• Advanced Composite Materials
• /
• 제16권2호
• /
• pp.181-194
• /
• 2007

This paper presents the mechanical properties of a composite consisting of acrylonitrile-butadiene-styrene (ABS) resin mixed with carbon fiber reinforced plastics (CFRP) pieces (CFRP/ABS). CFRP pieces made by crushing CFRP wastes were utilized in this material. Nine kinds of CFRP/ABS compounds with different weight fraction and size of CFRP pieces were prepared. Firstly, tensile and flexural tests were performed for the specimens with various CFRP content. Next, fracture surfaces of the specimens were microscopically observed to investigate fracture behavior and fiber/resin interface. Finally, the tensile modulus and strength were discussed based on the macromechanical model. It is found that the elastic modulus increases linearly with increasing CFRP content while the strength changes nonlinearly. Microscopic observation revealed that most carbon fibers are separated individually and dispersed homogeneously in ABS resin. Epoxy resin particles originally from CFRP are dispersed in ABS resin and seem to be in good contact with surrounding resin. The modulus and strength can be expressed using a macromechanical model taking account of fiber orientation, length and interfacial bonding in short fiber composites.

• E2M - 전기 전자와 첨단 소재
• /
• 제1권2호
• /
• pp.126-135
• /
• 1988

Acrylonitrile-Acrylic acid 공중합체와 이를 amidation시킬 공중합체에 구리착물을 형성시켜 IR spectrum분석, 점도측정, 전자현미경관찰, 열분석, 전기전도성등을 검토하였다. AN-AA 공중합체-Cu(II)와 아미드화 AN-AA 공중합체-Cu(II)착물은 pH9의 범위에서 가장 안정한 값을 가지며 착물이 형성되거나 Cu$_{x}$S가 도입된 공중합체는 그 구조가 ompact해짐을 알 수 있었다. 공중합체에 Cu(II)착물이 형성되면 열안정성이 감소되며 Cu(II)착물은 아세톤 용액에서 요오드로 dope 될 때 저항값이 $10^{5}$-$10^{6}$.OMEGA..cm를 나타냈다. 저항값은 CuCl$_{2}$와 I$_{2}$의 양에 영향을 받으며 20wt% 이상의 CuCl$_{2}$와 1.0wt% I$_{2}$로 처리하였을 때 반도체영역의 저항값을 보였다. 또 Cu$_{x}$S를 도입할 경우 CuSO$_{4}$의 농도가 30g/l로, 3시간 반응시켰을 때 가장 만족스러운 전도도값을 나타냈다. 공중합체-Cu(II)보다 구리이온을 도입한 Cu$_{x}$S공중합체의 전도도값이 $10^{4}$정도로서 공중합체-Cu(II)보다 높은 전도성을 나타냈다.다.

• 한국기계가공학회지
• /
• 제11권6호
• /
• pp.169-174
• /
• 2012

Electromagnetic interference(EMI) shielding effectiveness(SE) was investigated in of woven fabric made of epoxy/copper-nickel fabrics and nickel coated carbon fiber reinforced acrylonitrile-butadiene-styrene(ABS) composites. The coaxial transmission line method was used to measure the EMI shielding effectiveness of the composites. We designed and constructed a measuring system, consisting of a network analyzer and a device that plays the serves as a sample holder and at the same time as a transmission medium of the incident electromagnetic wave. The measurement of SE were carried out frequency range from 100MHz to 2GHz. It is observed that the SE of the composits is the frequency dependent increase with the increase in nickel coated carbon fibre volume fraction. The nickel coating with 20wt% ABS composite was shown to exhibit up to 60dB of SE. The result that nickel coated carbon fibre ABS composite can be used for the purpose of EMI shielding as well as for some microwave applications.

• Elastomers and Composites
• /
• 제55권1호
• /
• pp.46-50
• /
• 2020

Material extrusion (ME)-type 3D printing is the most popular among the 3D printing processes. In this study, the cross-section morphologies of ME-type 3D printing manufactured specimens were observed with respect to the thermal properties of the material. The cross-section morphology of a specimen is related to the deposition strength, and the outside profile of the cross-section is related to the surface roughness. The filaments used in this study, with different thermal conductivities, were the acrylonitrile-butadiene-styrene (ABS), the high impact polystyrene (HIPS), the glycol-modified polyethylene terephthalate (PETG), and the polylactic acid (PLA). The cross-sections and the surfaces of the 3D manufactured specimens were examined. In ME-type 3D printing, the filaments are extruded through a nozzle and they form a layer. These layers rapidly solidify and as a result, they become a product. The thermal conductivity of the material influences the cooling and solidification of the layers, and subsequently the cross-section morphology and the surface roughness.

• 한국음향학회:학술대회논문집
• /
• 한국음향학회 2002년도 하계학술발표대회 논문집 제21권 1호
• /
• pp.377-380
• /
• 2002

Acoustic Characteristics of Nitrile Butadiene Rubber with Carbon Black ContentAcoustic and mechanical properties of Nitrile Butadiene Rubbers (NBR) with the variation of the carbon black content were investigated. NBR where the acrylonitrile content is $33\%$ based on the mole percent has been prepared with fixed sulfur content for vulcanization. Acoustic measurement of the prepared rubbers were peformed in the frequency region of $300\;\~\;1000\;kHz$. Their mechanical properties such as density, hardness were also measured. Increase of the carbon black content in the rubber resulted in enhancement of the mechanical property and linear increase of the sound speed as function of the carbon black content. Interestingly, attenuation of the sound speed was only affected by the existence of the carbon black and not by the amount of carbon black in the experiment range of this article. In this study, it was found that the amount of carbon black content in the NBR was correlated with the acoustic properties and can be estimated nondestructively by the measurement of the specific acoustic property.

• 한국신뢰성학회:학술대회논문집
• /
• 한국신뢰성학회 2006년도 학술발표대회 논문집
• /
• pp.48-54
• /
• 2006

In this thesis, accelerated life test (ALT) method and procedure for rubber O-ring are applied to assure specified reliability of the products at guaranteeing the life of the products. Rubber O-ring is parts that keep intensity or make machine operation smoothly on attrition portion of machine and is used to prevent that oil is leaked. Usually. Rubber O-ring used NBR that is copolymer of acrylonitrile and butadiene. this are superior oil resistance, heat resistance, durability of abrasion, cold resistance, chemical resistance etc. The accelerated life test model for rubber O-ring are developed using the relationship between stresses and life characteristics of products. Using the accelerated life test method and the acceleration life test equipment which is developed, we performed life test, collected life data and analyzed the results of tests. The proposed accelerated life test method and procedure may be extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably.

• Macromolecular Research
• /
• 제11권5호
• /
• pp.303-310
• /
• 2003

The phase behavior of binary blends of dimethylpolycarbonate-tetramethyl polycarbonate (DMPCTMPC) copolycarbonates and styrene-acrylonitrile (SAN) copolymers has been examined and then compared with that of DMPC/TMPC/SAN ternary blends having the same chemical components and compositions except that the DMPC and TMPC were present in the form of homopolymers. Both binary and ternary blends were miscible at certain blends compositions, and the miscible blends showed the LCST-type phase behavior or did not phase separated until thermal degradation temperature. The miscible region of binary blends is wider than that of the corresponding ternary blends. Furthermore, the phase-separation temperatures of miscible binary blends are higher than those of miscible ternary blends at the same chemical compositions. To explain the destabilization of polymer mixture with the increase of the number of component, interaction energies of binary pairs involved in these blends were calculated from the phase separation temperatures using lattice-fluid theory and then the phase stability conditions for the polymer mixture was analyzed with volume fluctuation thermodynamics.

• International Journal of Precision Engineering and Manufacturing
• /
• 제7권2호
• /
• pp.8-11
• /
• 2006

Gas-assisted injection molding (GAIM) process reduces the required injection pressure during mold filling stage as well as the shrinkage and warpage of the part and cycle time. Despite of these advantages, this process needs new parameters and makes the application more difficult because gas and melt interact during the injection molding process. Important GAIM factors involved in this process are gas penetration design, locations of gas injection points, shot size, delay time to inject gas as well as common injection molding parameters. In this study, the experiments are conducted to investigate effects of GAIM process variables on the gas penetration for PP (Polypropylene) and ABS (Acrylonitrile Butadiene Styrene) moldings by changing the gas injection point. Taguchi method is used for the design of the experiments. When the gas is injected at a cavity's center, the most effective factor is the shot size. When the gas is injected at a cavity's end, the most effective factor is the melt temperature. The injection speed is also an effective factor in GAIM process.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2004년도 춘계학술대회
• /
• pp.69-71
• /
• 2004

새로운 기술인 Momentary mold surface heating(MmSH)은 기존의 사출성형법으로 제조된 Acrylonitrile Butadiene Styrene(ABS)의 단점을 개선한 사출성형법이다. MmSH로 제조된 ABS와 기존의 사출성형법으로 제조된 ABS의 도금특성을 도금욕 pH 변화에 따라 연구하였다. Sodium hypophosphite가 첨가된 무전해 Ni 도금욕의 PH가 증가할수록 도금 두께가 증가하였고 기존의 사출성형법으로 제조된 ABS의 경우 pH 5이상에서 4B의 밀착력을 가졌다. MmSH로 제조된 ABS의 경우 pH 6이상에서 5B인 12.3N/25mm 이상의 가장 우수한 밀착력을 나타내었다.

• Korea-Australia Rheology Journal
• /
• 제17권4호
• /
• pp.165-170
• /
• 2005

In this study, high intensity ultrasound was employed to induce mechano-chemical degradation during melt mixing of polycarbonate (PC) and a series of styrene-acrylonitrile (SAN) copolymers. It was confirmed that generation of macroradicals of constituent polymers can lead to in-situ copolymer formation by their mutual combination, which should be an efficient path to compatibilize immiscible polymer blends and stabilize their phase morphology in the absence of other chemical agents. Based on the effectiveness of the compatibilization by ultrasound assisted mixing process, we investigated the effects of viscosity ratio of PC and SAN and AN content in SAN on the compatibilization of PC/SAN blends. It was found that effectiveness of compatibilization is optimal when the AN content is in the range of favorable interaction with PC and the viscosity of the matrix is higher than that of the dispersed phase. In addition, changes in the interfacial tension between PC and SAN were assessed by examining relaxation spectra which were obtained from measuring rheological properties of ultrasonically treated blends.