• Title/Summary/Keyword: Thermoplastic Composites

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Manufacturing and Mechanical Properties of Sisal Fiber Reinforced Hybrid Composites

  • Hui, Zhi-Peng;Sudhakara, P.;Wang, Yi-Qi;Kim, Byung-Sun;Song, Jung-Il
    • Composites Research
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    • v.26 no.5
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    • pp.273-278
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    • 2013
  • PLA/PP polymer blends in various ratios (PLA:PP = 9:1, 4:1, 3:1, and 1:1), and their composites (PLA:PP = 1:1) with sisal fiber (10, 15 and 20 wt%) were fabricated using MAPP as compatibilizer. The aim of the work was to reduce the cost of biodegradable composites as well as to improve the impact strength of PLA using PP, a relatively cheaper thermoplastic. The developed composites were characterized for their morphological and mechanical properties. The tensile strength and modulus of the blends were decreased with increasing PP content whereas the strain at break and impact strength are increased. The tensile strength, modulus and water absorption were increased for hybrid composites with increasing fiber content.

Evaluation of Impregnation and Mechanical Properties of Thermoplastic Composites with Different GF Content of GF/PP Commingled Fiber (유리섬유/폴리프로필렌 복합원사의 유리섬유 함량 변화에 따른 열가소성 복합재료의 함침 및 기계적 특성 평가)

  • Jang, Yeong-Jin;Kim, Neul-Sae-Rom;Kwon, Dong-Jun;Yang, Seong Baek;Yeum, Jeong Hyun
    • Composites Research
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    • v.33 no.6
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    • pp.346-352
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    • 2020
  • In mobility industries, the use of thermoplastic composites increased dynamically. In this study, the mechanical and impregnation properties of continuous glass fiber (GF)/polypropylene (PP) composite were evaluated with different GF contents. The GF/PP commingled fiber was manufactured with different GF contents and continuous GF/PP composite was manufactured using continuous compression molding process. Tensile, flexural, and impact test of specimens were evaluated with different GF contents. The fracture behavior of specimens was proved using field emission-scanning electron microscope images of fracture area and impregnation property was evaluated using dynamic mechanical analyzer and interlaminar shear strength. Finally, the GF/PP composite was the optimized mechanical and impregnation properties using 50 wt.% GF/PP commingled fiber.

A Study on the bending process of glass fiber reinforced thermoplastic composite (유리섬유 강화 열가소성 복합재료의 굽힘성에 대한 연구)

  • 남궁천;김동석;이중희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.513-517
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    • 1997
  • Glass fiber reinforced thermoplastic composite materials have considerable promise for increased use in low cost high volum applications because of the potential for processing by solid phase forming. However, the forming characteristics of these materials have not been well known. The primary focus of this research is the investigation of the bendability of these composites and spring-back phenomena in pure bending. The materials tested contained 10, 35, and 40 percent by weight of randomly oriented glass fiber in a polypropylene matrix. The bending tests were performed at temperatures ranging form 75 ".deg. c" to 150 ".deg. c" and at punch speeds of 2.54 mm/sec and 0.0254 mm/sec. The measured bendability and spring back angle in pure bending werw compared with the predictions based on the simple analyical models. Goog agreement between experimental and analytical results was observed.esults was observed.

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Dynamically Vulcanized PP/EPDM Blends:Effects of Different Types of Peroxides on the Properties

  • Naskar, K.;Noordermeer, J.W.M.
    • Elastomers and Composites
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    • v.38 no.2
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    • pp.167-174
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    • 2003
  • Thermoplastic vulcanizates (TPV) or dynamic vulcanizates are thermoplastic elastomers produced by simultaneous mixing and crosslinking of a rubber and a thermoplastic. The objective of the present work is to investigate the effects of different types of peroxides as curing agents on the properties of PP/EPDM TPVs. The mechanical properties change significantly with the chemical nature of the peroxides and the extent of crosslinking at a fixed PP/EPDM blend ratio. The tensile strength of the TPVs obtained with the various peroxides can be related to the solubility parameters of the polymers and of the peroxides. The Young's modulus of the peroxide-cured TPVs can be correlated with the delta torque values of equivalent thermoset EPDM vulcanizates, corresponding to the crosslinking efficiencies of the peroxides.

The Behavior of Mechanical property of Thermoplastic Composite in Compression Molding (복합재료의 압축성형에 따른 기계적 특성변화)

  • 이중희;이호언
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.11a
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    • pp.261-264
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    • 2000
  • The objective of this work was to characterize mechanical properties of thermoplastic composites for various forming condition in compression molding. Randomly oriented long glass fiber reinforced polypropylene(PP) was used in the work. The composite materials contained 20%, 30%, and 40% glass fiber by weight. Compression molding was conducted to make the test specimen. Dimensional stability was measured on each forming condition with the spring-forward angle. Tensile test was conducted to characterize mechanical properties of formed parts in various forming conditions.

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Structural Simulation of Wrist Band for Wearable Device According to Design and Material Model

  • Kwon, Soon Yong;Cho, Jung Hwan;Yoo, Jin;Cho, Chul Jin;Cho, Sung Hwan;Woo, In Young;Lyu, Min-Young
    • Elastomers and Composites
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    • v.53 no.4
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    • pp.226-233
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    • 2018
  • Elastomers based on the thermoplastics are widely used in rubber industries. Thermoplastic elastomers have the advantages of an easy shaping process and elimination of recycling problems. Thermoplastic polyester elastomer (TPE) is used for making rubber bands in wearable devices and its applications are increasing. In this study, five wrist bands were designed and their mechanical behaviors were examined by computer simulation, using hyper elastic models, Mooney-Rivlin and Ogden models, and a linear elastic model. Simulation results were compared and discussed in terms of band design and material model.

A study on structure and separation orientation of fiber-reinforced thermoplastic sheet (섬유강화 플라스틱 복합판의 구조와 분리.배향에 관한 연구)

  • Lee, Dong-Gi;Cho, Kwang-Hyun
    • Journal of the Korean Society for Precision Engineering
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    • v.10 no.2
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    • pp.104-113
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    • 1993
  • Characteristics of fiber-reinforced thermoplastic sheet depend on the quantity and shape of fibers. During a molding process of composites, the fiber-maxtrix separation and fober orientation are caused by the flow during the molding process. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation-orientation and molding conditions. The correlation between the separation and the orientation have to be clarified for designing the fiber structure. In this paper, the degree of nonhomogeneity which is a measure of the separation is obtained using one-dimensional rectangular shaped part compression molding. And the orientation function is defined and measured by the image processing using soft X-rayed photograph and image scammer. Correlation between the degree of nonhomogeneity and the orientation function is discussed.

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Conductive Properties of Thermoplastic Carbon Fiber Reinforced Plastics Highly Filled with Carbon Fiber Fabrics and Conductive Carbon Fillers (탄소섬유 직물 및 전도성 탄소 필러가 고충진 된 열가소성 탄소섬유강화플라스틱의 전도 특성)

  • Kim, Seong Yun;Noh, Ye Ji;Jang, Ji-un;Choi, Seong Kyu
    • Composites Research
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    • v.34 no.5
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    • pp.290-295
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    • 2021
  • The application of lightweight structural composites to automobiles as a solution in line with global fuel economy regulations to curb global warming is recognized as a megatrend. This study was conducted to provide a technical approach that can respond to the issue of replacing parts that require conductive properties to maximize the application of thermoplastic carbon fiber reinforced plastics (CFRPs), which are advantageous in terms of repair, disposal and recycling. By utilizing the properties of the low-viscosity polymerizable oligomer matrix, it was possible to prepare a thermoplastic CFRP exhibiting excellent impregnation properties while uniformly mixing the conductive filler. Various carbon-based conductive fillers such as carbon black, carbon nanotubes, graphene nanoplatelets, graphite, and pitch-based carbon fibers were filled up to the maximum content, and electrical and thermal conductive properties of the fabricated composites were compared and studied. It was confirmed that the maximum incorporation of filler was the most important factor to control the conductive properties of the composites rather than the type or shape of the conductive carbon filler. Experimental results were observed in which it might be advantageous to apply a one-dimensional conductive carbon filler to improve electrical conductivity, whereas it might be advantageous to apply a two-dimensional conductive carbon filler to improve thermal conductivity. The results of this study can provide potential insight into the optimization of structural design for controlling the conductive properties of thermoplastic CFRPs.