• Title, Summary, Keyword: 섬유강화 고분자 복합재

Search Result 28, Processing Time 0.034 seconds

Studies on Surface Free Energy and Tear Properties of Surface-Modified Silicas/LDPE Composites (표면처리된 실리카/LDPE 복합재료의 표면 자유에너지 변화 및 인열물성에 관한 연구)

  • 정우영;박병기;박수진
    • Proceedings of the Korean Fiber Society Conference
    • /
    • /
    • pp.330-333
    • /
    • 2001
  • 일반적으로 하나 또는 그 이상의 입자상 충전재 흑은 섬유상 강화재와 연속상인 고분자 기재로 이루어진 고분자 복합재료는 물성이나 기능이 더욱 더 우수한 고성능/고기능성 고분자 재료에 대한 수요가 급격히 증대됨에 따라 이에 대한 많은 연구가 행해지고 있다[1,2]. 그러나 고분자 복합재료의 응력전달은 강화재와 고분자 기재의 계면을 통하여 일어나게 되므로 복합재료의 기계적 물성 등은 충전재의 양, 입자의 크기, 표면성질 뿐만 아니라 강화재와 고분자 기재 사이의 계면 접착력 또는 계면 성질에 크게 좌우된다. (중략)

  • PDF

Behavior of Fiber-Reinforced Smart Soft Composite Actuators According to Material Composition (섬유 강화 지능형 연성 복합재 구동기의 재료구성에 따른 거동특성 평가)

  • Han, Min-Woo;Kim, Hyung-Il;Song, Sung-Hyuk;Ahn, Sung-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.41 no.2
    • /
    • pp.81-85
    • /
    • 2017
  • Fiber-reinforced polymer composites, which are made by combining a continuous fiber that acts as reinforcement and a homogeneous polymeric material that acts as a host, are engineering materials with high strength and stiffness and a lightweight structure. In this study, a shape memory alloy(SMA) reinforced composite actuator is presented. This actuator is used to generate large deformations in single lightweight structures and can be used in applications requiring a high degree of adaptability to various external conditions. The proposed actuator consists of numerous individual laminas of the glass-fiber fabric that are embedded in a polymeric matrix. To characterize its deformation behavior, the composition of the actuator was changed by changing the matrix material and the number of the glass-fiber fabric layers. In addition, current of various magnitudes were applied to each actuator to study the effect of the heating of SMA wires on applying current.

Structural Changes of Nylon 6/Clay Nanocomposite Film on Drawing Condition (Nylon 6/Clay 나노복합재 필름의 연신조건에 따른 구조적 변화)

  • 강영아;김경효;이양헌;조현혹
    • Proceedings of the Korean Fiber Society Conference
    • /
    • /
    • pp.352-353
    • /
    • 2003
  • Clay 분산 유/무기 나노복합재 제조기술은 실리케이트 층상구조의 점토광물을 나노 스케일의 시트상의 기본 단위로 박리(exfoliation)하여 고분자수지에 분산시킴으로써 범용 고분자의 낮은 기계적 물성의 한계를 엔지니어링 플라스틱 수준으로까지 올리고자 하는 것으로서, 기존의 무기 충진재 및 강화재의 입자크기(〉1 $\mu\textrm{m}$)를 나노 스케일까지 분산시켜 기존 무기물 충진 복합재의 단점을 한층 보완하는 것을 목표로 하고 있어 성능 및 원가 면에서 매우 유리한 방법으로 21세기의 복합재료 생산시장의 판도에 상당한 변화를 가져오게 할 수 있는 핵심기술이라 할 수 있다. (중략)

  • PDF

Errects of the Length of Carbon Fiber on the Wear Properties of Carbon/Carbon Composites (탄소/탄소 복합재료의 마모특성에 대한 탄소섬유 길이의 영향)

  • Ha, Hun-Seung;Kim, Dong-Kyu;Park, In-Seo;Im, Yeon-Su;Yun, Byung-Il
    • Korean Journal of Materials Research
    • /
    • v.3 no.3
    • /
    • pp.292-299
    • /
    • 1993
  • In this paper the effects of the length of carbon fiber on the wear properties of carboni carbon composites were investigated. Carbon/carbon composites were fabricated by the liquid impregnation method using the resol-type phenolic resin as a matrix precursor and PAN-based, non-surface treated carbon fiber as a reinforcement. The measured values of the friction coefficient of carbon/carbon composites against AlSl 304 stainless steel ranged from 0.2 to 0.3 under the operating condition used in this study. The effect of the length of carbon fiber on the friction coefficient of carbon/carbon composites were not found. But, it was realized that the wear rate of carbon/carbon composites tends to increase, as the length of carbon fiber increases.

  • PDF

Measurement of the Fiber Orientation on Weld-Line Parts for Injection Molding of Fiber Reinforced Polymeric Composites (섬유강화 고분자 복합재의 사출성형에 있어서 웰드라인부의 섬유배향측정)

  • Kim, H.;Kang, M.G.;Choi, Y.S.;Lee, D.G.;Han, G.Y.;Kim, E.G.
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • /
    • pp.265-270
    • /
    • 2000
  • Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation· orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line parts in injection-molded products is assessed. And the effects of fiber content and injection molding conditions on the fiber orientation functions are also discussed

  • PDF

Influence of Sizing Agent on Interfacial Adhesion and Mechanical Properties of Glass Fiber-reinforced Plastics

  • 김택진;박수진;이재락;김영근
    • Proceedings of the Korean Society For Composite Materials Conference
    • /
    • /
    • pp.44-48
    • /
    • 1999
  • 섬유 강화 고분자 복합재료에서 강화재인 섬유와 매트릭스의 계면은 복합재료의 물성에 지대한 영향을 미친다. 섬유와 매트릭스의 물성 차이 즉, 탄성율, 열팽창 계수, 경화시의 수축, 결정화도 등의 차이뿐만 아니라 하중이 가해질 때 응력 집중 (stress concentration) 현상이 계면에서 일어난다[1]. 유리섬유를 강화재로 사용한 복합재료에서 유리섬유는 표면이 hydroxyl기로 덮여 있기 때문에 친수성이 매우 크고 또한 마찰이나 정전기에 의해 손상을 받기 쉬운 단점이 있다. 따라서 매트릭스 수지와의 계면 접착력을 향상시키고 제조 공정 중에 섬유를 마찰이나 정전기로부터 보호하기 위한 처리가 필요하며 이들 "sizing" 이라고 한다[2,3].고 한다[2,3].

  • PDF

Study on Mechanical and Electrical Properties of Expanded Graphite/Carbon fiber hybrid Conductive Polymer Composites (팽창흑연/탄소섬유 혼합 보강 전도성 고분자 복합재료의 특성 평가)

  • Oh, Kyung-Seok;Heo, Seong-Il;Yun, Jin-Chul;Han, Kyung-Seop
    • Composites Research
    • /
    • v.20 no.6
    • /
    • pp.1-7
    • /
    • 2007
  • Expanded graphite/carbon fiber hybrid conductive polymer composites were fabricated by the preform molding technique. The conductive fillers were mechanically mixed with a phenol resin to provide an electrical property to composites. The conductive filler loading was fixed at 60wt.% to accomplish a high electrical conductivity. Expanded graphites were excellent in forming a conductive networking by direct contacts between them while it was hard to get the high flexural strength over 40MPa with using only expanded graphite and phenol resin. In this study, carbon fibers were added in composites to compensate the weakened flexural strength. The effect of carbon fibers on the mechanical and electrical properties was examined according to the weight ratio of carbon fiber. As the carbon fiber ratio increased, the flexural strength increased until the carbon fiber ratio of 24wt.%, and then decreased afterward. The electrical conductivity gradually decreased as the increase of the carbon fiber ratio. This was attributed to the non-conducting regions generated among the carbon fibers and the reduction of the direct contact areas between expanded graphites.

Characterization for Viscoelasticity of Glass Fiber Reinforced Epoxy Composite and Application to Thermal Warpage Analysis in Printed Circuit Board (유리섬유강화 복합재의 점탄성 특성 규명 및 인쇄회로기판 열변형해석에의 적용)

  • Song, Woo-Jin;Ku, Tae-Wan;Kang, Beom-Soo;Kim, Jeong
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.2
    • /
    • pp.245-253
    • /
    • 2010
  • The reliability problems of flip chip packages subjected to temperature change during the packaging process mainly occur due to mismatches in the coefficients of thermal expansion as well as features with time-dependent material properties. Resin molding compounds like glass fiber reinforced epoxy composites used as the dielectric layer in printed circuit boards (PCB) strongly exhibit viscoelastic behavior, which causes their Young's moduli to not only be temperature-dependent but also time-dependent. In this study, the stress relaxation and creep tests were used to characterize the viscoelastic properties of the glass fiber reinforced epoxy composite. Using the viscoelastic properties, finite element analysis (FEA) was employed to simulate thermal loading in the pre-baking process and predict thermal warpage. Furthermore, the effect of viscoelastic features for the major polymeric material on the dielectric layer in the PCB (the glass fiber reinforced epoxy composite) was investigated using FEA.

3D Printable Composite Materials: A Review and Prospective (3D 프린터용 복합재료 연구 동향)

  • Oh, Eunyoung;Lee, Jinwoo;Suhr, Jonghwan
    • Composites Research
    • /
    • v.31 no.5
    • /
    • pp.192-201
    • /
    • 2018
  • The use of 3D printing for rapid tooling and manufacturing has promised to produce components with complex geometries according to computer designs and it is emerging as the next generation key of manufacturing. Due to the intrinsically limited mechanical/electrical properties and functionalities of printed pure polymer parts, there is a critical need to develop 3D printable polymer composites with high performance. This article gives a review on 3D printing techniques of polymer composite materials and the properties and performance of 3D printed composite parts as well as their potential applications in the various fields.

Study of Mechanism for Improving Tensile Elastic Modulus of Self-reinforced Composite (친환경 저비중 자기보강 복합소재 개발을 위한 공정 변수별 영향도 평가)

  • Yun, Deok Woo;Kang, Hyun Min
    • Composites Research
    • /
    • v.28 no.4
    • /
    • pp.197-203
    • /
    • 2015
  • Tensile properties of polypropylene based self-reinforced composites were investigated as a function of process variables of the double-belt lamination equipment such as pressure, temperature and cooling conditions. Elastic modulus was enhanced approximately 6 times from 0.2 to 1.2 GPa. The improvement mechanism was studied by identification of crystalline structure changes using DSC and XRD analysis. In addition, morphology change of self-reinforced composites was also investigated by SEM analysis in order to reveal the degree of impregnation.