• Title, Summary, Keyword: Bismaleimide (BMI)

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Interfacial Evaluation and Microfailure Mechanisms of Carbon Fiber/Bismaleimide (BMI) Composites using Tensile/compressive Fragmentation Tests and Acoustic Emission (인장/압축 Fragmentation 시험법과 음향방출을 이용한 Carbon Fiber/Bismaleimide (BMI) Composites 의 계면 평가와 미세파괴 메커니즘 연구)

  • 김진원;박종만;윤동진
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.79-83
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    • 2000
  • Interfacial and microfailure properties of carbon liber/bismaleimide (BMI) composites were evaluated using both tensile fragmentation and compressive Broutman tests with acoustic emission (AE). Since BMI is rather difficult matrix to apply for the conventional fragmentation test because of its too low elongation and too brittle and high modulus properties, dual matrix composite system was applied. After carbon fiber/BMI composite was prepared for rod shape by controlling differing curing stage, composites rod was embedded in toughened epoxy as outer matrix. The typical microfailure modes including fiber break, matrix cracking, and interlayer failure were observed during tensile testing, whereas the diagonal slippage in fiber ends was observed during compressive test. On the other hand, AE amplitudes of BMI matrix fracture were higher than carbon fiber tincture under tensile test because BMI matrix has very brittle and high modulus. The waveform of signals coming from BMI matrix fractures was consistent with AE amplitude result under tensile tests.

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Thermal Properties and Water Sorption Behaviors of Epoxy and Bismaleimide Composites

  • Seo, Jong-Chul;Jang, Won-Bong;Han, Hak-Soo
    • Macromolecular Research
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    • v.15 no.1
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    • pp.10-16
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    • 2007
  • In this work, we prepared epoxy/BMI composites by using N,N'-bismaleimide-4,4'-diphenylmethane (BMI), epoxy resin (diglycidyl ether of bisphenol-A (DGEBA)), and 4,4'-diamino diphenyl methane (DDM). The thermal properties and water sorption behaviors of the epoxy and BMI composites were investigated. For the epoxy/BMI composites, the glass transition and decomposition temperatures both increased with increasing BMI addition, which indicates the effect of BMI addition on improved thermal stability. The water sorption behaviors were gravi-metrically measured as a function of humidity, temperature, and composition. The diffusion coefficient and water uptake decreased and the activation energy for water diffusion increased with increasing BMI content, indicating that the water sorption in epoxy resin, which causes reliability problems in electronic devices, can be diminished by BMI addition. The water sorption behaviors in the epoxy/BMI composites were interpreted in terms of their chemical and morphological structures.

Fluorescence Characterization of LaRC PETI-5, BMI, and LaRC PETI-5/BMI Blends

  • Cho, Donghwan;Yang, Gyeongmo
    • Fibers and Polymers
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    • v.3 no.2
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    • pp.60-67
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    • 2002
  • In the present study, the fluorescence behavior ova phenylethynyl-terminated imide (LaRC PETI-5) resin, a bismaleimide (BMI) resin, and various LaRC PETI-5/BMI blends with different blend compositions has been characterized as a function of heat-treatment temperature, using a steady-state fluorescence technique with a front-face illumination method far solid-state films. It is observed that there are distinguishable changes in the spectral shape, size, and position of fluorescence with varying heat-treatment temperature in the pure and blend samples. The result is qualitatively explained in terms of charge transfer complex formation as well as microenvironmental change with local mobility and viscosity occurring in the LaRC PETI-5, BMI, and their blends during the cure process. The result also implies that a steady-state fluorescence technique may be a useful tool to understand the processing conditions of polyimides and their blends in the film form on the basis of their thermo-photophysical responses.

Shear Behavior of $Carbon/BMI({\pm}45^{\circ})_{2s}$By Acoustic Emission (음향방출을 통한 $Carbon/BMI({\pm}45^{\circ})_{2s}$의 전단 거동)

  • Lee, Taek-Su;Lee, Jong-Mun;Lee, Jae-Rak
    • Korean Journal of Materials Research
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    • v.4 no.8
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    • pp.888-894
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    • 1994
  • In detail of fracture and mechanical properties to carbon/BMI$(\pm 45^\circ)_{2s}$ discusses by acoustic emission and tensile testing. The bismaleimide resin from Boots Technochemie Co. was toughened by TM 120 from same Co. The weight proportions of TM 120 were fixed as 0, 5, 10, 15, 20, 25phr. The 0.2phr of 1, 4-diazobicyclo-(2, 2, 2)-octane(DABC0) was used as the accelerator. The used carbon fiber was T300 from Toray Co. The optimum additional proportion of TM120 was proved as 20phr by mechanical testing and at the same time by the results of acoustic emission. toughening agent gives significant influences on the fracture phenomena and mechanical strength.

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Fabriation of BMI Resin Composite for High Speed Train Transformer (변압기 권선 지지용 BMI 수지 복합재 제조 공정 개발)

  • 엄문광;김종훈;우재희;김세창
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.257-260
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    • 2000
  • The composite composed of glass fabric and BMI resin was fabricated using resin transfer molding(RTM) process. it will be used as a supporting plate of transformer coil for high speed train. To develop a RTM process, permeability of preform was measured and resin properties like a viscosity and gellation time were checked. A resin pre-heating system and a mold system were also designed and developed. Using a vacuum-assisted RTM process, the composite supporting plate was successfully fabricated.

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Effect of Catalyst and Reactive Toughening Aid on the Fractography of Carbon/BMI ($\pm$45。)2s Matrix (촉매와 반응성 내충격성 증진제의 Carbon/BMI ($\pm$45。)2s 매트릭스의 파단특성에 영향)

  • 김준형
    • The Korean Journal of Rheology
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    • v.3 no.1
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    • pp.30-37
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    • 1991
  • 제 2세대 bismaleimide의 일종인 Boots Technochemie 사의 Compimide 800을 매트 릭스 수지로 선정하여 여기에 촉매(DABCO 0.2wt%) 및 반응성 내충격성 증진제(TM 120; 15. 30, 60 part)를 첨가하여 Carbon/BMI 적층판($\pm$ 45。)2s를 만들어 인장 시험을 하여 in-plane shear하에서의 파단특성을 조사하였다, 이경우에 전단 탄성율을 망목상구조의 특성 에 의해 좌우되고 전단강도는 파단면의 형태와 밀접합 관계가 있다. TM 120을 30 part 첨 가한 경우의 전단강도가 가장 우수하였다

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New Hyperbranched Polyimides and Polyamides: Synthesis, Chain-End Functionalizations, Curing Studies, and Some Physical Properties (새로운 Hyperbranchedpolyimidesandpolyamides: 합성, 말단기 변형, 경화 연구, 그리고 물리적 성질)

  • Baek, Jong-Beom;Chris B. Lyon;Tan, Loon-Seng
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.1-2
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    • 2003
  • While aromatic polyimides and polyamides have found widespread use as high performance polymers, the present work addressed the need for organosoluble materials through the use of a hyperbranching scheme. The $AB_2$ monomers were prepared. The $AB_2$ monomers were then polymerized via aromatic fluoride-displacement and Yamazaki reactions to afford the corresponding hydroxyl-terminated hyperbranched polyimides (HT-PAEKI) and amine-terminated hyperbranched polyamides, respectively. HT-FAEKI was then functionalized with allyl and propargyl bromides as well as epichlorohydrin to afford allyl-terminated AT-PAEKI, propargyl-terminated PT-PAEKI, and epoxy (glycidyl)-terminated ET-PAEKI, in that order. All hyperbranched poly(ether-ketone-imide)s were soluble in common organic solvents. AT-PAEKI was blended with a bisphenol-A-based bismaleimide (BFA-BMI) in various weight ratios. Thermal, rheological, and mechanical properties of these blend systems were evaluated. Two characteristic hyperbranched polyamides, which the one has para-electron donating groups to the surface amine groups and the other has para-electron withdrawing groups to the surface amine groups, were selected to compare BMI curing behaviors. The electron rich polymer displayed ordinary Michael addition type exothermic reaction, while electron deficient polymer did display unusual curing behaviors. Based on analytical data, the later system provided the strong evidences to support room temperature curing of BMI by reactive intermediates instead of reactive primary amine groups on the macromolecule surface.

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Phenylethynyl-terminated polyimide, exfoliated graphite nanoplatelets, and the composites: an overview

  • Cho, Donghwan;Drzal, Lawrence T.
    • Carbon letters
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    • v.19
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    • pp.1-11
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    • 2016
  • In efforts to characterize and understand the properties and processing of phenylethynyl-terminated imide (LaRC PETI-5, simply referred to as PETI-5) oligomers and polymers as a high-temperature sizing material for carbon fiber-reinforced polymer matrix composites, PETI-5 imidization and thermal curing behaviors have been extensively investigated based on the phenylethynyl end-group reaction. These studies are reviewed here. In addition, the use of PETI-5 to enhance interfacial adhesion between carbon fibers and a bismaleimide (BMI) matrix, as well as the dynamic mechanical properties of carbon/BMI composites, are discussed. Reports on the thermal expansion behavior of intercalated graphite flake, and the effects of exfoliated graphite nanoplatelets (xGnP) on the properties of PETI-5 matrix composites are also reviewed. The dynamic mechanical and thermal properties and the electrical resistivity of xGnP/PETI-5 composites are characterized. The effect of liquid rubber amine-terminated poly(butadiene-co-acrylonitrile) (ATBN)-coated xGnP particles incorporated into epoxy resin on the toughness of xGnP/epoxy composites is examined in terms of its impact on Izod strength. This paper provides an extensive overview from fundamental studies on PETI-5 and xGnP, as well as applied studies on relevant composite materials.

A Study on the Performance Test and Manufacture of the Dielectric Sensor for the Cure Monitoring of the High Temperature Composites (고온 복합재료의 경화 모니터링을 위한 고온 유전센서의 제작 및 성능평가에 관한 연구)

  • 김일영;최진호;이대길
    • Composites Research
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    • v.14 no.1
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    • pp.30-38
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    • 2001
  • As fiber reinforced composite materials are widely used in aircraft, space structures and robot arms, the on-line cure monitoring during the cure process of the composite materials has become an important research area for the better quality and productivity. In this paper, the dielectric circuit of the Wheatstone bridge type for measuring the dissipation factor during cure of thermsetting resin matrix composite materials was designed and manufactured. Also, the dielectric sensor for the cure monitoring of high temperature cure composites was developed and tested. The residual thermal stresses of the dielectric sensor during high temperature cure were analyzed by the finite element method and its dielectric characteristics at high temperature cure were analyzed by the finite element method and its dielectric characteristics at high temperature were evaluated. The on-line cure monitoring of the BMI(Bismaleimide) resin was performed using the developed Wheatstone bridge type circuit and the high-temperature dielectric sensor.

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