Interface and mechanical coupling effects in model particulate composites

Albérola, N.; Mélé, P.

doi:10.1002/pen.11819

Cited by 28 publications

(13 citation statements)

References 30 publications

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“…An increase in particle size and content results in the reduction of debonding stress due to the formation of micropores. The amount of debonded particles in the matrix, which determines the pore concentration, is a function of particle diameter; the higher the particle diameter, the lower the debonding stress 34. For these materials, failure occurs immediately following the onset of debonding, and the tensile strength equals the minimum debonding stress 32.…”

Section: Resultsmentioning

confidence: 99%

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Correlo

Boesel

Bhattacharya

et al. 2005

Macro Materials & Eng

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Summary: Hydroxyapatite, chitosan, and aliphatic polyester were compounded using a twin‐screw extruder. The polyesters include poly(ε‐caprolactone) (PCL), poly(lactic acid) , poly(butylene succinate) (PBS), and poly(butylene terephthalate adipate). The mass fraction of chitosan ranged from 17.5 to 45%, while that of HA ranged from 10 to 30%. These blends were injection molded and evaluated for thermal, morphological, and mechanical properties. The addition of hydroxyapatite decreased the crystallinity in chitosan/PBS blends, while in blends containing chitosan/PCL, the crystallinity increased. Addition of hydroxyapatite significantly decreased the tensile strength and elongation of polyester/hydroxyapatite composites as well as chitosan/polyester/hydroxyapatite composites with elongations undergoing decreases over an order of magnitude. The tensile strength of the composite was dictated by the adhesion of HA to the chitosan/polyester matrix. The tensile strength of composites containing hydroxyapatite could be predicted using the Nicolai and Narkis equation for weak filler adhesion (K ≈ 1.21). Tensile‐fractured and cryogenically‐fractured surface indicates extensive debonding of hydroxyapatite crystals from the matrix, indicating weak adhesion. The adhesion of hydroxyapatite was higher for pure polyester than those containing chitosan and polyester. The modulus of the composites registered modest increase. The two main diffraction peaks observed using WAXS are unaffected by the amount of chitosan or hydroxyapatite. magnified image

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Section: Resultsmentioning

confidence: 99%

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Correlo

Boesel

Bhattacharya

et al. 2005

Macro Materials & Eng

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“…It has been reported that the variations of maximum of tan δ in the α-relaxation region could be clearly detected in samples with different fibre surface treatment [17]. In glass-based composites, decreases in tan δ have been attributed to chemical bonding of sizing agents to both matrix and reinforcement.…”

Section: Dynamic Mechanical Analysismentioning

confidence: 93%

“…Results of using the DMA technique to characterise interfacial effects in particulate and fibre-reinforced polymer composites have been reported in the literature [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Most of the studies were carried out in temperature sweeps at fixed frequencies (isochronal conditions) near transition regions of the matrix, specially covering the glass transition region.…”

Section: Introductionmentioning

confidence: 99%

Interfacial studies of carbon fibre / polycarbonate composites using dynamic mechanical analysis

Paiva

Mano

2005

E-Polymers

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Unidirectional composite material samples with ultrahigh modulus carbon fibres, treated and untreated by oxygen plasma, and a polycarbonate matrix were prepared and tested. Dynamic mechanical analysis (DMA) was used to study interfacial fibre/matrix interaction and the fragmentation test method was applied to determine interfacial shear strength. For the composite samples with treated carbon fibres, analyzed by DMA, a consistent shift of the loss modulus peak toward higher temperature was observed. The damping ratio was highly affected by residual stresses along the carbon fibre direction due to the large difference of thermal expansion coefficients of matrix and fibres. Critical fibre length and interfacial shear strength, obtained from the fragmentation test, showed substantial improvement for treated fibres as compared to the untreated ones. Plasma oxidation of the fibre surface improved considerably the fibre-matrix interaction. Care must be taken interpreting the DMA results, due to specific characteristics of the system studied.

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“…Although fillers are used mostly to reduce costs, some mechanical properties, such as the modulus, yield strength, and tensile strength can increase. However, the toughness decreases and the rigidity increases in polypropylene, just as they do in plastics containing mineral fillers 1, 2, 6–10…”

Section: Introductionmentioning

confidence: 99%

“…Polymer blends reinforced with glass fiber have higher strength and rigidity. Particle‐filled polypropylene blends are generally used in engineering applications for which high‐strength properties are not required 6–18…”

Section: Introductionmentioning

confidence: 99%

Effect of calcium carbonate on the mechanical and thermal properties of isotactic polypropylene/ethylene vinyl acetate blends

Öksüz

Yıldırım

2005

J of Applied Polymer Sci

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ABSTRACT:The effect of calcium carbonate (CaCO 3 ) on the mechanical properties (with heat treatment) and thermal properties of polypropylene and isotactic polypropylene (i-PP)/ethylene vinyl acetate (EVA) blends was investigated. CaCO 3 , in five different concentrations (3, 6, 9, 12l, and 15 wt %), was added to i-PP/EVA (88/12) to produce ternary composites. The mechanical properties, including the yield and tensile strengths, elastic modulus, Izod impact strength for notch radii of 0.25 and 1 mm, and hardness with and without an annealing heat treatment, and the thermal properties, such as the melting point and melt-flow index, of the composites were investigated. The annealing heat treatment was carried out at 100°C for three different holding times: 75, 100, and 150 h. On the basis of the results, attempts were made to establish a relationship between the CaCO 3 content, the annealing holding time, and the mechanical and thermal properties to obtain the best results. The tensile test results showed that the heat treatment was not effective for the ultimate tensile strength, and the yield strength and tensile strength decreased gradually as the CaCO 3 content increased. However, CaCO 3 was effective for higher elastic modulus, impact strength, and hardness values. A considerable increase in the elastic modulus was found with a 3% CaCO 3 concentration for a holding time of 100 h. The maximum impact strength for a notch radius of 1 mm was obtained with 3% CaCO 3 with annealing for a holding time of 100 h, whereas a 9% CaCO 3 concentration produced higher toughness values for a notch radius of 0.25 mm. The fracture surfaces also supported the results from the Izod impact tests. Similarly, hardness values increased with the annealing heat treatment and increasing CaCO 3 content. However, different holding times showed similar effects on the hardness values. The increased CaCO 3 content caused the melting point to increase 5°C, whereas the melt-flow index showed a sharp decrease as the CaCO 3 content increased to 3%. Taking into consideration the mechanical and thermal properties and the annealing holding time, we recommend a CaCO 3 concentration of 3% with an annealing heat treatment for 100 h for optimum properties of such ternary composites.

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Interface and mechanical coupling effects in model particulate composites

Cited by 28 publications

References 30 publications

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Interfacial studies of carbon fibre / polycarbonate composites using dynamic mechanical analysis

Effect of calcium carbonate on the mechanical and thermal properties of isotactic polypropylene/ethylene vinyl acetate blends

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