On stress whitening during surface deformation in clay-containing polymer nanocomposites: A microstructural approach

Hadal, R.; Yuan, Qiang; Jog, J. P.; Misra, R.D.K.

doi:10.1016/j.msea.2005.11.032

Cited by 50 publications

(26 citation statements)

References 39 publications

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“…In fact, the high interface-to-volume ratio of a nanomaterial or nanostructure makes its interface energy comparable to or dominant over its bulk energy. One consequence of this fact is that the overall behaviour of a nanomaterial or nanostructure becomes size-dependent [5,6]. The objective of the present work is twofold.…”

Section: Introductionmentioning

confidence: 99%

An XFEM/level set approach to modelling surface/interface effects and to computing the size-dependent effective properties of nanocomposites

2008

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International audienceIn a nanostructured material, the interface to volume ratio is so high that the interface energy, which is usually negligible with respect to the bulk energy in solid mechanics, can no longer be neglected. The interfaces in a number of nanomaterials can be appropriately characterized by the coherent interface model. According to the latter, the displacement vector field is continuous across an interface in a medium while the traction vector field across the same interface is discontinuous and must satisfy the Laplace-Young equation. The present work aims to elaborate an efficient numerical approach to dealing with the interface effects described by the coherent interface model and to determining the size-dependent effective elastic moduli of nanocomposites. To achieve this twofold objective, a computational technique combining the level set method and the extended finite element method is developed and implemented. The numerical results obtained by the developed computational technique in the two-dimensional context are compared and discussed with respect to the relevant exact analytical solutions used as benchmarks. The computational technique elaborated in the present work is expected to be an efficient tool for evaluating the overall sizedependent elastic behaviour of nanomaterials and nanosized structures

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Section: Introductionmentioning

confidence: 99%

An XFEM/level set approach to modelling surface/interface effects and to computing the size-dependent effective properties of nanocomposites

2008

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“…Experimental investigations have indicated that they exhibit a considerable enhancement of strength, modulus, flame-retardant and heat distortion temperature that are not displayed by the individual phases or by conventional composite counterparts. [1][2][3][4][5][6] Poly(propylene) (PP) exhibits an attractive combination of low cost, low weight, and extraordinary versatility in terms of properties, applications and recyclability. [7] However, due to the low polarity of this resin, it is difficult to get an exfoliated and homogenous dispersion of the clay layer at the nanometer level in the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Comparative Characterization of PP Nano‐ and Microcomposites by In‐Mold Shrinkage Measurements and Structural Characteristics

Revilla-Díaz

Sánchez-Valdés

López-Campos

et al. 2007

Macro Materials & Eng

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Poly(propylene)‐clay nanocomposites and poly(propylene) containing conventional inorganic fillers such as calcium carbonate (CaCO3) and glass fiber were used in a comparative study focusing on dimensional stability, structure, mechanical and thermal properties. Micro‐ and nanocomposites were prepared by melt blending in a twin‐screw extruder. The relative influence of each filler was observed from dimensional stability measurements and structural analysis by WAXD, TEM, and thermal and mechanical properties. At equal filler loadings, PP/clay nanocomposites exhibit an improvement in dimensional stability and were the only composites capable of reduced shrinkage in both in‐flow and cross‐flow directions. The flexural modulus of PP increased nearly 20% by compounding with 4% organoclay, as compared to a similar performance obtained by compounding with 10 wt.‐% of CaCO3 or approximately 6 wt.‐% of glass fiber. The HDT and thermal stability of PP were enhanced by using nanoclay as filler.magnified image

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“…On the other hand, reinforcement effect of rigid fillers improves strength and stiffness of polymer matrix, while ductility of polymer matrix dramatically reduces [16,17]. Rigid fillers restrict plastic deformation by increasing yield stress and modulus resulting in larger elastic regime [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Degree of stress whitening depends on size and density of these defects and stress whitening is only observed if size of defects is in order of wavelength of visible light [20]. Stress whitening may be significantly reduced by incorporating rigid particles in polymer matrix such that plastic deformation is minimized [19,22,25,26,32]. However, inadequate interfacial bonding strength may result in micro-void formation and further enhance stress whitening in particle filled polymers.…”

Section: Introductionmentioning

confidence: 99%

Micro-deformation mechanisms in thermoformed alumina trihydrate reinforced poly(methyl methacrylate)

Gunel

Basaran

2009

Materials Science and Engineering: A

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On stress whitening during surface deformation in clay-containing polymer nanocomposites: A microstructural approach

Cited by 50 publications

References 39 publications

An XFEM/level set approach to modelling surface/interface effects and to computing the size-dependent effective properties of nanocomposites

An XFEM/level set approach to modelling surface/interface effects and to computing the size-dependent effective properties of nanocomposites

Comparative Characterization of PP Nano‐ and Microcomposites by In‐Mold Shrinkage Measurements and Structural Characteristics

Micro-deformation mechanisms in thermoformed alumina trihydrate reinforced poly(methyl methacrylate)

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