Polypropylene Fibers
Mostrando 25-36 de 56 artigos, teses e dissertações.
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25. Strategies to improve the mechanical properties of starch-based materials: plasticization and natural fibers reinforcement
Biodegradable polymers are starting to be introduced as raw materials in the food-packaging market. Nevertheless, their price is very high. Starch, a fully biodegradable and bioderived polymer is a very interesting alternative due to its very low price. However, the use of starch as the polymer matrix for the production of rigid food packaging, such as trays
Polímeros. Publicado em: 20/05/2014
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26. Prediction of combined effects of fibers and nanosilica on the mechanical properties of self-compacting concrete using artificial neural network
In this research, the combined effect of nano-silica particles and three fiber types (steel, polypropylene and glass) on the mechanical properties (compressive, tensile and flexural strength) of reinforced self-compacting concrete(SCC) is evaluated. For this purpose, 70 mixtures in A, B, C, D, E, F and G series representing 0, 1, 2, 3, 4, 5 and 6 percent of
Lat. Am. j. solids struct.. Publicado em: 2014
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27. Mechanical properties, morphology and thermal degradation of a biocomposite of polypropylene and curaua fibers: coupling agent effect
Biocomposites of polymers with vegetal fibers have a broad spectrum of applications due to their high specific properties in comparison to their counterparts made with fiberglass. Polypropylene, PP, composites with curaua fiber compatibilized with different concentrations of maleic anhydride grafted polypropylene, PP-g-MA, were characterized according to the
Polímeros. Publicado em: 05/04/2013
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28. Rutting prediction of asphalt mixtures modified by polypropylene fibers via repeated creep testing by utilising genetic programming
A novel application of genetic programming (GP) for modelling and presenting closed form solutions to the rutting prediction for polypropylene (PP) modified asphalt mixtures is investigated. Various PP fibers have been utilised for bitumen modification and repeated creep (RC) tests have been carried out. Marshall specimens, fabricated with multifilament 3 mm
Mat. Res.. Publicado em: 01/02/2013
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29. Effect of copaiba oil on correction of abdominal wall defect treated with the use of polypropylene/polyglecaprone mesh
PURPOSE: To evaluate the effects of copaiba oil on the correction of abdominal defect treated with the use of polypropylene/polyglecaprone mesh in rats. METHODS: A defect in the abdominal wall was created and corrected with polypropylene/polyglecaprone mesh in 36 rats. They were randomly distributed into three groups: control, copaiba by oral administration
Acta Cir. Bras.. Publicado em: 2013-02
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30. Fratura do concreto reforçado com fibras de aço e de polipropileno em meios normal e agressivo / Fracture of concrete reinforeced with steel fibers and polypropylene in normal and aggressive environment
O concreto convencional, não armado, apesar de suas vantagens é frágil, detendo reduzida resistência a deformações e baixa capacidade de suportar cargas de tração. A forma de atenuar esses inconvenientes pode ser a introdução de fibras descontínuas para melhorar este comportamento. Assim, quando o concreto é reforçado com fibras tende a melhorar
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/06/2012
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31. Effect of hot drawing process on physical and thermal properties of polypropylene fiber containing selective peroxide and comparison with conventional polypropylene fibers
In this research, the effect of the drawing process on the physical and thermal properties of commercially available polypropylene fiber containing selective peroxide was studied. Attempts have also been made to compare this drawn fiber sample with conventional polypropylene fibers produced from reactor and with controlled rheology grades. The results showed
Polímeros. Publicado em: 09/11/2012
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32. Utilising neural networks and closed form solutions to determine static creep behaviour and optimal polypropylene amount in bituminous mixtures
The testing procedure in order to determine the precise mechanical testing results in Marshall design is very time consuming. Also, the physical properties of the asphalt samples are obtained by further calculations. Therefore if the researchers can obtain the stability and flow values of a standard mixture with the help of mechanical testing, the rest of th
Mat. Res.. Publicado em: 25/09/2012
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33. Efeito da incorporação de fibras curtas de sílica amorfa em compósitos de polipropileno utilizados pela indústria automotiva nacional. / Effect of the incorporation of short amorphous silica fibers in polypropylene composites used by the national automotive industry.
The addition of silica fibers in polypropylene (PP) composites was investigated on this work as a proposal to develop new materials used in automotive industry, in order to enable the reduction of vehicle weight and the resulting fuel economy. The fibers are lightweight, made of amorphous silica and treated with amine silane for better interaction with the p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/06/2011
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34. Polypropylene matrix composites reinforced with coconut fibers
Polypropylene matrix composites reinforced with treated coconut fibers were produced. Fibers chemically treated (alkalization-CCUV samples) or mechanically treated (ultrasonic shockwave-CMUV samples) were dried using UV radiation. The goal was to combine low cost and eco-friendly treatments to improve fiber-matrix adhesion. Composite samples containing up to
Materials Research. Publicado em: 26/08/2011
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35. Ensaios de placa em areia não saturada reforçada com fibras / Plate load tests on fiber-reinforced unsaturated sands
O objetivo do presente trabalho foi estudar o comportamento mecânico de uma areia não saturada, com e sem reforço de fibras, através de ensaios de placa realizados em densidade relativa de 50% e 90%. Para o reforço da areia foi acrescentada a quantidade de 0,5% de fibra de polipropileno em relação ao peso seco de solo. A análise dos resultados dos en
Publicado em: 2011
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36. Investigação do comportamento de Engineered Cementitious Composites reforçados com fibras de polipropileno como material para recapeamento de pavimentos / Investigating polypropylene fiber reinforced engineered cementitious composites as a pavement overlay material
Uma parcela substancial das rodovias do país apresenta processos de deterioração graves de seus pavimentos, fato que acarreta sérios impactos econômicos, sociais e ambientais, resultando em aumento do consumo de combustível, dos gastos com manutenção dos veículos, da frequência de engarrafamentos e do tempo gasto em deslocamentos. A utilização de
Publicado em: 2011