• Elastomers and Composites
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• 제54권3호
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• pp.182-187
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• 2019

To improve the mechanical properties of glass-fiber-reinforced polypropylene (PP) composites through interfacial adhesion control between the PP matrix and glass fiber, the surface of the glass fiber was modified with PP-graft-maleic anhydride (MAPP). Surface modification of the glass fiber was carried out through the well-known hydrolysis-condensation reaction using 3-aminopropyltriethoxy silane, and then subsequently treated with MAPP to produce the desired MAPP-anchored glass fiber (MAPP-a-GF). The glass-fiber-reinforced PP composites were prepared by typical melt-mixing technique. The effect of chemical modification of the glass fiber surface on the mechanical properties of composites was investigated. The resulting mechanical and morphological properties showed improved interfacial adhesion between the MAPP-a-GF and PP matrix in the composites.

• 폴리머
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• 제32권1호
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• pp.7-12
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• 2008

폴리(에틸렌 테레프탈레이트) (PET) 섬유는 폴리프로필렌(PP)에 비해 높은 기계적 물성과 용융온도를 갖고있어 폴리프로필렌의 기계적 물성을 향상시키기 위한 섬유강화재료로 사용이 가능함을 확인하였다. 그러나 PP와 PET 섬유는 상용성이 부족하여 복합재료의 기계적 물성이 저하되었으며 PET 섬유의 구조적인 특성상 PP-g-MAH를 첨가하여도 효과가 부족하였다. 이러한 문제점을 해결하기 위해 NaOH 수용액으로 PET 섬유의 표면처리를 하여 PET 섬유의 표면에 친수성기를 도입하였으며 상용화제로서 PP-g-MAH를 첨가하여 기계적 물성이 우수한 PP/PET 섬유 복합재료를 제조하고 SEM과 IR의 결과와 물성의 거동을 상호 관련지었다.

• 터널과지하공간
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• 제14권4호
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• pp.241-247
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• 2004

본 연구에서는 숏크리트 보강용으로 폴리프로필렌 섬유의 표면을 무수말레인산이 그라프트된 폴리프로필렌(mPP)으로 표면 개질 처리한 새로운 폴리프로필렌 섬유를 개발하고, 개발된 섬유의 분산성을 조사하였다. 이 보강섬유가 혼입된 숏크리트의 강도 특성을 조사하였다.

• 한국농공학회논문집
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• 제54권6호
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• pp.151-158
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• 2012

This study will not only prove experimental dynamic properties which are classified to slump, compressed strength, bending strength and toughness index blast-furnace cement concrete with polypropylene (PP) fiber that refer properties and volume of it, but also establish a basic data in order to use PP fiber reinforced blast-furnace cement concrete. The slump didn't changed by PP fiber volume $5kgf/m^3$ because of flexibility of fiber in despite of loose mixing. The reason why the slump decreased steadily by PP fiber volume $3kgf/m^3$ was rising contact surface of water. The compressed strength indicated a range of 19.49~26.32 MPa. The tensile strength indicated a range of 2.10~2.44 MPa. The bending strength was stronger about 3~16 % in case of mixing with PP fiber volume than normal concrete. The flexure strength indicated a range of 4.30~4.83 MPa. The toughness indicated a range of $0{\sim}19.88N{\cdot}mm$ and was stronger about 6.7 times in case of PP fiber volume $9kg/m^3$ than PP fiber volume $1kg/m^3$. The pavement with PP fiber volume over such a fixed quantity in the roads of a respectable amount load can have a effect to prevent not only resistance against clack but also rip off failures.

• 한국염색가공학회지
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• 제10권5호
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• pp.13-18
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• 1998

Polypropylene-ethylene/vinyl acetate copolymer (PP-EVA) blends were prepared by mechanical blending using relatively semi-crystaline ethylene-vinyl acetate copolymer and polypropylene. In order to obtain dyeable PP fiber, PP-EVA blends were prepared using below 10wt.％ of EVA and formed a filament by the melt spinning method. The resultant fibers had tensile strengh of 2∼3g/d, elongation of 330∼600%, initial modulus of 22∼46g/d, and exhibited markedly improved dyeing property.

• 한국농공학회논문집
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• 제55권1호
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• pp.1-8
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• 2013

This study will not only prove experimental dynamic properties which are classified to slump, compressive strength, tensile strength, flexure strength and toughness granite soil concrete with a fine aggregate of granite soil and blast-furnace cement and polypropylene fiber over 45 mm, but also establish a basic data in order to use environment-friendly pavement through prove useful pavement mixed with granite and polypropylene (PP) fiber which is a kind of material to prevent a dry shrinkage clack, a partial destruction and useful and light. The value of slump test was gradually increased by PP fiber volume 3 $kgf/m^3$, but compressive strength took a sudden turn for the worse from 5 $kgf/m^3$. The compressive strength indicated a range of 13.72~18.35 MPa. On the contrary to compressive strength, the tensile strength showed to decrease with rising PP fiber volume, and the tensile strength indicated a range of 1.43~1.64 MPa. The tensile strength was stronger about 2~15 % in case of mixing with PP fiber volume than normal concrete. The flexural strength indicated a range of 2.76~3.41 MPa. The flexural strength was stronger about 20 % in case of PP fiber volume 0 $kg/m^3$ than PP fiber volume 9 $kg/m^3$. The toughness indicated a range of 0~25.46 $N{\cdot}mm$ and increased proportionally with PP fiber volume. The toughness was stronger about 8.3 times in case of PP fiber volume 9 $kg/m^3$ than PP fiber volume 1 $kg/m^3$. The pavement with PP fiber volume over such a fixed quantity in the park roads and walkways can have a effect to prevent not only resistance against clack but also rip off failures.

• 대한토목학회논문집
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• 제31권2A호
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• pp.137-143
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• 2011

본 연구는 섬유보강 시멘트 모르타르에서 무수말레인산이 그라프트된 폴리프로필렌(maleic anhydride grafted polypropylene, mPP) 분말의 첨가가 무극성 마크로 합성섬유(마크로 합성섬유)의 부착특성에 미치는 효과를 평가하였다. 다양한 mPP의 첨가율(시멘트 중량의 0%, 5%, 10%, 15%, 20%, 25%, 30%)에 따른 시멘트 모르타르와 마크로 합성섬유의 부착거동을 평가하기 위하여 Dog-bone 부착시험을 수행하였다. 시멘트 모르타르내에서 마크로 합성섬유의 부착 특성(일반거동, 인발하중 및 계면인성)은 mPP의 사용량 증가할수록 증가하였다. 인발시험 후 마크로 합성섬유 표면의 미세구조 분석은 mPP의 첨가율에 따른 마찰 저항력을 평가하기 위하여 관찰하였다. mPP의 첨가율이 증가할수록 마크로 합성섬유 표면에 긁힘 현상이 증가하였다.

• 접착 및 계면
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• 제9권4호
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• pp.24-29
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• 2008

두 종류의 천연섬유, 즉 면섬유와 목분을 이용하여 폴리프로필렌 - 천연섬유 복합재료를 제조하고 혼합가공시 유변학적 특성과 열적특성을 고찰하였다. PP/천연섬유 복합재료에서 천연섬유의 함량이 증가함에 따라 토오크 값이 상승하였고, 면섬유의 경우 낮은 체적 밀도로 인해 목분 복합재료보다 높은 토오크값을 나타내었다. PP의 MI에 따라서는 낮은 MI의 PP/천연섬유 복합재료에서 더 높은 토오크값이 관찰되었다. X-선 회절분석과 시차주사열분석을 통해 천연섬유의 함량이 증가될수록 PP/천연섬유 복합재료의 결정화온도는 상승하나 결정화도는 감소함이 확인되었다.

• Fibers and Polymers
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• 제4권3호
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• pp.107-113
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• 2003

The branched polypropylene (b-PP) was prepared by melt blending process with initiator, antioxidant, and functional monomers to improve the melt strength through the melt grafting. The melt flow index (MFI) of the b-PP was increased with increasing the initiator content. On the introduction of the alkylamine as the branching agents the MFI of the b-PP was increased, while that of the b-PP with the pentaerythritol triacrylate (PT) was decreased. It may be caused by the chain scission of the i-PP backbone due to the reduced thermal stability of the i-PP on the melt blending. The MFI of the b-PP without the antioxidant was increased due to the chain scission occurred during the melt processing, while on the introduction of the antioxidant, the MFI of the b-PP was decreased. The crystallization temperature of the b-PP was higher than that of PP, which was attributed to the branched chain structure. It was found that the PT was the most effective functional monomers for enhancing the melt properties of the b-PP.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.124-125
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• 2017

In this study, the spalling properties of Polypropylene reinforced concrete were evaluated by the restrained ring-type test. As a result of the experiment with the fiber mixture ratio set at 0, 0.15 vol.%, The PP fiber reinforced specimen showed lower water vapor pressure as a whole than the Plain specimen, but the restraint stress was measured to be higher. This is thought to be due to the fact that higher thermal stresses were applied in the PP fiber reinforced test specimen.