Effect of the silicone interlayer on mechanical properties of carbon fiber reinforced PMR-15 polyimide composites

Labronici, Marcos; Ishida, Hatsuo

doi:10.1163/156855497x00082

Cited by 11 publications

(24 citation statements)

References 14 publications

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“…It depends on the type and strength of the interaction and values from 10 Å to several microns have been reported in the literature for the most diverse systems [52,135,[199][200][201][202][203][204][205][206][207][208]. Since interphase thickness is calculated or deduced indirectly from measured quantities, it depends also on the method of determination.…”

Section: Interphase Formationmentioning

confidence: 99%

Particulate Fillers in Thermoplastics

Móczó

Pukánszky

2017

Fillers for Polymer Applications

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The characteristics of particulate filled thermoplastics are determined by four factors: component properties, composition, structure and interfacial interactions. The most important filler characteristics are particle size, size distribution, specific surface area and particle shape, while the main matrix property is stiffness. Segregation, aggregation and the orientation of anisotropic particles determine structure. Interfacial interactions lead to the formation of a stiff interphase considerably influencing properties. Interactions are changed by surface modification, which must be always system specific and selected according to its 2 goal. Under the effect of external load inhomogeneous stress distribution develops around heterogeneities, which initiate local micromechanical deformation processes determining the macroscopic properties of the composites. INTRODUCTUIONParticulate filled polymers are used in very large quantities in all kinds of applications. The total consumption of fillers in Europe alone is currently estimated as 4.8 million tons (Table 1) [6]. In spite of the overwhelming interest in nanocomposites, biomaterials and natural fiber reinforced composites, considerable research and development is done on particulate filled polymers even today. The reason for the continuing interest in traditional composites lays, among others, in the changed role of particulate fillers. In the early days fillers were added to the polymer to decrease price.However, the ever increasing technical and aesthetical requirements as well as soaring material and compounding costs require the utilization of all possible advantages of fillers.Fillers increase stiffness and heat deflection temperature, decrease shrinkage and improve the appearance of the composites [9][10][11][12][13]. Productivity can be also increased in most thermoplastic processing technologies due to their decreased specific heat and increased heat conductivity [9,10,[14][15][16][17]. Fillers are very often introduced into the polymer to create new functional properties not possessed by the matrix polymer at all like flame retardancy or conductivity [18][19][20][21]. Another reason for the considerable research activity is that new fillers and reinforcements emerge continuously among others layered silicates [7,[22][23][24][25][26][27][28][29], wood flour [30][31][32][33][34][35][36][37], sepiolite [38][39][40][41][42][43][44][45][46][47][48][49], etc.The properties of all heterogeneous polymer systems are determined by the same four factors: component properties, composition, structure and interfacial interactions [9,50]. Although certain fillers and reinforcements including layered silicates, other nanofillers, or natural fibers possess special characteristics, the effect of these four factors is universal and valid for all particulate filled materials. As a consequence, in this paper 3 we focus our attention on them and discuss the most important theoretical and practical aspects of composite preparation and use accordingly. The general rules of h...

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Section: Interphase Formationmentioning

confidence: 99%

Particulate Fillers in Thermoplastics

Móczó

Pukánszky

2017

Fillers for Polymer Applications

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“…Dabei hat, wie bereits beschrieben 14) , die Grenzschichtdicke einen wesentlichen Einfluß auf die Effizienz dieser Behandlung, die im wesentlichen von der Viskosität der Applikationslösung 13,14) bestimmt wird. Im Unterschied zu Rovings aus konventionellen Fasern lassen sich bei Naturfaservliesen diese Grenzschichtdicken nur sehr schwierig und ungenau bestimmen 14) .…”

Section: Energieabsorbierende (Weak') Interphaseunclassified

“…Bei genauerer Betrachtung der Ergebnisse und der Erkenntnisse nach 14) zeigt sich allerdings, daß sich bei dünnen Grenzschichten (max. 20 Gew.-% Kautschuk) Zähigkeits-steigerungen bei nahezu konstanter Festigkeit erzielen lassen, ähnlich wie auch bei Ishida 12,13) für konventionell verstärkte Kunststoffe beschrieben.…”

Section: Energieabsorbierende (Weak') Interphaseunclassified

“…Die Qualität der Faser-Matrix-Anbindung entscheidet dann in der Phase des Rißwachstums auch über den Rißverlauf, d. h. ,crack-bridging' oder ,debonding', und die dafür notwendige Energie [15][16] . Wie an [0, 90] s glasfaserverstärkten EP-Modellverbunden bekannt 17) , kann dieses Schädigungsverhalten, neben der Ä nderung des dynamischen Moduls 16) [12][13][14] , wie in Abb. 5 für Flachs-PUR-Verbunde anhand der Biegefestigkeit und -steifigkeit über die Schlagzähigkeit dargestellt ist.…”

Section: Ermüdungsverhalten Unter Schwingender Beanspruchungunclassified

“…40 -50% gegenüber den Verbunden mit unbehandelten Fasern zu, ohne Einbußen in der Verbundsteifigkeit. Gleiches stellten Labronici et al 13) bei CFaser-Polyimid-Verbunden fest, bei denen bis zu einer Grenzschichtdicke von 280 nm die Schlagzähigkeit zunimmt, der Biege-E-Modul allerdings konstant bleibt. Zur Steigerung der Verbundschlagzähigkeit wurden weiterhin Flachs-PUR-Verbunde mit einer energieabsorbierenden Grenzschicht entwickelt.…”

Section: Ermüdungsverhalten Unter Schwingender Beanspruchungunclassified

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Möglichkeiten zur Kontrolle der Festigkeit und Impactzähigkeit in naturfaserverstärkten Kunststoffen

Gassan

Błędzki²

1999

Angew. Makromol. Chem.

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Die mechanischen Eigenschaften faserverstärkter Kunststoffe werden u. a. wesentlich durch die Grenzfläche/Grenzschicht zwischen Faser und Matrix bestimmt. Vor diesem Hintergrund beschreibt und diskutiert dieser Beitrag wie durch eine gezielte Haftvermittlerapplikation sowie durch den Einsatz einer energieabsorbierenden Grenzschicht die Festigkeit und Zähigkeit naturfaserverstärkter Polyurethane kontrolliert werden kann. Maximale Festigkeitssteigerungen von bis 35% konnten durch den Silanhaftvermittler erzielt werden, die Verbundschlagzähigkeit konnte hingegen durch die energieabsorbierende Grenzschicht um bis zu 100% gesteigert werden. Weiterhin wurde eine lineare Abnahme der Verbundbiegefestigkeit mit zunehmender Verbundschlagzähigkeit ermittelt. REM‐Untersuchungen an Bruchflächen zeigten, daß der Einsatz des Haftvermittlers vermehrt zu kohäsiven Schädigungen der Faseroberfläche führt, hingegen die Verbunde mit energieabsorbierender Grenzschicht deutliche plastische Deformationen dieser Schicht aufweisen.

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Mechanical properties of glass fabric/polyester composites: Effect of silicone coatings on the fabrics

Pavlidou

Mai

Zorbas

et al. 2003

J of Applied Polymer Sci

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An experimental investigation was carried out to study the effect of a silicone coating on the mechanical properties of polyester/woven glass fabric composites, fabricated by resin transfer molding. E-glass woven fabrics were coated with a silicone elastomer by solution dip coating. The effect of variation of silicone amounts on the impact resistance, toughness, and mechanical properties of the composite was determined. Short beam shear tests were performed to assess the effect of coating on the adhesion of the fiber to the matrix. The coated specimens exhibited worse interlaminar shear strength over that of uncoated fabrics. Three-point bending tests were also performed to investigate the effect of the coating on flexural properties. Whereas flexural strength and Young's modulus decreased with increasing amount of coating, the toughness, represented by the area under the stress-strain curve, presented a maximum. Finally, notched Izod impact tests were carried out and the curve for the energy absorbed during impact versus the amount of coating also appeared to have a maximum, indicating an interesting slot for optimum impact performance.

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Effect of the silicone interlayer on mechanical properties of carbon fiber reinforced PMR-15 polyimide composites

Cited by 11 publications

References 14 publications

Particulate Fillers in Thermoplastics

Particulate Fillers in Thermoplastics

Möglichkeiten zur Kontrolle der Festigkeit und Impactzähigkeit in naturfaserverstärkten Kunststoffen

Mechanical properties of glass fabric/polyester composites: Effect of silicone coatings on the fabrics

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