Gotowe bibliografie tematyczne / Polypropylene fibrous

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Gotowa bibliografia na temat „Polypropylene fibrous”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Polypropylene fibrous"

Zhang, Hao Hua, Ji Ru Zhang i Jie Xiong. "Research on the Stressed Performance of Polypropylene Fibrous Concrete Ditch". Advanced Materials Research 255-260 (maj 2011): 3082–86. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3082.

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Polypropylene fibrous concrete is a new kind of composite material. Polypropylene fiber leads to an increase in the resisting strength, cracking resistance performance, resistance to impact performance and permeability reducing performance of the concrete, thus reduces the shrinking and deformation of the concrete. This paper uses the method of numerical analysis, assisted by the software of finite element analysis, makes both static and dynamic analysis on the polypropylene fibrous concrete ditch with different volume mixing. It results in the stress and strain table of the head and base plates of the polypropylene fibrous concrete ditch in the case of 0.1%, 0.5%, and 1% volume mixing of polypropylene fibers. The paper provides technological basis for formation design of the polypropylene fibrous concrete materials, and laids technological foundation for the further developments of polypropylene fibrous concrete in hydraulic engineering.

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Bordunov, Sergey, Olga Galtseva i Inna Plotnikova. "Obtaining Biologically Active Polypropylene Fibrous Materials". Materials Science Forum 992 (maj 2020): 764–69. http://dx.doi.org/10.4028/www.scientific.net/msf.992.764.

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The paper presents the results of the development of the technology of centrifugal-die forming of biologically active fibrous materials. The modification of biologically active polypropylene fibers was carried out directly at the process of their production in the field of centrifugal forces of rotating reactor during their molding from polypropylene melt. The properties of the obtained ion-exchange and biologically active polymer fibers are studied. It is shown that obtained and modified by the centrifugal-die method polypropylene fibers can be used as biologically active fibers.

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Wang, Ying Hao, i Xu Dong Liu. "Application and Analysis on Polypropylene Fibrous Concrete". Advanced Materials Research 250-253 (maj 2011): 682–85. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.682.

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In fuel gas project, the foundation of carburetor is in circumstance which concrete occurred freeze-thaw circulation. To meet durability of structure, polypropylene fibrous concrete was used in design to solve concrete freeze-thaw. By means of a project, this paper talks about its crack control mechanism, impermeability, frost resistance and wear-resisting strength. Furthermore, some attention is listed to use polypropylene fibrous concrete successfully.

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Novoselova, L. Yu, i E. E. Sirotkina. "Fibrous Polypropylene–Polystyrene Materials Produced Using Ultrasound". International Polymer Science and Technology 34, nr 9 (wrzesień 2007): 33–39. http://dx.doi.org/10.1177/0307174x0703400905.

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Sharova, T. B., L. A. Obvintseva, N. V. Kozlova, I. P. Sukhareva, M. P. Dmitrieva, A. D. Shepelev, A. K. Avetisov, A. I. Khorokhorin i A. S. Smolyanskii. "Ozone Resistance of Nonwoven Polypropylene Fibrous Material". Fibre Chemistry 48, nr 5 (styczeń 2017): 410–15. http://dx.doi.org/10.1007/s10692-017-9807-9.

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Xu, Jinhao, Binjie Xin i Xuanxuan Du. "Controllable Wetting Modification of Polypropylene Fibrous Mats". AATCC Journal of Research 8, nr 2_suppl (grudzień 2021): 19–22. http://dx.doi.org/10.14504/ajr.8.s2.4.

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In this study, polypropylene (PP) fibrous mats are modified by plasma treatment, following by chemical grafting. Initially, the as-prepared PP fibrous mats are treated by plasma at different oxygen (O2) and argon (Ar) ratios. Then, the PP fibrous mats are modified by grafting dopamine onto polar groups for in situ polymerizations, resulting in a polydopamine (PDA) coating on the substrate's surface. Time-sensitive wettability is thereby converted into permanent wettability in PP fibers. The morphology, chemical performance, and relative wettability of the modified PP fibers are then characterized. The experimental results show, using an O2/Ar ratio of 3:7 during plasma treatment, that the water contact angle was decreased from 114.2° to 0°, and the maximum grafting degree was 0.79%.

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Chang, Jing Cai, Ai Ping Tao, Ming Feng Gao, Chun Yan Xu i Chun Yuan Ma. "Collection of Submicron Particles by Polyethylene Composite Materials Collector". Advanced Materials Research 919-921 (kwiecień 2014): 2030–36. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.2030.

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Wet electrostatic precipitators (wet ESPs) are good options for effective control of PM2.5 emission. However, the common problems of uniform water film formed on rigid collector limited the applicability of typical wet ESPs, thus could be tend to cause "spark-over" and "back-corona". This research was designed to test the performance of the polypropylene fibrous as collection electrodes for PM2.5 control in wet ESP. Meanwhile, drop spreading feature and volume resistivity measurements of polypropylene fibrous collector were investigated. The results show that drop spreading existed in imbibitions experiments between hydrophobic fabrics contacted with water. The difference of spreading characteristics was accordance to the physical woven properties of fabrics. The relationship between the volume resistivity of polypropylene fibrous and the water addition rate has been investigated. The secondary current by polypropylene collection electrode was 5~20 percent higher than that by FRP. The average number collection efficiencies by polypropylene collector amounted to 89.21% for PM2.5 when the gas residence time was 1.33s at 60kV. The relationship between water addition rate and average number collection efficiency was not more regular than other factors such as gas treatment time or applied voltage.

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Shi, Zhen Wu, Shuang Liu i Rui Rui Zhang. "Comparative Experiment on Frost Resistance of Different Kinds of Polymer Fibrous Concrete". Advanced Materials Research 250-253 (maj 2011): 673–77. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.673.

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Based on the evaluation of fibrous concrete materials and the experiments of freezing-thawing resistance home and abroad, the present experiment takes relative dynamic modulus of elasticity and rate of mass reduction as an analytical index to conduct a comparative study on the effects of the mixing of four kinds of polypropylene fiber on the cement concrete freezing resistance. The results show that different kinds of polypropylene fiber have different influences on cement concrete freezing resistance. And some polypropylene can improve it while others may make it decreased.

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Prorokova, N. P., S. Yu Vavilova, V. M. Buznik i A. E. Zavadskii. "Modification of polypropylene fibrous materials with ultradispersed polytetrafluoroethylene". Polymer Science Series A 55, nr 11 (listopad 2013): 643–51. http://dx.doi.org/10.1134/s0965545x13110047.

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Abd Rahman, Norashidah, Siti Amirah Azra Khairuddin, Norwati Jamaluddin i Zainorizuan Mohd Jaini. "Strength of Reinforced Fibrous Foamed Concrete-Filled Hollow Section". Materials Science Forum 936 (październik 2018): 219–23. http://dx.doi.org/10.4028/www.scientific.net/msf.936.219.

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At present, research on concrete-filled sections extends to using lightweight concrete to reduce the total weight of such structures. However, research on concrete-filled hollow sections (CFHS) using foamed concrete remains ongoing. Therefore, this study was conducted to determine the strength of reinforced fibrous foamed CFHSs. Two types of fibre, namely, steel and polypropylene fibres, were used. A short-column specimen was prepared and tested under compression load. Result shows that adding steel fibre to foamed concrete indicates a higher strength than adding polypropylene fibre. The strength of the CFHS is increased by adding reinforced bar and fibre in foamed concrete.

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Rozprawy doktorskie na temat "Polypropylene fibrous"

Biyana, Nobuhle Yvonne. "Studies on flax/polypropylene-reinforced composites for automotive applications". Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/d1021150.

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The use of natural fibers as reinforcement in thermoplastics presents an interesting alternative for the production of low cost and ecologically friendly composites. One of the advantages of using natural fibres is their low specific weight, resulting in higher specific strength and stiffness when compared to glass reinforced composites. Natural fibres also present safer handling and working conditions. They are non-abrasive to mixing and can contribute to significant cost reduction. This work is divided into two phases: Phase 1 deals with developing nonwoven mats composites from flax/polypropylene (PP) and evaluating their properties. Flax/polypropylene fibres (at different weight ratios) were processed by needle-punching technique in order to form nonwoven mats. The mats were compression-molded at a temperature of 180oC to form composite materials. The mechanical, thermal and viscoelastic properties of the composites were analyzed. Composites (untreated and silane-treated) were also subjected to varying conditions of temperature and humidity and the tensile properties of the conditioned and unconditioned composites were investigated. The mechanical properties (tensile, flexural and impact) of flax/PP composites were found to increase and reach maximum values at 30 per cent fibre loading and then decrease at higher fibre content. Thermal studies revealed that the composites were stable up to 320oC and samples containing 40 per cent flax fibres were found to exhibit greater thermal stability than neat PP. The dynamic mechanical analyses of the composites showed that the incorporation of flax in the composites resulted in an increase of the storage modulus with a maximum value exhibited by composite containing 40 per cent fibre loading. Composites containing chemically modified fibres exhibited low tensile modulus after conditioning. Phase 2 is based on the investigation of the effect of nano-calcium carbonate (CaCO3) on the properties of two types of polymer matrices: recycled PP and virgin PP. In this case, composites were prepared by melt-mixing and injection molding. The mechanical and thermal properties of the composites were characterized. The tensile modulus of the nano-CaCO3 filled PP (virgin and recycled) composites were found to increase and reach maximum at 30 per cent nano-CaCO3 loading, while the tensile strength decreased with increasing filler content. Thermal studies showed that the nano-CaCO3 filled PP samples exhibited a one-step degradation pattern and are thermally stable up to 450oC. The thermal stability of the samples was found to decrease following the addition of nano-CaCO3. SEM micrographs of the tensile fractured surfaces of composites of the nano-CaCO3 filled virgin and recycled PP revealed the presence of nano-CaCO3 agglomeration.

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Jia, Jun. "Melt spinning of continuous filaments by cold air attenuation". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37276.

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Traditionally ultrafine fibers below 1 dpf are produced by extrusion followed by mechanical drawing. A modified melt spinning apparatus with high-speed air nozzle was designed and fabricated to produce continuous polypropylene filaments by cold air drawing only. With this setup, the fiber is quenched and simultaneously attenuated by a symmetric cold air jet. Since the formation of fiber structure is highly dependent on the processing conditions, the new process will provide a unique operation window to study fiber attenuation and structural formation under high-speed cold air drawing. Based on computational fluid dynamics simulation results, a parametric study was carried out under different process conditions which include processing temperature, air velocity and polymer volume flow rate. Effects of changes in processing variables on the fiber diameter, molecular orientation, crystallinity, tensile strength and other properties were studied. Furthermore, a theoretical model was developed to analyze the non-isothermal fiber attenuation mechanisms. The new knowledge obtained in this study would likely yield a new process for producing innovative fiber products.

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Kalyankar, Rahul R. "Natural fiber reinforced structural insulated panels for panelized construction". Birmingham, Ala. : University of Alabama at Birmingham, 2009. https://www.mhsl.uab.edu/dt/2010r/kalyankar.pdf.

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Slánská, Petra. "Aplikace termochromních látek v polymerních materiálech". Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216383.

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V textilním průmyslu je v dnešní době veliká konkurence. Každá novinka může znamenat velký zisk. Tato diplomová práce se bude zabývat aplikací termochromních přísad (látka reagující na teplotu změnou své barvy) do polymerní matrice, konkrétně polypropylenu, a jeho další zpracování u výrobce technického polotovaru - výroba vláken. Po výrobě vzorků bude provedeno jejich testování. Porovnají se vlastnosti polypropylenu s a bez termochromních přísad a zhodnotí se, nakolik tyto přísady ovlivňují vlastnosti polypropylenu. Ze získaných výsledků se stanoví možnost využití termochromních přísad v textilním průmyslu.

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Badji, Célia. "Vieillissement de matériaux composites renforcés de fibres naturelles : étude de l’impact sur les propriétés d’aspect et sur les émissions dans l’air intérieur". Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3022/document.

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Les biocomposites sont des matériaux renforcés de fibres issues de ressources renouvelables. Ces matériaux sont une solution alternative aux composites renforcés de fibres de verre ou de carbone. En effet, leur légèreté et leurs propriétés mécaniques intéressantes leur confèrent un intérêt grandissant dans les secteurs tels que la construction (terrasse, meubles de jardin) ou l’automobile (panneaux de porte, tableaux de bord). Toutefois, les milieux humides, la température et le rayonnement UV sont des paramètres pouvant compromettre la stabilité physico-chimique des biocomposites. L’objectif principal de cette thèse a été d’évaluer la durabilité des biocomposites sous leurs conditions d’usage principales. Pour cela, ces matériaux ont été exposés pendant une année à l’extérieur (lames de terrasse) et sous vitre pare-brise (tableaux de bord). Les résultats ont montré que, bien que la performance mécanique des biocomposites ait été affectée, celle-ci n’a pas été grandement influencée par le type d’exposition. Par contre, les différences de variations de couleur et de cristallinité différant entre les deux expositions suggèrent des mécanismes de dégradation différents et très dépendants des conditions d’usage.Puisque les biocomposites peuvent être utilisés dans des environnements clos tels que les habitacles d’automobile, ils peuvent être également des sources de polluants dans l’air intérieur. L’étude des émissions de composés organiques volatils (COV) par les biocomposites au cours de leur vieillissement sous vitre pare-brise, a permis de générer des données nécessaires à l’évaluation de l’impact sur la qualité de l’air intérieur de véhicule de ces nouveaux matériaux. Cependant, l’augmentation drastique de la concentration de surface en COV au cours du vieillissement suggère que l’exposition a fortement affecté les biocomposites à cause de la sensibilité des composants structurant les fibres végétales face aux conditions d’exposition.La compréhension des mécanismes de dégradation peut s’effectuer à travers l’interprétation des liens de causalité entre les propriétés mécaniques et de microstructure, les émissions de COV, et l’apparence visuelle. Un traitement statistique par analyse en composantes principales (ACP) a ainsi permis de dégager les relations entre les paramètres quantitatifs.Le vieillissement naturel nécessite souvent une durée d’exposition longue pour apercevoir une dégradation effective des matériaux. De ce fait, le vieillissement accéléré en enceinte de laboratoire est de plus en plus réalisé en industrie permettant un gain de temps. Afin de vérifier la représentativité des mécanismes de dégradation en environnement extérieur par l’enceinte, une étude comparative entre le vieillissement naturel extérieur et un vieillissement accéléré en enceinte a été menée
Biocomposites are fiber-reinforced materials from renewable resources. These materials are an alternative to fiberglass or carbon reinforced composites. Indeed, their lightweight and interesting mechanical properties give them a growing interest in sectors such as building (decking, garden furniture) or automobile (door panels, dashboards). However, humidity, temperature and UV radiation are parameters that can compromise the physicochemical stability of biocomposites.The main objective of this thesis is to assess the biocomposites durability in their main conditions of use. For this purpose, these materials have been exposed for one year outdoors (deck boards) and under windshield glass (dashboards). The results showed that the mechanical performance of biocomposites was affected and greatly influenced by the type of exposure. On the other hand, the differences in color and crystallinity variations that differ between the two exposures suggest different degradation mechanisms that are very dependent on the conditions of use.Since biocomposites can be used in environments such as the passenger cabin, they can also be sources of pollutants in indoor air. The study of emissions of volatile organic compounds (VOCs) by biocomposites during their ageing under windshield glass allowed generating data necessary for the evaluation of the impact on the car indoor air quality of these new materials. However, the drastic increase of VOCs surface concentration during exposure suggests that weathering strongly affected biocomposites due to the sensitivity of the structural components of plant fibers to exposure conditions.Understanding of the degradation mechanisms can be carried out through the interpretation of the causal links between mechanical and microstructural properties, VOC emissions and visual appearance. Statistical treatment by Principal Component Analysis (PCA) revealed the links and relationships existing between the quantitative parameters.Natural weathering often requires long time of exposure for an efficient perception of the materials degradation. Thus, accelerated ageing in laboratory is more and more carried out in industry for time saving. In order to verify the representativeness of the degradation mechanisms occurring during exterior weathering by weathering chambers, a comparative study between the exterior aging and the artificial aging was carried out

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Pliya, Bidossessi amen prosper. "Contribution des fibres de polypropylène et métalliques à l'amélioration du comportement du béton soumis à une température élevée". Thesis, Cergy-Pontoise, 2010. http://www.theses.fr/2010CERG0479/document.

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Le but de ce travail de recherche est d'étudier l'effet de fibres de polypropylène et de fibres métalliques sur le comportement du béton soumis à une température élevée. D'une part, les fibres de polypropylène ont été ajoutées au béton pour améliorer sa stabilité thermique, et d'autre part les fibres métalliques ont été ajoutées au béton pour améliorer ses propriétés mécaniques résiduelles. De nouvelles formulations de béton ont ensuite été définies, en utilisant un cocktail de fibres de polypropylène et métalliques, afin d'améliorer à la fois la stabilité thermique et les propriétés mécaniques résiduelles du béton. Quatre familles de bétons ont été étudiées : - bétons témoins sans fibres, - bétons contenant des fibres de polypropylène, - bétons contenant des fibres métalliques, et – bétons contenant un cocktail de fibres de polypropylène et métalliques. Trois rapports eau/ciment sont utilisés : 0.30, 0.45 et 0.61. Les éprouvettes de béton, issues de ces compositions, ont été soumises à des cycles de chauffage – refroidissement de la température ambiante à une température de consigne de 150°C, 300°C, 450°C et 600 °C. La vitesse de chauffage a été fixée à 1 °C.min-1. Les teneurs en fibres étaient de 0.11, 0.17 ou 0.22 % en proportion volumique pour les fibres de polypropylène et de 0.25, 0.38 ou 0.51 % pour les fibres métalliques. Les proportions volumiques de cocktail de fibres étaient de 0.49, 0.60, 0.62 et 0.73%. La stabilité thermique, les propriétés mécaniques (résistance en compression, résistance en traction, module d'élasticité), la porosité initiale et résiduelle des bétons formulés ont été analysées. La perte de masse des éprouvettes lors des différents chauffages a été aussi mesurée.Cette étude expérimentale aboutit à la formulation de bétons dont à la fois la stabilité à haute température et le comportement mécanique après refroidissement sont améliorés
The aim of this study was to investigate the effect of polypropylene and steel fibres on the behaviour of concrete subjected to high temperature. Polypropylene fibres were added to the studied concrete mixes in order to improve the concrete thermal stability. Steel fibres were added to the studied concrete mixes in order to improve the concrete residual mechanical properties. News concretes mixes were then designed by adding a cocktail of polypropylene fibres and steel fibres in order to improve both the thermal stability and the residual mechanical properties of the studied concrete. Four groups of concrete mixes were studied: - concretes without fibres, - concretes with polypropylene fibres, - concretes with steel fibres, and - concretes with a cocktail of polypropylene and steel fibres. Three water/cement ratios were used: 0.30, 0.45 and 0.61. The concrete specimens were subjected to various heating – cooling cycles from the room temperature to 150°C, 300°C, 450°C and 600 °C. The heating rate was fixed at 1 °C.min-1. The amounts of fibres in the concrete were 0.11%, 0.17% or 0.22% in volume for polypropylene fibres and 0.25%, 0.38% or 0.51% in volume for steel fibres. The amounts of fibres in concrete with a cocktail of polypropylene and steel fibres were 0.49, 0.60, 0.62 and 0.73%, in volume. The thermal stability, the initial and residual mechanical properties (compressive strength, tensile strength, modulus of elasticity), the porosity and the mass loss of the studied concrete mixes were investigated.This experimental study shows a way to design a concrete mix in order to improve both the thermal stability and the residual mechanical properties

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Haczycki, S. J. "The behaviour of polypropylene fibres in aggressive environments". Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236516.

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Soccalingame, Lata. "Étude des scénarios de fin de vie des biocomposites : vieillissement et retransformation de biocomposites PP/farine de bois et PLA/fibres de lin". Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20082/document.

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Les matériaux biocomposites, en particulier les composites matrice thermoplastique biosourcée ou non renforcée de charges ou de fibres végétales, connaissent actuellement un essor significatif et présentent pour l'avenir un gisement grandissant de matières en fin de vie. En conséquence, l'étude du comportement de ces matériaux au regard de différents scénarios de fin de vie que sont le recyclage mécanique, le compostage et l'incinération constitue un enjeu scientifique et technologique important. Le premier objectif de cette thèse est d'étudier la fin de vie par retransformation (cycles successifs d'injection et de broyage) de biocomposites à matrice polypropylène (PP) chargé de farine de bois. L'impact de la taille des particules de bois et d'un agent de couplage a été évalué. Une très bonne stabilité mécanique jusqu'à 7 cycles de retransformation a été observée malgré des dégradations des différents composants du matériau. Le comportement face à la retransformation après vieillissement artificiel accéléré ou après une exposition naturelle en extérieur a été étudié. La tendance majeure dégagée est un phénomène de « régénération » des propriétés mécaniques par retransformation, et cela malgré des dégradations importantes après vieillissement. Il a été également été observé que l'ajout de bois a tendance à limiter la photodégradation du PP. Le second objectif est d'étudier la fin de vie de biocomposites à matrice acide polylactique (PLA) renforcé de fibres de lin. L'impact de différents paramètres de formulation, de la technique de mise en œuvre et d'un vieillissement hygrothermique sur la retransformation de ces matériaux a été évalué. Les mêmes phénomènes de « régénération » sont observés, ce qui montre l'effet bénéfique de la retransformation. La fin de vie par compostage et par biodégradation est traitée. Des mesures d'énergies de combustion ont enfin permis d'estimer le potentiel de valorisation par incinération qui serait en lien avec le niveau de dégradation du PLA
Nowadays, biocomposite materials are booming and will be a growing end-of-life issue for the future. They are based on a thermoplastic matrix (oil-based or bio-based) reinforced with vegetable fillers or fibers. Consequently, the study of their end of life through recycling, composting and incineration is a scientific and technologic challenge.The first goal of this thesis is to study the reprocessing end of life (successive injection and grinding cycles) of polypropylene (PP) based biocomposites filled with wood flour. The impact of the wood particle size and a coupling agent was assessed. Thus, a very good mechanical stability was observed up to 7 reprocessing cycles despite some degradation from the material components. Then, the reprocessing after artificial or natural UV weathering was carried out. The major trend is a “regeneration” phenomenon of mechanical properties after reprocessing in spite of strong degradations after UV weathering. Moreover, the addition of wood filler tends to restrain the PP photochemical degradation.The second goal is to study the end of life of polylactic acid (PLA) based biocomposites reinforced with flax fibers. The impact of the composition, the processing technic and humidity weathering on the reprocessing was assessed. Similar “regeneration” phenomena were observed leading to conclude to the beneficial effect of reprocessing. Then composting and biodegradation aspects were investigated. Heat release rate measurements enabled to estimate the incineration potential which could be linked to the PLA degradation rate

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Espert, Ana. "Natural fibres/polypropylene composites from residual and recycled materials". Licentiate thesis, KTH, Fibre and Polymer Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1667.

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Natural fibres fulfil all the requirements in order toreplace inorganic fillers in thermoplastic composites. Naturalfibres are inexpensive, renewable, biodegradable, present lowerdensity and their mechanical properties can be compared tothose of inorganic fillers. However, several disadvantagesappear when natural fibres are used for composites. First ofall, the poor compatibility between the hydrophilic fibres withthe hydrophobic thermoplastic matrix leads to a weak interface,which results in poor mechanical properties. On the other hand,the hydrophilic nature of the fibres makes them very sensitivetowards water absorption, which leads also to the loss ofproperties and the swelling and dimensional instability.

In order to enhance the compatibility fibre-matrix, thefibres were chemically surface modified by five differentmethods: a) graft copolymerisation withpolypropylene-graftedmaleic anhydride copolymer (PPgMA), b)modification by PPgMA during processing, c) modification byorganosilanes, d) acetylation, e) modification with peroxideoligomers. Modified fibres led to improved mechanicalproperties and thermal behaviour when used in composites withpost-industrial polypropylene (PP) containing ethylene vinylacetate copolymer (EVA). Modification with peroxide oligomersshowed very promising results, but modification with PPgMA waschosen for further preparation of composites due to itssimplicity.

Two sets of composites were prepared using two differentpolypropylene types as matrix: virgin polypropylene (PP) andthe above mentioned post-industrial polypropylene (PP/EVA).Four different types of cellulosic fibres were used as fillers:cellulose fibres from pulping, sisal fibres, coir fibres andLuffa sponge fibres. The mechanical properties of thecomposites were dependent mostly on the fibre loading andslightly on the type of fibre. The fibers changed thecharacteristics of the material leading a higher stiffness buta lower toughness.

Water absorption of composites was studied at threedifferent temperatures: 23°C, 50°C and 70°C. Thewater absorption kinetics were studied and it was found thatwater is absorbed in composites following the kineticsdescribed by the Fickian diffusion theory. After absorption, animportant loss of properties was observed, due to thedestruction of the fibre structure due to the waterabsorbed.

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Doan, Thi Thu Loan. "Investigation on jute fibres and their composites based on polypropylene and epoxy matrices". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1149143661135-69962.

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- Matrix modification of jute/polypropylene composites with MAHgPP - Fibre surface modification for epoxy/jute composites, including: NaOH treatment, silane coupling agents, epoxy dispersion and their combinations - Investigation the influence of modification on the performance of jute fibre and jute compostites
Untersuchungen zum mechanischen und thermischen Verhalten sowie zur Benetzung von Jutefasern im Ausgangszustand, nach Entwachsen und nach Oberflächenmodifikation, mit dem Ziel einer Verwendung als Verstärkungsfasern in Verbundwerkstoffen. Untersuchungen zum mechanischen und thermischen Verhalten sowie zur hygrothermischen Alterung von Jute/Polypropylen (PP) Verbunden. Einfluss des PP-Typs, der Modifizierung der Matrix mit Maleinsäureanhydrid gepfropftem PP und des Faservolumengehalts.Untersuchung der Grenzschicht in Jute/Epoxidharz Verbunden in Hinblick auf die mechanischen Eigenschaften nach Alkalibehandlung und Oberflächenmodifikation der Jutefasern. Jutefasern haben gute spezifische mechanische Eigenschaften. Die Einzelfasereigenschaften unterliegen der bei Naturfasern üblichen Streuung der mechanischen Eigenschaften. Im Gegensatz zu konventionellen Verstärkungsfasern (Glas, Carbon) nimmt wachstumsbedingt mit zunehmendem Faserquerschnitt die Festigkeit tendenziell zu. Faseroberflächenbehandlungen verbessern die Benetzbarkeit, erhöhen die thermische Stabilität und reduzieren die Feuchteaufnahme sowie den Diffusionskoeffizient. Jute/Polypropylen-Verbunde Chemische und physikalische Wechselwirkungen zwischen Faser und MAHgPP nach optimierter Kopplerauswahl verbessern in Abhängigkeit vom PP-Typ die Grenzflächenscherfestigkeit und die mechanischen Eigenschaften. Durch Einbeziehen der Grenzflächeneigenschaften können mit einer modifizierten Mischungsregel die Zugfestigkeiten der Verbunde beschrieben werden. Jute/Epoxidharz-Verbunde Faseroberflächenbehandlungen mit Natronlauge, Organosilanen, Epoxiddispersionen und deren Kombinationen führen zu verbesserter Benetzung, reduzierter Wasseraufnahme und verbesserter Haftung sowie verbesserten mechanischen Eigenschaften in Jute/Epoxidharz-Verbunden

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Książki na temat "Polypropylene fibrous"

Sarvaranta, Leena. Characterization methods for polypropylene fibre-reinforced cement mortar composites. Espoo, Finland: Technical Research Centre of Finland, 1993.

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Yin, Shi. Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1.

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Ugbolue, S. C. O. Polyolefin fibres: Industrial and medical applications. Cambridge: Woodhead Publishing Ltd, 2009.

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Moeiri-Farsi, M. H. Effects of autoclave temperatures on properties of cementitious based matrices reinforced with randomly orientated polypropylene fibres. Salford: University of Salford, 1993.

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Yin, Shi. Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete. Springer, 2018.

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Yin, Shi. Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete. Springer, 2017.

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National Register of Foreign Collaborations (India) i India. Dept. of Scientific & Industrial Research., red. Technology in Indian polypropylene fibre and filament yarn industry: A status report prepared under the National Register of Foreign Collaborations. New Delhi: Govt. of India, Dept. of Scientific & Industrial Research, Ministry of Science & Technology, 1990.

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Ugbolue, S. C. O. Polyolefin Fibres: Industrial and Medical Applications. Elsevier Science & Technology, 2009.

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Ugbolue, S. C. O. Polyolefin Fibres: Structure, Properties and Industrial Applications. Elsevier Science & Technology, 2017.

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Ugbolue, S. C. O. Polyolefin Fibres: Structure, Properties and Industrial Applications. Elsevier Science & Technology, 2017.

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Części książek na temat "Polypropylene fibrous"

Atikler, Ulas, i Funda Tihminlioglu. "Influence of Surface Treatment of Fillers on Mechanical, Surface, and Water Sorption Behavior of Natural-Fiber-Reinforced Polypropylene Composites". W Spherical and Fibrous Filler Composites, 157–79. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527670222.ch6.

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Sen, Kushal. "Polypropylene fibres". W Manufactured Fibre Technology, 457–79. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5854-1_16.

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Marcian, V. "MORPHOLOGY OP POROUS POLYPROPYLENE FIBRES". W Morphology of Polymers, redaktor Blahoslav Sedláček, 573–84. Berlin, Boston: De Gruyter, 1986. http://dx.doi.org/10.1515/9783110858150-055.

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Dave, Trudeep N., Dhavalkumar Patel, Gafur Saiyad i Nirmal Patolia. "Use of Polypropylene Fibres for Cohesive Soil Stabilization". W Lecture Notes in Civil Engineering, 409–17. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0890-5_34.

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Yin, Shi. "Introduction". W Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete, 1–7. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1_1.

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Yin, Shi. "Literature Review". W Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete, 9–50. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1_2.

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Yin, Shi. "Production and Characterisation of the Physical and Mechanical Properties of Recycled PP Fibers". W Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete, 51–68. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1_3.

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Yin, Shi. "Comparative Evaluation of 100% Recycled and Virgin PP Fibre Reinforced Concretes". W Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete, 69–89. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1_4.

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Yin, Shi. "Post-cracking Performance of Concrete Reinforced by Various Newly Developed Recycled PP Fibres". W Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete, 91–101. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1_5.

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Yin, Shi. "Environmental Benefits of Using Recycled PP Fibre Through a Life Cycle Assessment". W Development of Recycled Polypropylene Plastic Fibres to Reinforce Concrete, 103–22. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3719-1_6.

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Streszczenia konferencji na temat "Polypropylene fibrous"

Avdeeva, Katerina, Alena Shumskaya, Zhanna Ignatovich, Alexander Rogachev, Vladimir Agabekov, Maxim Yarmolenko, Aleksey Mikhalko, Nataliya Dudchik i Aleksey Oleynik. "Modified Polypropylene Fibrous Nonwoven Materials". W 2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2021. http://dx.doi.org/10.1109/nap51885.2021.9568574.

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Leong, Yee-Tian, Meng-Hau Sung i David Kuo. "Nutrient Removal Efficiency of a Fibrous Polypropylene Biofilm Reactor in Pilot Scale". W The 8th World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2023. http://dx.doi.org/10.11159/iceptp23.144.

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Da Costa Santos, Ana Caroline, i Paul Archbold. "Experimental Investigation on the Fracture Energy and Mechanical Behaviour of Hemp and Flax Fibre FRC Compared to Polypropylene FRC". W 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.326.

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Natural fibre reinforced concrete is been studied for many years as a more sustainable option to current reinforced concrete used in industry. The most common fibre materials currently adopted are steel, glass and synthetic fibres. Apart from the high oxidation and cost, their environmental impact is a serious issue as they are petroleum-based materials. This study assesses the feasibility of replacing polypropylene fibre with hemp and flax fibres. According to the inventory of carbon and energy (ICE) the embodied energy of polypropylene (PP) is 95.4MJ/kg and the embodied carbon is 4.98kgCO2/kg during its lifetime. It represents approximately 3 times more than the estimated values for vegetable fibres. For this, Different concrete mixtures reinforced by 0.5% to 1.0% of hemp, flax and polypropylene fibres were tested, and their post-crack flexural tensile strength, elastic’s modulus, compressive strength and fracture energy were evaluated. The mixtures containing hemp fibres presented properties equivalent to those containing polypropylene under the same proportion. Although both compressive and tensile strength were reduced for the mixes containing flax fibres, the Young’s modulus was 49% smaller and could be an interesting approach for applications that require better elasticity from the concrete, such as industrial floors and structures that may be submitted to impact.

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Pavlin, Majda, Barbara Horvat i Vilma Ducman. "Fibre Reinforced Alkali-Activated Rock Wool". W International Conference on Technologies & Business Models for Circular Economy. University of Maribor Press, 2022. http://dx.doi.org/10.18690/um.fkkt.2.2022.6.

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Mineral wool, i.e. rock and glass wool, represents considerable challenge after its functional-time runs out due to its small density leading to large volume consumption during transport and in landfills where it usually ends. Because rock wool is mineralogically and chemically a promising precursor material for alkali-activation, it was milled from few centimetres-decimeters long fibres to micron-sized fibres. Since fibres in alkali-activated materials generally show an increase in mechanical strength, especially the bending strength, 1 m% of additional fibres (basalt, cellulose (2 types), glass, polypropylene, polyvinyl alcohol and steel fibres) was used in the alkali mixture, that was curred at 40 °C for 3 days. Time dependence of the mechanical strengths of alkali-activated materials with and without additional fibres was followed. Maximal increase of compressive and bending strength after 28 days was reached with polypropylene fibres, i.e. it was 20% and 30% higher than compressive and bending strength of alkali-activated material without additional fibres respectively.

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Rosli, M. S., M. H. Othman, Sri Yulis M. Amin, O. Saliza Azlina i M. A. Azis. "Rheological behaviour on Polypropylene-Nanoclay-Gigantochloa Scortechinii fibres". W PROCEEDINGS OF THE 1ST INTERNATIONAL CONFERENCE ON FRONTIER OF DIGITAL TECHNOLOGY TOWARDS A SUSTAINABLE SOCIETY. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0120879.

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Alexandrescu, Laurentia, Maria Sonmez, Mihai Georgescu, Anton Ficai, Roxana Trusca i Ligian Tudoroiu. "Polypropylene/Polyamide/Carbon Fibres Nanocomposites: Processing – Morphology – Property Relationships". W The 4th World Congress on New Technologies. Avestia Publishing, 2018. http://dx.doi.org/10.11159/icnfa18.134.

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Bendjillali, Khadra, Mourad Hadjoudja i Mohamed Chemrouk. "Utilizing recycled polypropylene fibres as reinforcement for concrete beams". W The International Conference on Civil Infrastructure and Construction. Qatar University Press, 2020. http://dx.doi.org/10.29117/cic.2020.0108.

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Ramkumar, S. "Shear Behaviour of Fiber Reinforced Concrete Beams Using Steel and Polypropylene Fiber". W Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-21.

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Abstract. The experimental study provides a series of tests for characterizing the structural behavior of fibre reinforced concrete beams subjected to shear loads. The paper involves usage of 2 types of fibers - polypropylene and steel fiber. The work suggests that the shear cracking resistance of the materials used are significantly improved by the fibers. The fibers reduced the crack width to about one quarter of the width in the shear-reinforced girders. Reliance on steel fibres increases the ductility of concrete. Adding steel fibres to concrete improves its post-tensile cracking behaviour. Shear strength is increased with the increase in fiber aspect ratio and fiber volume fraction. The concrete beams are casted for the size of 150 mm x 250 mm x 2100 mm. The behavior of fiber reinforced concrete beams for the addition of 0.4 percentage of fibers in both PFRC and SFRC under loading condition were observed and the load carrying capacity was increased compared to reinforced concrete.

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Kurup, G. Surya Narayana, Sona P. S., Luthfa U, Varsha Manu i Amal Azad Sahib. "Undrained Strength Characteristics of Fibre Reinforced Expansive Soils". W International Web Conference in Civil Engineering for a Sustainable Planet. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.112.19.

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Expansive soils are those whose volume changes take place while it comes in contact with water. It expands during rainy season due to intake of water and shrinks during summer season. Expansive soils owe their characteristics due to the presence of swelling clay minerals. Expansive soils cover nearly 20% of landmass in India and include almost the entire Deccan plateau, western Madhya Pradesh, parts of Gujarat, Uttar Pradesh, Andhra Pradesh, Karnataka and Maharashtra. The properties that describe the expansive behaviour of soils are free swell index, swell potential and swell pressure. This behaviour has an impounding effect on the bearing capacity and strength of foundation lying on such a soil. Some of the stabilization techniques which are currently being used are physical alternations, sand cushioning, belled piers, under reamed piers, granular pile anchors, chemical stabilization, and fibre reinforcement techniques. This paper focuses on improvement in the strength characteristics of stabilized Chittur soil. The commonly used stabilizer for expansive soils is lime. This paper looks upon alternative materials such as fly ash and polypropylene fibres in order to reduce the lime content. It was concluded from the trials that an optimum combination of 1.5% lime, 10% fly ash and 0.2% polypropylene fibres contribut

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Usman, Fathoni, Syazwan Shaharuddin, Noor Mahmudah i Monita Olivia. "Effect of Adding Polypropylene Fibres to Flexural Strength of Ferrocement". W Proceedings of the Third International Conference on Sustainable Innovation 2019 – Technology and Engineering (IcoSITE 2019). Paris, France: Atlantis Press, 2019. http://dx.doi.org/10.2991/icosite-19.2019.8.

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