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Mechanical Properties of Polymers and Composites

TL;DR: In this article, the authors discuss various mechanical properties of fiber-filled composites, such as elastic moduli, creep and stress relaxation, and other mechanical properties such as stress-strain behavior and strength.
Abstract: Mechanical Tests and Polymer Transitions * Elastic Moduli * Creep and Stress Relaxation * Dynamical Mechanical Properties * Stress-Strain Behaviour and Strength * Other mechanical Properties * Particulate-Filled Polymers * Fiber- Filled Composites and Other Composites.
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TL;DR: In situ synthesis of silver/epoxy nanocomposites was achieved by UV-induced polymerization through a simultaneous photoinduced electron transfer and cationic polymerization processes as mentioned in this paper.
Abstract: In situ synthesis of silver/epoxy nanocomposites was achieved by UV-induced polymerization through a simultaneous photoinduced electron transfer and cationic polymerization processes The FESEM morphological investigation showed a uniform dispersion of silver nanoparticles within the polymeric matrix having narrow size distribution between 15 and 20 nm The evolution of dielectric properties with frequency and NP content seem to indicate that the nanocomposites of this study remain below the percolation threshold The dielectric spectroscopy results are in good agreement with the morphological investigation, which showed the absence of NPs percolative network

28 citations


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Journal ArticleDOI
TL;DR: In this article, a microscopic and image analysis technique was introduced, whose combination provided two semiquantitative parameters: structure roughness and structure cocontinuity, which was closely associated with the predictive scheme based on the equivalent box model and percolation theory.
Abstract: The RTPP/ABS (rubber toughened polypropylene/poly (acrylonitrile-co-butadiene-co-styrene) blends, both noncompatibilized and compatibilized with polypropylene-g-polystyrene, were prepared by melt mixing in a Brabender Plasti-Corder. As the torque ratio of RTPP and ABS was about 2, phase cocontinuity in the blends was achieved at ABS volume fractions around 0.16, which was evidenced by both microscopic analysis and mechanical testing. A new microscopic and image analysis technique was introduced, whose combination provides two semiquantitative parameters: structure roughness and structure cocontinuity. The latter parameter is closely associated with the predictive scheme based on the equivalent box model and percolation theory, which was used in this study. The predicted mechanical properties were confronted with the experimental data for tensile modulus, yield strength, and tensile impact strength. While the modulus of noncompatibilized blends is reasonably fitted by the model, the compatibilizer accounts for a positive deviation attributed to a strong interaction between the compatibilizer and the matrix. The yield strength of noncompatibilized blends indicates poor interfacial adhesion, which is so enhanced by the compatibilizer that no phase debonding occurs before yielding. Tensile impact strength, in contrast to modulus and yield strength, passes through a deep minimum for both types of blends; two tentative explanations of this detrimental behavior were suggested. POLYM. ENG. SCI., 47:582–592, 2007. © 2007 Society of Plastics Engineers.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the hierarchical structure of the hardwood balsa (Ochroma pyramidale) is modelled sequentially at various length scales to describe the contribution of each to its elastic moduli.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined the high-temperature creep behavior of symmetric angle-ply laminates made of unidirectional T800H/3631 carbon/epoxy composite at relatively high stress levels.

28 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the dynamics of infiltration of a hydrophobic nanoporous body with a nonwetting liquid under rapid compression and found that the infiltration begins and occurs at a new constant pressure independent of the compression energy and viscosity of the liquid.
Abstract: The dynamics of infiltration of a nanoporous body with a nonwetting liquid under rapid compression is studied experimentally and theoretically Experiments are carried out on systems formed by a hydrophobic nanoporous body Libersorb 23, water, and an aqueous solution of CaCl2 at a compression rate of $$ \dot p $$ ≥ 104 atm/s It is found that the infiltration begins and occurs at a new constant pressure independent of the compression energy and viscosity of the liquid The time of infiltration and the filled volume increase with the compression energy A model of infiltration of a nanoporous body with a nonwetting liquid is constructed; using this model, infiltration is described as a spatially nonuniform process with the help of distribution functions for clusters formed by pores accessible to infiltration and filled ones On the basis of the proposed system of kinetic equations for these distribution functions, it is shown that under rapid compression, the infiltration process must occur at a constant pressure p c whose value is controlled by a new infiltration threshold θ c = 028 for the fraction of accessible pores, which is higher than percolation threshold θ c0 = 018 Quantity θ c is a universal characteristic of porous bodies In the range θ c0 < θ < θ c , infiltration of the porous body should not be observed It is shown that the solution to the system of kinetic equations leads to a nonlinear response by the medium to an external action (rapid compression), which means the compensation of this action by percolation of the liquid from clusters of filled pores of finite size to an infinitely large cluster of accessible but unfilled pores As a result of such compensation, infiltration is independent of the viscosity of the liquid It is found that all experimental results can be described quantitatively in the proposed model

28 citations