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- 주제어 : Polypropylene/wood flour composite (검색결과 7 건)
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목분의 크기가 폴리프로필렌/목분 복합재료의 물성에 미치는 영향
서용원(Yong Won Seo),김대수(Dae Su Kim) 한국고분자학회 2014 폴리머 Vol.38 No.3
고분자/목분 복합재료는 경제적이고 친환경적이기 때문에 최근 많은 관심을 끌고 있다. 본 연구에서는 목분의크기가 폴리프로필렌/목분 복합재료의 열적, 기계적 특성에 미치는 영향을 조사하였다. 용융혼합 및 압축성형에 의해 제조된 복합재료 샘플의 기계적 특성을 조사하기 위해 만능재료시험기와 아이조드 충격시험기를 사용하였고, 열적 특성을 조사하기 위해 TGA, DMA, DSC 및 TMA를 사용하였다. 말레산 무수물로 개질된 폴리프로필렌 커플링제 3종을 테스트하여 최적의 커플링제를 선정하였으며 동일조건 하에서 목분의 크기가 복합재료의 물성에 미치는영향을 살펴보았다. 600, 250, 180, 150 μm의 네 가지 목분 크기에 대해 실험한 결과 목분의 크기가 작을수록 복합재료의 굴곡강도, 굴곡탄성률, 결정화도 및 내수성이 증가하였다. Polymer/wood flour composites are recently attracting a lot of interest because they are economic and ecofriendly. In this study, the effects of wood flour size on the thermal and mechanical properties of a polypropylene/woodflour composite were investigated. Mechanical properties of the composite samples prepared by melt-mixing and compressionmolding were tested by UTM and an izod impact tester, and thermal properties of them were measured by TGA,DMA, DSC and TMA. The best coupling agent was selected by testing three kinds of maleic anhydride modifiedpolypropylene coupling agents, and under the same condition, the effects of wood flour size on the physical propertiesof the composite were investigated. According to the test results for four different wood flour sizes of 600, 250, 180 and150 μm, flexural strength, flexural modulus, crystallinity and water-resistivity of the composite increased with decreasingwood flour size.
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Lam H Pham,Linh T Pham,DongQuy Hoang,김진환 한국고분자학회 2019 Macromolecular Research Vol.27 No.12
By adding diammonium phosphate (DAP) or aluminum diethyl phosphinate (OP) as flame retardants, flame retardancy of composites based on polypropylene and wood flour (PP-WF) improved significantly. A loading of 25 wt% DAP achieved a UL-94 V-0 rating as well as LOI value of 29%, which increased by 52.6% compared with that of the PP-WF composite alone. A 30 wt% OP loading provided a rating of UL-94 HB standard, and achieved LOI value of 28%. Meanwhile, the PPWF composite without flame retardant, completely burned to the sample holder clamp with low LOI value (19%). Thermal properties of the PP-WF composite with and without DAP and OP flame retardants, were investigated using TGA and DSC. Flame retardant performance was also studied, through the morphology and chemical structure of residual char by TGA, FTIR, SEM, and XPS analyses. There was interaction between DAP and the composite, which played a key role in maintaining mechanical properties of the material.
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Preparation and Physical Properties of Wood Flour/Recycled Polypropylene Composites
( Seong Ho Ahn ),( Dae Su Kim ) 충북대학교 산업과학기술연구소 2020 산업과학기술연구 논문집 Vol.34 No.2
Wood plastic composites (WPCs) are environmentally friendly because they can be manufactured using waste woody materials and recycled plastics. However, studies performed on using recycled plastics to produce WPCs are still limited. Therefore, in this study, WPCs were prepared by melt-blending followed by compression molding using two kinds of commercially available post-industrial recycled polypropylenes (PPs) and six kinds of coupling agents, and their physical properties were investigated to find a reasonable solution to recycle the recycled PPs. Mechanical properties of the WPCs were investigated by UTM and izod impact tester. Water absorption characteristics of the WPCs were also tested. The WPC with the recycled PP from PP car bumpers and the maleic anhydride PP copolymer with relatively higher maleic anhydride content and higher melting temperature showed most reasonable, commercially applicable physical properties, though its physical properties were slightly lower than those of the WPC with the virgin PP.
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Lam H Pham,Hai D Nguyen,김진환,DongQuy Hoang 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
Thermal properties and the flame retardancy of polypropylene/wood flour (PP-WF) composite were improved byadding aluminum hydrogen phosphonate (AHP) and triphenyl phosphate (TPP) flame retardants. PP-WF compositescontaining 30 wt% of AHP and 30 wt% of TPP achieved UL-94 HB standard with the horizontal burning rate of 20.8 mm/min and of 11.5 mm/min, respectively. Thermal properties of PP-WF composite with and without flame retardant, as well asthe interaction between PP-WF and flame retardant were investigated through TGA analysis. The flame retardant mechanismis mainly in condensed phase for AHP and in gas phase for TPP. The residual char after the decomposition of PP-WF/AHPcomposite was analyzed by FTIR to understand how the formation of char affected on the flame retardancy and thermalstability PP-WF composite.
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재활용 폴리프로필렌의 함량이 목분/폴리프로필렌 복합체의 물성에 미치는 영향
안성호(Seong Ho Ahn),김대수(Dae Su Kim) 한국고분자학회 2014 폴리머 Vol.38 No.2
본 연구에서는 재활용 폴리프로필렌을 첨가한 wood plastic composite(WPC)의 물성을 극대화하기 위해 먼저용융혼합 조건을 최적화하였으며 재활용 폴리프로필렌의 함량이 WPC의 물성에 미치는 영향을 조사하였다. WPC의 기계적 특성을 측정하기 위해 만능재료시험기와 충격시험기를 사용하였고 열적 특성을 조사하기 위해 DSC, TGA, DMA를 사용하였다. SEM을 이용하여 WPC의 파단면을 관찰하였다. 전체 폴리프로필렌 함량의 50 wt%를 재활용폴리프로필렌으로 함유한 WPC의 최적가공 조건은 170 oC, 15분, 60 rpm이었다. 재활용 폴리프로필렌의 함량증가는WPC의 수분흡수성을 증가시켰고 열적, 기계적 특성을 저하시켰다. 그러나 모든 물성을 종합하여 분석한 결과WPC의 두드러진 물성 감소 없이 전체 폴리프로필렌 함량의 50 wt%까지 재활용 폴리프로필렌을 첨가하는 것이 가능하였다. In this study, the melt-mixing condition was optimized first to maximize the physical properties of a wood plas-tic composite (WPC) with recycled polypropylene (PP) and the effects of recycled PP content on the physical properties of the WPC were investigated. Mechanical properties of the WPC were measured by UTM and an izod impact tester and thermal properties were investigated by DSC, TGA and DMA. Fracture surfaces of the WPC were investigated by SEM. The optimized mixing condition of WPC with 50 wt% recycled PP of total PP was melt-mixing at 170℃ for 15 min at 60 rpm. With increasing the content of the recycled PP, the water absorption characteristics of the WPC increased and the thermal and mechanical properties decreased. However, the following was concluded from the analysis of all the physical properties; it was possible adding the recycled PP up to 50 wt% of total PP without a significant decrease in the performance of the WPC
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