Effect of interfacial silane network structure on interfacial strength in glass fibre composites

Hamada, Hiroyuki; Ikuta, Nobuo; Nishida, N.; Maekawa, Zenichiro

doi:10.1016/0010-4361(94)90178-3

Cited by 52 publications

(36 citation statements)

References 6 publications

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“…If adhesion takes place, the interface must necessarily be controlled. First, because in many cases failure occurs in the interface region due to chemical reaction or plastificatio when impurities (commonly water) penetrate the interface (4-7) and, second, because the properties of composites depend on the ability of the interface to transfer stress from the matrix to the reinforcement (8).…”

Section: Introductionmentioning

confidence: 99%

“…It is quite well known that, because of the chemical and structural differences of this coupling agent interface layer, the mechanical properties of composite materials change greatly (4,8,10,11). To investigate the effect of different treatments on interfacial reinforcement in glass fiber/epox composites, such single filamen tests as the fibe fragmentation test (4,12,13) and the fibe pull-out test (13,14), are commonly used, among others.…”

Section: Introductionmentioning

confidence: 99%

“…Ikuta et al (17) proposed a parameter which they called "interfacial transmissibility" to reveal the transmissibility of tensile force through the silane interface from matrix to glass fibers 1 Using this parameter Hamada et al (8) found that the crosslink of the silane reduces the interfacial strength, and they proposed that it depresses the permeability of the resin and leads to a lowering of the reactivity between the silane and resin.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Glass Fiber Surface Treatments on Mechanical Strength of Epoxy Based Composite Materials

Iglesias

González‐Benito

Aznar

et al. 2002

Journal of Colloid and Interface Science

108

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Sizing glass fibers with silane coupling agents enhances the ad-hesion and the durability of the fiber/polymer matrix interface in composite materials. There are several tests to determine the inter-facial strength between a fiber and resin, but all of them present difficulties in interpreting the results and/or sample preparation. In this study, we observed the influence of different aminosilanes fiber coatings on the resistance of epoxy-based composite materials using a very easy fractographic test. In addition, we tried a new flu-orescence method to get information on a molecular level precisely at the interface. Strength was taken into account from two stand-points: (i) mechanical strength and (ii) the resistance to hydrolysis of the interface in oriented glass-reinforced epoxy-based composi-tes. Three silanes: γ -aminopropyltriethoxysilane, γ -Aminopropyl-methyldiethoxysilane, and γ -Aminopropyldimethylethoxysilane were used to obtain different molecular structures at the interface. It was concluded that: (i) the more accessible amine groups are, the higher the interface rigidity is; (ii) an interpenetrating network mechanism seems to be the most important for adhesion and there-fore to the interfacial strength; and (iii) the higher the degree of crosslinking in the silane coupling layer is, the higher the hydrolytic damage rate is.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Glass Fiber Surface Treatments on Mechanical Strength of Epoxy Based Composite Materials

Iglesias

González‐Benito

Aznar

et al. 2002

Journal of Colloid and Interface Science

108

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“…Glass fibers surfaces treated in such a way become E-type glass fibers are usually employed as reinfunctionalized with amine groups, which may react with forcements in polymer matrix composites. For improving the polymer matrix during the curing stage of the composthe interfacial adhesion, glass fibers are surface treated ite; as a result, the mechanical properties of the composite with coupling agents such as ␥-aminopropyltriethoxysiare greatly enhanced [6,7]. lane (APES), which react with both the glass surface and the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

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González‐Benito

Aznar

Lima³

et al. 2000

Journal of Fluorescence

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E-glass fibers were silanized using a 1% (v/v) aqueous solution of ␥-aminopropyltriethoxysilane (APES). Pyrenesulfonamide conjugates were formed by reaction of 1-pyrenesulfonyl chloride (PSC) in acetonitrile (AcN), with the amine groups immobilized on the glass fiber surface. These pyrene-sulfonamide conjugates were used as fluorescence probes, being a relatively simple analytical method to study the coating microstructure of polyorganosiloxane layer on glass fibers. The first aim of this work was to estimate possible interactions of the polyaminosiloxane coating with surrounding molecules of different solvents (solvent accessibility to the chromophore). For this study, the fluorescence response of pyrene-sulfonamide dye (PSA) was correlated with solvent polarity parameters. It was concluded that all the studied solvents were accessible to the chromophore, and they can gather in two groups, depending on their ability to swell the poliorganosiloxane layer. The second objective was to estimate the rigidity of the coating polymer from the temperature dependence of PSA emission. At about 180 K, a sudden change in the behavior of different photophysical parameters of PSA were observed. This phenomenon was interpreted as a density change in the polyaminosiloxane attached to the glass fibers.

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“…El mecanismo por el que la matriz interacciona con el recubrimiento depende en buena parte de la microestructura de esta región (1,5). Las cadenas de polímero de la matriz deben difundir hacia la interfase y penetrar en ella para que la reacción de acoplamiento con la matriz pueda tener lugar.…”

Section: Introductionunclassified

Transiciones térmicas en recubrimientos polisiloxánicos de fibras de vidrio

González‐Benito¹,

Aznar²,

Macanita³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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INTRODUCCIÓNLos trialcoxisilanos se utilizan frecuentemente como agentes de acoplamiento para fibras de vidrio en materiales compuestos de matriz polimérica. Su presencia mejora la adhesión interfacial entre las fibras reforzantes y la matriz (1-3).Los agentes de acoplamiento en base silano suelen reaccionar mediante condensación con los grupos silanoles superficiales del vidrio formando enlaces siloxánicos Si(sustrato)-OSi(silano). Debido a la geometría molecular de los silanos y al escaso número de silanoles en ciertas superficies silícicas, no es posible la condensación completa con el sustrato y, en su lugar, se produce homocondensación formándose una capa heterogénea de poliorganosiloxano que recubre, con mayor o menor eficacia al vidrio (4). Esta capa recibe el nombre de región de acoplamiento.El mecanismo por el que la matriz interacciona con el recubrimiento depende en buena parte de la microestructura de esta región (1,5). Las cadenas de polímero de la matriz deben difundir hacia la interfase y penetrar en ella para que la reacción de acoplamiento con la matriz pueda tener lugar. El acoplamiento químico en la interfase, la apertura de red y, sobre todo, su flexibilidad son por tanto factores decisivos para que la región de acoplamiento pueda soportar y/o relajar tensiones cortantes interfaciales en el material compuesto (6). Aunque es abundante la literatura científica sobre tipos de silanos y optimización de formulaciones de acoplamiento, no se conocen las propiedades de tales interfases. La mayor parte de los estudios realizados en este campo, basados en la variación de las propiedades mecánicas de los materiales compuestos fibra de vidrio/matriz polimérica, han justificado sus resultados en términos de una mayor o menor accesibilidad por parte de la matriz polimérica a la funcionalidad del silano (5), por ejemplo una mayor penetración del polí-mero en la interfase debe dar lugar a un aumento a la tensión interfacial (5). En cambio, poco se conoce del efecto que produce la variación de la flexibilidad de la región de acoplamiento en dichas propiedades mecánicas. Con objeto de poder correlacionar dichas propiedades, es necesario previamente conocer la rigidez de la región de acoplamiento, aspecto que hasta el momento no está del todo subsanado. Se realizó una estimación de las temperaturas de relajación de recubrimientos poliméricos en fibras de vidrio. Para ello, se llevó a cabo el seguimiento de la respuesta fluorescente, en función de la temperatura, de dos fluoróforos químicamente enlazados al recubrimiento polimérico. Las fibras de vidrio fueron tratadas con una disolución acuosa de 3-aminopropiltrietoxisilano (APES), y una mezcla al 50 % de APES y de 3-aminopropilmetildietoxisilano (APDES). Los marcadores fluorescentes, cloruro de pireno-1-sulfonilo (PSC) y cloruro de 1-dimetilamino-5-naftalenosulfonilo (DNS), se anclaron a las fibras de vidrio silanizadas a través de la formación de un compuesto sulfonamida estable y fluorescente (PSA y DNSA respectivamente). Se realizaron sus espectros de emisi...

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Effect of interfacial silane network structure on interfacial strength in glass fibre composites

Cited by 52 publications

References 6 publications

Effect of Glass Fiber Surface Treatments on Mechanical Strength of Epoxy Based Composite Materials

Effect of Glass Fiber Surface Treatments on Mechanical Strength of Epoxy Based Composite Materials

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Transiciones térmicas en recubrimientos polisiloxánicos de fibras de vidrio

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