sin91e-component Polypynole film, the resulting conducting ABS/PPy composite nim shows the good reliability for the uniform resistance and the enhancement of the oxidant stabilization.

Tribological Failure Examples Involving Hydraulic Unit, Sensor, Computer of Anti-lock Brake System in Passenger Cars (승용차 ABS의 하이드로릭 유닛, 센서, 컴퓨터에 관련된 트라이볼로지적인 고장사례 고찰)

  • Lee, IlKwon;Han, JaeOh;Lee, JongHo;Lee, YoungSuk;Kim, ChooHa
    • Tribology and Lubricants
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    • v.30 no.3
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    • pp.183-188
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    • 2014
  • In this paper, we present our analysis of tribological failure examples for an anti-lock brake system(ABS) in a car. The study range of this paper is to improve the quality of ABS system by analyzing with sensor, computer, actuator and oil lines. In the first example, the brake leak from hydraulic supply line in a caliper on the rear left side of the ABS hydraulic modulator. This produces the sponge phenomenon, where the car does not brake even when the driver operates the brake pedal. The hydraulic unit operating ABS is actuator that play role regulating drive condition according with the oil pressure supplied with wheel of a car. In the second example, the service man does not completely tighten the fixed bolt after repairing the car. This causes the ABS warning lamp to light up as the ABS wheel speed sensor cannot detect whether the ABS has been activated. In the third example, the ABS electronic control unit is separated from the soldered part of the inner circuit board. Consequently, the ABS fails in control because the ABS motor pump receives no-signal for the hydraulic unit. The wheel speed sensor has to large durability because of giving signal of acting condition to computer by detected the acceleration and deceleration of wheel of a car. In the fourth example, the ABS warning lamp lights up of when cracks propagate in the circuit board soldering part. The circuit of this computer is very important part for input and output the operating signal of system. Such failures can aggravate the durability of the ABS. Thus, the ABS needs to be optimized to eliminate malfunction phenomenon.

Numerical Analysis for Machining Center Milling Education of Deformation by Vise Stress to Minimize (머시닝 센터 가공 교육 중 바이스 압축력으로 인한 형상 변형량에 관한 연구)

  • Kim, Jin-Woo;Bong, Ha-Yoon
    • Journal of Practical Engineering Education
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    • v.7 no.2
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    • pp.119-123
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    • 2015
  • ABS material is easy to process, impact resistance and heat resistance is strong. ABS material is often used as a substitute for the interior and exterior metal material for an automobile. As the demand of ABS increases, fabricating education using ABS has also been increasing its importance. As part of its education, ABS material is used in the mold fabricating part of the regional and national skills competition. At this time, the force of the vise for fixing the ABS material in the processing using the ABS material can affect the final shape after machining. However, it has not been an accurate description of the notes and instructions of working in education. Therefore, in this study, we study the impact the force of vise affect structural shape in the fabricating education using ABS material and during fabricating education of ABS material, trying to present the notes of the appropriate it.