Effect of the incorporation of a novel natural inorganic short fiber on the properties of polyurethane composites

Saliba, Clémenceau Chiabi; Oréfice, Rodrigo Lambert; Carneiro, José Rubens Gonçalves; Duarte, Alamar Kasan; Schneider, Walter Toledo; Fernandes, Manoel Robério Ferreira

doi:10.1016/j.polymertesting.2005.07.008

Cited by 44 publications

(21 citation statements)

References 9 publications

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“…b) indicated that the cracks were generated and propagated within the matrix in a brittle fashion. Fiber pull‐out and bridging was also found in the fracture surface, indicating intermediate levels of adhesion between the fiber and the matrix . The incorporation of NS in the PUI matrix caused a substantial change of the fracture surface of the CF(PUI) reinforced at any NS weight percent.…”

Section: Resultsmentioning

confidence: 99%

Enhanced fracture toughness of nanostructured carbon‐fiber reinforced poly(urethane‐isocyanurate) composites at low concentrations

Chiacchiarelli

Petrucci

Torre

2017

Polymer Engineering & Sci

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Carbon fiber reinforced poly(urethane‐isocyanurate)‐nanosilica composites CF‐(PUI‐NS) were manufactured by means of the vacuum‐assisted resin transfer moulding technique (VARTM) at very low NS concentrations (0–4 wt%). The high strain to failure of the PUI matrix (>7%) affected tensile tests by CF reorientation. Both the tensile strength and strain to failure were highly dependent on its kinematics. CF(PUI‐NS) caused an increase of the static toughness with a maximum improvement of tensile strain to failure and modulus of +28.8% and +39% at 1 wt% and 2 wt% of NS, respectively. The interlaminar shear strength (GIC) of the composites showed both a deterioration of −12.9% and an improvement of +9.9% for NS concentrations of 1 wt% and 4 wt%, respectively. Regardless of the GIC value, all of the composites prepared with NS presented secondary maxima of the force versus displacement plots, indicating a substantial arrest of the crack propagation velocity after delamination started. Fractographic analysis revealed several features, such as fiber pull‐out, bridging as well as river patterns whereas the composites prepared with NS behaved in a more ductile fashion due to the presence of river patterns and a reduced fiber pull‐out. POLYM. ENG. SCI., 58:1241–1250, 2018. © 2017 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Enhanced fracture toughness of nanostructured carbon‐fiber reinforced poly(urethane‐isocyanurate) composites at low concentrations

Chiacchiarelli

Petrucci

Torre

2017

Polymer Engineering & Sci

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“…O valor da tensão na ruptura passou de 50 para 54 MPa, utilizando-se, como agente de reforço, 6 % em volume de fibras tratadas superficialmente (FNSA-AS) em relação às FNSA não tratadas. Conforme descrito na literatura, o tratamento das fibras com aminossilano promove uma interação interfacial, resultando em uma maior transferência de tensão da matriz para a fibra e uma maior resistência à tração [1, 7,8]. A diferença entre os valores da tensão na ruptura foi reduzida para percentagem, em volume de fibra, de 17,5 %.…”

Section: Caracterização Dos Compósitos De Resina Epóxi Reforçados Comunclassified

Estudo da viabilidade de utilização de fibras naturais curtas em matrizes de resina epóxi

et al. 2008

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RESUMOFibras curtas de origem mineral, constituídas, predominantemente, de sílica amorfa, foram caracterizadas e avaliadas quanto a sua viabilidade de utilização como agente de reforço em matrizes de resina epóxi. As fibras naturais de sílica amorfa, denotadas por FNSA, foram incorporadas em matrizes de resina epóxi e as propriedades mecânicas avaliadas através de ensaios de tração. Foi estudada a influência do tratamento superficial da FNSA com agente aminossilano (AS), nas propriedades micro e macroscópicas dos compósitos, e comparado o comportamento mecânico dos compósitos obtidos com fibras naturais de sílica amorfa e fibras de vidro moídas (FV) comerciais. Os resultados sugerem que as fibras de sílica amorfa podem substituir fibras de vidro moídas, as quais vêm sendo utilizadas como agente de reforço em matriz de resina epóxi, uma vez que as propriedades mecânicas dos compósitos foram comparáveis ou superiores aos compósitos reforçados com fibras de vidro moídas.Palavras-chaves: fibras naturais de sílica amorfa, fibra de vidro, resina epóxi, compósitos. Properties of natural amorphous silica fibers as epoxy resin reinforcementABSTRACT A novel kind of short natural fiber obtained from mineral resources, which consists mainly of pure amorphous SiO 2 , was characterized and applied as a reinforcing agent in epoxy resin. Natural amorphous silica fibers (NASF) were incorporated in epoxy resin and the obtained composites were mechanically tested. The effect of the treatment of NASF chemically modified with aminosilane as well as the aspect ratio of the fibers on the mechanical properties of the composite were evaluated and compared with properties obtained with FNSA without treatment. The results obtained show that these natural fibers are potential candidates for the substitution of short glass fibers as a reinforcement phase in polymer composites, since the mechanical properties obtained were in all cases similar or superior to the ones obtained with commercial short glass fibers.Keywords: natural amorphous silica fibers, epoxy resin, short glass fiber, polymer composites. INTRODUÇÃOO desenvolvimento de novos processos, buscando a obtenção de materiais com aplicações específicas, tem sido de grande interesse, nos últimos anos. Os materiais poliméricos vêm ocupando um espaço cada vez maior nos setores tecnológicos, pela possibilidade de substituição aos materiais convencionais, tais como: metais, madeira e vidro. Entretanto, a aplicação de alguns polímeros fica limitada pelas características e desempenho mecânico, tais como baixa resistência ao impacto, à tração e à fadiga, estabilidade dimensional e resistência à abrasão. A adição de aditivos ou fibras de diferentes fontes tem sido uma alternativa para a obtenção de materiais com propriedades específicas e diferentes dos componentes puros. As propriedades de polímeros reforçados com fibras são dependentes da proporção dos constituintes da mistura e da geometria da fase dispersa, bem como da distribuição, comprimento, orientação e forma das

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“…In general, industries that produce flexible polyurethane foams use fillers to modify the material's properties in some way, such as: dimensional stability, retraction from the mold and density [3][4]. When adding filler to a polymer to form a conjugated biphasic material, the tension applied to the polymeric matrix will be transferred in part to the disperse phase, the filler, since it presents properties superior to the pure polymer [5].…”

Section: Introductionmentioning

confidence: 99%

“…Fibres obtained from various parts of the plants are known as vegetable fibres [2]. Natural fibre composites are very cost effective materials, especially in building and construction, packaging, automobile and railway coach interiors and devices [3].…”

Section: Introductionmentioning

confidence: 99%

Effects of Coconut Husk and Corn Cob as Fillers in Flexible Polyurethane Foam

Chris-Okafor¹,

Uchechukwu²,

Nwokoye³

et al. 2017

AJPST

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The effects of local materials as fillers incorporated into the flexible polyether foam recipes were investigated. The fillers; coconut husk and corn cob of mesh sizes of 150 µm respectively were mixed in the ratio of 50:50. Varying percentages of the mixed fillers, 5%, 10%, 15%, 20% and 25% were mixed with polyether foam recipes in the appropriate formulations and physico-mechanical tests were carried out on the samples. Density and compression set showed an increasing trend with increase in the filler. Elongation at break and tensile strength showed a decrease in the value as the filler load was increasing. Hardness showed a slight random variation in the value as the filler load increased. Thermal conductivity also showed a decrease in its value as the filler load increased that means it can serve as a fire retardant. All these properties were compared to a controlled sample (sample without filler). These fillers can be used in the production of polyurethane foams since they are organic materials, thus they can enhance the biodegradability of polyurethane products and be use also as flame retardants.

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Effect of the incorporation of a novel natural inorganic short fiber on the properties of polyurethane composites

Cited by 44 publications

References 9 publications

Enhanced fracture toughness of nanostructured carbon‐fiber reinforced poly(urethane‐isocyanurate) composites at low concentrations

Enhanced fracture toughness of nanostructured carbon‐fiber reinforced poly(urethane‐isocyanurate) composites at low concentrations

Estudo da viabilidade de utilização de fibras naturais curtas em matrizes de resina epóxi

Effects of Coconut Husk and Corn Cob as Fillers in Flexible Polyurethane Foam

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