• Title/Summary/Keyword: High Strength Polyethylene

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Mechanical Properties of Wood-Fiber Thermoplastic Composites (목섬유(木纖維)와 열가소성(熱可塑性) 플라스틱 복합재료(複合材料)의 기계적(機械的) 성질(性質))

  • Park, Byung-Dae;Lim, Kie-Pyo;Kim, Yoon-Soo
    • Journal of the Korean Wood Science and Technology
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    • v.22 no.2
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    • pp.46-53
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    • 1994
  • This study was conducted to investigate a feasibility of manufacturing wood fiber thermoplastic composites and to evaluate their mechanical properties. Wood fiber as a potential reinforcing filler was compounded with two thermoplastics (polypropylene and high density polyethylene) in high intensity thermokinetic plastic mixer aided with a wetting agent. It was found that wood fiber thermoplastic composites could be manufactured by injection molding process. The tensile and flexural strength of injection molded specimens were improved greatly with increasing wood fiber concentration. Tensile and flexural modulus increased proportionately with wood fiber concentration. Wood fiber provided reinforcement with thermoplastics in terms of strength and modulus. However, the percent elongation at break and energy to break were reduced with increasing wood fiber loadings. Impact strength also showed similar trend.

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Effects of Draw Ratio and Additive CaCO3 Content on Properties of High-Performance PE Monofilament (연신비와 첨가제 CaCO3가 PE 모노필라멘트의 물성에 미치는 영향)

  • Park, Eun-Jeong;Kim, Il-Jin;Lee, Dong-Jin;Kim, Jung-Soo;Lee, Young-Hee
    • Fashion & Textile Research Journal
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    • v.23 no.2
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    • pp.290-296
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    • 2021
  • The effect of draw ratio (8, 10, 12, 14 times) and additive CaCO3 content (0, 0.5, 1.0, 1.5, 2.0, and 3.0 wt%) on the properties of high-performance PE monofilament was investigated in this study. As the draw ratio increased (8-14 times), the melting enthalpy (ΔHf), crystallinity, specific gravity, and tensile strength increased significantly. However, the draw ratio had little effect on the melting temperature (Tm) and crystallization temperature (Tc). The seawater fastness (stain and fade) of the hydrophobic PE monofilament prepared in this study showed an excellent grade of 4-5 in all draw ratios. To investigate the effect of the additive CaCO3 content on the properties of high-performance PE monofilament, the draw ratio was fixed at 14 times. It was found that the tensile strength of the PE monofilament sample containing 0.5 wt% of CaCO3 was much greater compared to the sample without CaCO3, but the elongation of the sample containing 0.5 wt% of CaCO3 was much less than the sample with 0 wt% CaCO3. However, in the case of the sample containing more than 0.5 wt% CaCO3, the tensile strength slightly decreased and the elongation slightly increased as the CaCO3 content increased. The seawater fastness (stain and fade) of the hydrophobic PE monofilament showed excellent grades of 4-5, regardless of the amount of additives. From the above results, it was found that the maximum draw ratio of 14 times with an additive of 0.5 wt% CaCO3 are the optimal conditions for manufacturing high-performance marine fusion materials with various fineness (denier) with high strength and low elongation.

Calcium Phosphate Cement Reinforced with Chopped High Performance Polyethylene Fiber.

  • Hirayama, S.;Ikemi, T.;Tsujimoto, Y.;Yamazaki, M.;Chow, L.C.;Takagi, S.;Antonucci, J.M.
    • Proceedings of the KACD Conference
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    • 2001.11a
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    • pp.567.1-567
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    • 2001
  • A self-setting calcium phosphate cement (CPC), consisting of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCP A), reacts with water and hardens fast (30 min) to form hydroxyapatite (HA) under physiological conditions as the final product. Although this CPC is finding increasing use as a biomaterial, it is presently limited to low stress bearing applications because of its relatively low strength and highly brittle nature. Recently the mechanical properties of CPC reinforced with chopped carbon fiber have been reported.

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Synthesis of Bluish-green Dyes for Pure Polyolefin Fibers (순수 폴리올레핀 소재용 청록색 염료의 합성)

  • Jo, Nayeong;Lee, Junheon;Kim, Taekyeong
    • Textile Coloration and Finishing
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    • v.28 no.3
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    • pp.156-163
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    • 2016
  • The 6 novel super hydrophobic bluish-green dyes, showing the maximum absorption at 600~650nm, were synthesized to dye polyolefin fibers such as polypropylene and high strength polyethylene fibers. Their absorption spectra appeared almost the same at visible range, which meant the length of alkyl substituents did not affect on color appearance of the dyes. The optimum length of alkyl group was determined as hexyl substituents from the practical point of view. From the dyeing results, the optimum dyeing condition was $130^{\circ}C$ for 1 hour. The good fastness ratings to washing, rubbing were obtained showing 4-5 for both fibers. Light fastness was obtained also good rating 4 for both fibers.

UV Treatment Technique for High Electrical Conductivity and Adhesion Strength of 3D Printed Circuit (3D 프린터로 제작된 회로의 전기전도성 및 접착강도 향상을 위한 UV 소결 기술)

  • Lee, Se-Hun;Gwon, O-Chang;Lee, Yu-Mi;Lee, Heon-Ju;Mun, Myeong-Un
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2015.11a
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    • pp.340-340
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    • 2015
  • 상지 절단 장애인들을 위한 미관형 의수는 95% 이상의 시장 보급률을 보인다. 하지만 외부 형상 향상에만 연구 초점이 맞추어져 있어 많은 장애인들이 의수를 착용할 때 차가운 표면으로 인해 이질감을 느낀다. 이로 인해 의수 제작 업체 및 절단 장애인들은 착용 시 이질감이 적은 의수의 보급을 희망하고 있다. 그러므로 본 연구에서는 인체와 유사한 온도를 발생시켜 이질감을 감소시키는 의수를 개발하기 위해 유연 기판인 TPU (Temperature Polyurethane)와 PET (Polyethylene terephthalate) 위에 상용 silver nano paste를 3D 프린터로 인쇄하였으며, UV 표면처리를 사용하여 단시간 내에 낮은 저항과, 높은 회로 접착강도를 갖는 회로를 개발 하였다.

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Statistical Analysis using Weibull Distribution on the Dielectric Breakdown Strength of High Density Polyethylene Films (HDPE필름 절연파괴강도의 Weibull분포에 의한 통계적 해석)

  • Kang, Moo-Sung;Kang, Dae-Yong;Park, Dae-Hee
    • Proceedings of the KIEE Conference
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    • 1997.07e
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    • pp.1702-1704
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    • 1997
  • 본 논문은 HDPE 필름의 절연성능을 평가하기 위하여 절연파괴강도의 결과를 Weibull분에 적용하였다. 각 절연파괴강도의 Weibull분포로부터 형의 모수를 구하였다. 또한 Weibull분포의 활용은 2개 및 3개의 모수법을 각각 적용시켜 절연파괴강도의 평가를 하였다. HDPE 필름을 열화시켜, 형의 모수변화를 비교하였다. 이와같은 Weibull분포의 활용은 절연성능과 수명의 평가를 통계적으로 평가코져 한다.

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Assessing Compressive Failure Characteristics of Hybrid Fiber Reinforced Cementitious Composites by Acoustic Emission (AE기법에 의한 하이브리드 섬유보강 시멘트복합체의 압축파괴특성 평가)

  • Kim, Sun-Woo;Ji, Sang-Kyu;Jeon, Su-Man;Yun, Hyun-Do
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.229-232
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    • 2006
  • The HPFRCCs show that the multiple crack propagation, high tensile strength and ductility due to the interfacial bonding of the fibers to the cement matrix. Moreover, performance of cement composites varies according to type and weight contents of reinforcing fiber. and HPFRCCs with hybrid fiber have better performance than HPFRCCs with single fiber in damage tolerance. Total four cylindrical specimens were tested, and the main variables were the type and weight contents of fiber, which was polyvinylalchol (PVA), polyethylene (PE). In order to clarify effect of hybrid types on the characteristics of fracture and damage process in cement composites, AE method was performed to detect micro-cracking in HPFRCCs under cyclic compression. Loading conditions of the uniaxial compression test were monotonic and cyclic loading. And from AE parameter value, it is found that the second and third compressive load cycles resulted in successive decrease of the amplitude as compared with the first compressive load cvcle.

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Effect of Polymeric Binders on Green body Properties of WC-Co Cemented Carbides (초경합금 성형체 특성 변화에 미치는 유기물 결합제의 영향)

  • Lim, Young-Soo;Ahn, Sun-Yong;Lim, Jae-Suk;Paek, Yeong-Kyeun;Chung, Tai-Joo
    • Journal of Powder Materials
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    • v.29 no.4
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    • pp.291-296
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    • 2022
  • The green body of WC-Co cemented carbides containing polymeric binders such as paraffin, polyethylene glycol (PEG), and polyvinyl acetate (PVA) are prepared. The green density of the WC-Co cemented carbides increases with the addition of binders, with the exception of PVA, which is known to be a polar polymeric substance. The green strength of the WC-Co cemented carbides improves with the addition of paraffin and a mixture of PEG400 and PEG4000. In contrast, the green strength of the WC-Co does not increase when PEG400 and PEG4000 is added individually. The compressive strength of the green body increases to 14 MPa, and the machinability of the green body improves when more than 4-6 wt% paraffin and a mixture of PEG400 and PEG4000 is used. Simultaneously, the sintered density of WC-Co is as high as 99% relative density, similar to a low binder addition of 1-2 wt%.

A Study on Characteristics of Flexural Behavior of High-strength Polymer Concrete Beams Using Recycled PET (PET 재활용 고강도 폴리머 콘크리트보의 휨거동에 관한 연구)

  • Cho Byung-Wan;Park Jong-Hwa;Park Seung-Kook;Bea Sung-Wan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.483-486
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    • 2005
  • The polymer concrete is drawing a strong interest as high-performance materials in the construction industry. Resins using recycled PET offer the possibility of a lower source cost of materials for making useful polymer concrete products. Also the recycling of PET in polymer concrete would help solve some of the solid waste problems posed by plastics and save energy. Polymer concrete beams using unsaturated polyester resins based on recycled polyethylene terephthalate (PET) plastic waste were used in our study for grasping its structural behavior of static and fatigue. As a result of static test, Compression stress distribution of Polymer concrete indicates linear behavior such as triangles. Although polymer concrete is high strength materials, its ductility capacity is excellent. From the fatigue test results, There was almost no difference on flexural characteristics between before and after fatigue loading. Therefore, recycled PET polymer concrete remains excellent structural ability after fatigue loading.

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A Study on Flammability and Mechanical Properties of HDPE/EPDM/Boron Carbide/Triphenyl Phosphate Blends with Compatibilizer (HDPE/EPDM/Boron Carbide/Triphenyl Phosphate 블렌드의 상용화제 첨가에 따른 난연성 및 기계적 물성 연구)

  • Shin, Bum-Sik;Jung, Seung-Tae;Jeun, Joon-Pyo;Kim, Hyun-Bin;Oh, Seung-Hwan;Kang, Phil-Hyun
    • Polymer(Korea)
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    • v.36 no.5
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    • pp.549-554
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    • 2012
  • It was known that triphenyl phosphate wasn't homogeneously dispersed in HDPE/EPDM/boron carbide blends, which caused the decrease in mechanical properties. HDPE, EPDM, boron carbide, and triphenyl phosphate were blended with PE-g-MAH(polyethylene-graft-maleic anhydride) as a compatiblizer for improving the miscibility of triphenyl phosphate. Tensile strength of HDPE/EPDM/boron carbide blends decreased with increasing the contents of triphenyl phosphate for flammability. However, the mechanical properties of HDPE/EPDM/boron carbide/triphenyl phosphate blends increased by the addition of compatiblizer because triphenyl phosphate was homogeneously mixed in the blend system. The homogeneous dispersibility of triphenyl phosphate was confirmed by using scanning electron microscopy (SEM). Increased thermal stability and flammability derived from high miscibility of triphenyl phosphate were confirmed by the results of thermogravimetric analysis (TGA) and limiting oxygen index (LOI). A self-extinguishing HDPE/EPDM/boron carbide/triphenyl phosphate blend was successfully fabricated with more than 21% LOI.