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Dubnikova, I. L.; Oshmyan, V. G.; Gorenberg, A. Ya.

doi:10.1023/a:1018547226983

Cited by 54 publications

(26 citation statements)

References 3 publications

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“…While the pure polyesters underwent plastic deformation, the composites displayed brittle failure. According to Dubnikova et al,32 there is a critical filler volume fraction ( ϕ ) below which the samples deform by necking. Beyond this critical value, there is negligible shrinkage of the cross‐sectional area when deformation occurs.…”

Section: Resultsmentioning

confidence: 99%

“…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. Chitosan/PCL and chitosan/PBS samples with hydroxyapatite displayed a brittle fracture behavior, while chitosan/PBTA with hydroxyapatite displayed a uniform yield.…”

Section: Resultsmentioning

confidence: 99%

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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%

Section: Resultsmentioning

confidence: 99%

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Correlo

Boesel

Bhattacharya

et al. 2005

Macro Materials & Eng

View full text Add to dashboard Cite

show abstract

“…The latter factor is greatly affected by the size of the interface and the strength of the interaction. Surface treatments with different modifiers such as stearic acid, silane and titanate coupling agents have been reported to improve the interface and strength of the interaction between the filler and the matrix [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of surface modification of fly ash on the mechanical, thermal, electrical and morphological properties of polyetheretherketone composites

Parvaiz

Mohanty

Nayak

et al. 2011

Materials Science and Engineering: A

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“…6 Therefore, an increase in the particle size (d) leads to a brittle-ductile transition at small d (d Ͻ d max ) 4,6 and to a ductile-brittle transition at large d (d Ͼ d max ). [5][6][7] It has been shown that the first transition is mostly caused by a drop in the debonding stress ( d ), which provides, in turn, a decrease in the yield stress ( y ). That is why an increasing branch of b -d dependence is qualified as an adhesive factor of rupture.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the system becomes mechanically equivalent to porous media, as it is for rubber-modified polymers, especially in the case of cavitated inclusions. The decreasing character of the b -d dependence is qualified 6 as a geometrical factor of rupture. This phenomenon of a general meaning is the subject of this simulation.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the scale factor of a ductile fracture of polymer blends and composites on the basis of the specific interphase concept

Oshmyan

Shamaev

Timan

2003

J of Applied Polymer Sci

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ABSTRACT:The concept of interfacial layers surrounding inclusions in a host polymer is accepted as a basic source of the scale factor in the simulation of the large-strain deformation and fracture of polymer blends and composites. The essence of the phenomenon is the ductile-brittle transition if the polymer ligament thickness exceeds a critical value, which is determined by the nature of the polymer. Original texture-sensitive constitutive equations have been applied for the simulation of the polymer large-strain deformation. Two periodic structural models of composites have been used. The disperse component (elastomeric or rigid inclusion) has been replaced by a geometrically identical system of pores, which coincides with phenomena of elastomeric inclusion rupture in rubber-toughened plastics and debonding in particulate-filled composites. The local loss of stability of an elastic deformation is used as a composite fracture criterion. The specific properties of the interphase can be caused by a specific texture and by closeness to a free surface. This specificity is stated in the model by an improved plastic ability compared with that of a bulk polymer. Our simulations show that the percolation of an interfacial polymer provides the brittle-ductile transition.

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Cited by 54 publications

References 3 publications

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Hydroxyapatite Reinforced Chitosan and Polyester Blends for Biomedical Applications

Effect of surface modification of fly ash on the mechanical, thermal, electrical and morphological properties of polyetheretherketone composites

Simulation of the scale factor of a ductile fracture of polymer blends and composites on the basis of the specific interphase concept

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