• Title, Summary, Keyword: polypropylene

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The Graft Reaction of Polypropylene with Maleic Anhydride and Its Dyeability (무수말레산 그라프트 폴리프로필렌과 그의 염색성)

  • Hong, Seong-Il;Lee, Taek-Seung;Lee, Nam-Gwan
    • Textile Science and Engineering
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    • v.27 no.7
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    • pp.71-81
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    • 1990
  • Polypropylene was reacted with maleic anhydride to improve the dyeability. The modified polypropylene was characterized by T-lR, SEM, and elemental analysis. This maleic anhydride reacted polypropylene showed a good dyeability with basic dye and disperse dye. The crystallinity of modified polypropylene was decreased with increasing the maleic anhydride content reacted onto polypropylene. The inherent viscosity of modified polypropylene was decreased because the chain scission occurred during the reaction. Blends of Polypropylene and modified Polypropylene with energy quencher were dyed excellently with disperse dyes, while those without energy quencher were dyed excellently with basic dyes. Blends of Polypropylene and modified Polypropylene mixed with energy Quencher show a lower crystallinity than those mixed without energy quencher.

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Rheological Characterization of Polypropylene/Layered Silicate Nanocomposites Using Integral Constitutive Equations (적분형 구성방정식을 이용한 폴리프로필렌/층상 실리케이트 나노복합재료의 유변학적 특성 분석)

  • Lee, Seung-Hwan;Youn, Jae-Ryoun
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.137-140
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    • 2005
  • Exfoliated nanocomposites of polypropylene/layered silicate were prepared by a melt compounding process using maleic anhydride modified polypropylene (PP-g-MAH) and organoclay. It was found that polypropylene/layered silicate nanocomposites exhibited remarkable reinforcement compared with the pure polypropylene or conventional composite filled with agglomerated organoclay. The polypropylene /layered silicate nanocomposites showed stronger and earlier shear thinning behaviors and outstanding strain hardening behavior than pure polypropylene or other conventional composites in shear and uniaxial elongational flows, respectively. We simulated rheological modeling for the pure polymer matrix and polypropylene/layered silicate nanocomposite in shear and elongational flows using K-BKZ integral constitutive equation. The two types of K-BKZequations have been examined to describe experimental results of shear and uniaxial elongational viscosities of pure polypropylene and polypropylene/layered silicate nanocomposite.

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Studies on Composites Using Wood and Nonwood Fibers - Effects of Polypropylene Fiber Length and Process Variables - (목질(木質)과 비목질계(非木質系) 섬유(纖維)를 활용한 복합재(複合材) 연구(硏究) - 폴리프로필렌의 섬유장(纖維長)과 공정변수(工程變數)의 영향(影響)을 중심(中心)으로 -)

  • Lee, Phil-Woo
    • Journal of the Korean Wood Science and Technology
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    • v.25 no.2
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    • pp.33-44
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    • 1997
  • This study was executed to examine the effects of polypropylene fiber length and process variables of the composites made from wood fiber and nonwood fiber mixed formulations. As a nonwood fiber the polypropylene with 3 denier thickness of tow condition was selected and cut into each length of 0.5, 1.0, 1.5, 2.0 and 2.5cm to mix with wood fiber. And also western hemlock wood fiber for medium density fiberboard was prepared. First, to decide an adequate polypropylene mixing fiber length, the composites of 1.0g/$cm^3$ density were made from 10% polypropylene fiber by each of five lengths and 90% western hemlock fiber mixed formulations. Thereafter as the experiments of process variable, the composites applied with adequate polypropylene fiber length(1.5cm) were made from 4 density levels (0.6, 0.8, 1.0, 1.2g/$cm^3$). 3 mixed formulations of wood fiber to polypropylene fiber(95 : 5, 90 : 10, 85 : 15), and 3 mat moisture contents(5, 10, 20%). According to the results and discussions it was concluded as follows ; The physical and mechanical properties were shown improved tendency. as polypropylene fiber length was increased in the range from 0.5 to 1.5cm, but shown decreasing tendency from 2.0 to 2.5 cm. Accordingly, it was shown that polypropylene fiber length is limited to 1.5cm or less length in mixing wood fiber and polypropylene fiber by turbulent air mixing process. As the densities of wood fiber-polypropylene fiber composites were increased, the physical and mechanical properties were clearly improved. Also they were shown significantly increasement statistically between densities respectively. In the mixed formulations, physical and mechanical properties were shown only slightly improvement, as they changed from 95 : 5 to 85 : 15 in wood fiber to polypropylene fiber. Despite of increasement of mat moisture content, mechanical properties were not improved significantly but physical properties were improved somewhat in wood fiber-polypropylene fiber composites.

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Formation of Polypropylene Thin Films with Superhydrophobic Surface (초소수성 표면특성을 갖는 폴리프로필렌 박막형성)

  • Park, Jae Nam;Shin, Young Sik;Lee, Won Gyu
    • Applied Chemistry for Engineering
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    • v.25 no.6
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    • pp.598-601
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    • 2014
  • The effects of process parameters for the formation of polypropylene film such as the polypropylene concentration in the solution, drying temperature for coating film, and variation of nano-silica content on the surface structure and property of polypropylene film have been studied. A super-hydrophobic polypropylene film with a maximum contact angle of $154^{\circ}$ was obtained at the condition of a polypropylene concentration of 30 mg/mL, a drying temperature of $30^{\circ}C$, a drying pressure of 93 mtorr for 90 min. The increase of a drying temperature reduced the contact angle by enhancing the surface smoothness of the film. The increase of nano-silica content in the composite film composed of polypropylene and silica changed the surface shape from microporous to microglobular, which led to increasing the contact angle and showed the super-hydrophobic surface property.

A Study on the Mechanical Properties and Color Fastness of Polypropylene Knit (폴리프로필렌 편성물의 역학적 성능과 염색견뢰도에 관한 연구)

  • Kwon, Myoung-Sook
    • Journal of the Korean Society of Costume
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    • v.58 no.1
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    • pp.1-8
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    • 2008
  • The purpose of this study was to investigate the mechanical properties and hand values of polypropylene knit and to analyze its color-fastness for light, laundering and abrasion, comparing to nylon and polyester knits. The results of this study were as follows: 1. Polypropylene stretched more with less force than nylon and polyester and its elastic recovery and shape stability were better than nylon and polyester. 2. Polypropylene was more flexible than nylon and polyester. 3. Polypropylene stretched more easily for shearing but its recovery from shearing was less than nylon and polyester. 4. Polyester had smoother surface than nylon and polyester. 5. Polypropylene was compressed more easily than polyester with less force but less than nylon. Its recovery from compression was more than nylon and polyester. 6. Polypropylene had lower KOSHI and SHARI values and higher FUKURAMI value than nylon and polyester. It had better T.H.V. value than nylon but less than! polyester. 7. Color fastness of polypropylene for lanudering, light, and abrasion in wet and dry conditions was good except polypropylene dyed with red color.

Physical Properties of Polypropylene Blended Yarns with Yarn Counts and Blended Ratio (Polypropylene 복합방적사의 섬도와 혼용율에 따른 물성)

  • Kim, Jeong-Hwa;Lee, Jung-soon
    • Fashion & Textile Research Journal
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    • v.20 no.5
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    • pp.600-607
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    • 2018
  • Polypropylene fibers, while having many advantages such as light weight, sweat fast drying, water-repellent, drainage, thermal insulation, anti-static property has a drawback in dyeing. In recent years, the development of dyeable polypropylene fibers has expanded its value in the textile market. The purpose of this study is to fabricate composite spun yarns using polypropylene, acrylic, rayon and wool and to analyze tensile properties, uniformity characteristics, bending properties, hairiness, and surface shape according to the degree of fineness and blended ratio. The specimens consisted of 100% polypropylene spun yarn pp30, pp40 and ppa(pp/acrylic), ppr(pp/rayon), ppw(pp/wool), 5 altogether sed in this study. The results of the study are as follows. The breaking strength of polypropylene spun yarn blended with rayon and acrylic was higher than that of 100% polypropylene spun yarn. The polypropylene spun yarn is higher the fineness been shown to decrease the breaking strength and elongation. The bending properties of polypropylene spun yarns were in the order of ppa>ppr>pp40>pp30>ppw. The unevenness of ppw, ppr, and ppa was higher than pp40 and pp30. With the exception of ppw with crimp properties, pp30 and pp40 were found to have a hairiness index greater than ppr, ppa. In the microscopic photographs of polypropylene spun yarn, pp30, which had the highest hairiness index, was found to have a thick yarn and a large number of hairs, and ppw had hairs of 3 mm or more protruding elongated outwardly.

Nursing Method with Polypropylene Spunbonded Fabric in Rice

  • Hong, Kwang-Pyo;Kim, Jang-Yong;Kang, Dong-Ju;Kim, Yeong-Gwang;Joung, Wan-Kyu;Song, Geun-Woo;Choe, Zhin-Ryong
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.45 no.2
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    • pp.118-122
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    • 2000
  • An extensive investigation has been made for the possible utilization of polypropylene spunbonded fabrics in rice seedling nursery. Considering the cropping systems available in southern part of Korea, sowing dates were fixed at April 5 and April 20 for single cropping and May 6 and May 26 for double cropping. Nursery period was fixed to 35 days for each sowing date. Four different thickness of polypropylene spunbonded fabrics, 40, 60, 80, 100 g/$m^2$, were tested in rice seedling nursery. The temperature and light intensity were not significantly different among the thickness of polypropylene spunbonded fabrics. Light intensity was significantly reduced in polypropylene spunbonded fabric (72.2 Klux) compared with polyethylene mm (85.5 Klux), however, the reduced light intensity was enough for seedling growth. The temperature in the polypropylene spunbonded fabric covering during low air temperature was higher than that in polyethylene mm tunnel. At transplanting, the rice seedlings grown in polypropylene spunbonded fabric condition was shorter (17cm) but healthier than those in polyethylene mm (23cm). The estimated possible nursery periods using the polypropylene spunbonded fabric covering may start from April 1 at Chinju (plain area in Southern Korea, 20m altitude) and April 15 at Susang (mountainous area, 430m altitude). Labour hours and cost were reduced by about 28% and 48%, respectively.

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Mechanical Characteristics of Reinforced Soil(II) -Fiber Reinforced Soil- (보강 혼합토의 역학적 특성(II) -섬유 혼합토-)

  • Song, Chang Seob;Lim, Seong Yoon
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.5 no.6
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    • pp.37-42
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    • 2002
  • This study has been performed to investigate the physical and mechanical characteristics of compaction, volume change and compressive strength for reinforced soil mixed with polypropylene fiber, and to confirm the reinforcing effects with admixture such as polypropylene fiber. To this end, a series of compaction test and compression test was conducted for clayey soil(CL) and polypropylene fiber reinforced soil. In order to determine proper moisture contents and mixing ratio, pilot test was carried out for natural soil and PFRS(polypropylene fiber reinforced soil). And the mixing ratio of mono-filament fiber and fibrillated polypropylene fiber admixture was 0.1%, 0.3%, 0.5% and 1.0% by the weight of dry soil. From the experimental results, it was found that the optimum moisture contents(OMC) increased with the mixing ratio of fiber, but the maximum dry unit weight and the volume change was decreased with the mixing ratio. It means that the improvement of the workability and the reduction of the weight of embankment was done by the addition of the polypropylene fiber. And, from the compression test results, it was found that the addition of the polypropylene fiber remarkably improved the compressive strength of PFRS. And it was observed in the viewpoint of strength that the fibrillated polypropylene fiber reinforced soil was more effective than the mono-filament polypropylene fiber reinforced soil.

Characteristics of Compaction and Stregth for Synthetic Fiber Reinforced Soils (섬유 보강토의 다짐 및 강도 특성)

  • 송창섭
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.41 no.5
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    • pp.93-98
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    • 1999
  • The results of an experimental investigation on the characteristics of compaction and compressive strength of polypropylene fiber reinforced soil are presented in this paper. This study has been performed to obtain the physical properties of PFRS(polypropylene fiber reinforced soil) such as strain-stress relationships, OMC(optimum moisture contents) and ${\gamma}$dmax (maximum dry unit weight), with four different contents (i.e., 0.1%, 0.3%, 0.5% and 1.0% weights ) of mono-filament and fibrillated polypropylene fibers. From the compaction test results, it is found that OMC increased with the contents ratio of fiber, but ${\gamma}$dmax decreased. It means that the improvement of the workability and the reduction of the weight of embankment structures by the asddtion of the polypropylene fiber. And, from the compression test results, it is found that the additon of the polypropylene fiber remarkably improved the compressive strength of PFRS. And it was observed in the viewpoint of strength that the fibrillated polypropylene fiber reinforced soil is more effective than the mono-filament polypropylene fiber reinforced soil.

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Mechanial and Drying Shrinkage Properties of Polypropylene Fiber Reinforced High Flow Concrete (폴리프로필렌 섬유보강 고유동 콘크리트의 역학적 및 건조수축 특성)

  • Noh , Kyung-Hee;Sung , Chan-Yong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.46 no.5
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    • pp.79-85
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    • 2004
  • This study was performed to evalute mechanical and drying shrinkage properties of polypropylene fiber reinforced high flow concrete. The compressive strength and drying shrinkage ratio were increased with increasing the binder volume ratio and decreased with increasing the content of polypropylene fiber. The splitting tensile strength was increased with increasing the binder volume ratio and the content of polypropylene fiber. The flexural strength was increased with increasing the binder volume ratio and increased by the polypropylene fiber content 0.4%, but above the polypropylene fiber content 0.6% was decreased. This concrete can be used for high flow concrete.