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Mechanical Properties of Polymers and Composites
14 Dec 1993-
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 this article, the influence of the filler content on the mechanical properties of an epoxy resin composite filled with aluminum powder was investigated and the response of the composites was also studied by positron annihilation lifetime spectroscopy.
46 citations
Cites background from "Mechanical Properties of Polymers a..."
...These internal stresses in the compound have a strong influence on the mechanical behavior of the material and depend on the cure process, filler type, shape, content and dispersion [1–6]....
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...In the literature several models explaining the yield stress behavior have been presented [5,7–9]....
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TL;DR: In this article, the authors investigated the mechanisms of the crystal transition in poly(tetramethylene succinate) by FT-IR and X-ray diffraction, and concluded that the thermodynamic first-order phase transition was the operative mechanism of the transition.
Abstract: Poly(tetramethylene succinate) (PTMS) showed a crystal transition between the α (T7GT G) and β (T10) form under the strain and relaxation conditions, where T, G, and G denoted trans, gauche, and minus gauche, respectively. We have investigated the mechanisms of this crystal transition by FT-IR and X-ray diffraction. In the FT-IR, the absorbance peaks at 920 cm−1 and 955 cm−1, corresponding to the α form, started decreasing at strain of e∼8%, while the absorbance at 977 cm−1, corresponding to the β form, appeared at e∼8%, then increased with strain. In addition, the isobestic point was observed at 965 cm−1, indicating that the crystal transition occurred only between the α and β form, where no amorphous part contributed. In the X-ray diffraction, the meridional reflection of α (at 2θ=25.1°) started decreasing at e∼8%. In addition, the reflection of β (at 2θ=22.5°) appeared at e∼8%, then increased with e. These FT-IR and X-ray results were thus consistent with each other. The molar fraction of the β form, χβ, was determined as a function of stress, σ, by X-ray. The χβ showed a drastic increase at a critical value of σ=140 MPa. It was hence concluded that the thermodynamic first-order phase transition was the operative mechanism of the transition. Such a crystal transition mechanism had been also reported in poly(butylene terephthalate) (PBT). The free energy difference between the α and β form, ΔG, was determined to be ΔG∼1.6 (kJ mol−1 of monomer unit), being close to the reported value of ΔG∼1.4 (kJ mol−1 of monomer unit) for the crystal transition in PBT. The stress–strain curve was measured. The σ increased with e when e 16%. Such a stress–strain characteristics could be explained in terms of the crystal transition.
46 citations
TL;DR: In this article, the authors proposed a reduced number of material coefficients, which allowed the specification of the viscoelastic constitutive relationships for a transversely isotropic material, based on only five independent dynamic stiffness parameters and three independent damping loss factors.
Abstract: Understanding and designing for damping in composite laminates has become a topic of great interest; unfortunately, only limited viscoelastic property data is presently available. Direct experimental measurement of the three-dimensional viscoelastic properties is not simple to implement and, thus, an approach leading to the complete 3-D viscoelastic characterization using a reduced number of measured parameters is desirable. To address the difficulties related to direct measurement of properties, this work proposes a reduced number of material coefficients, which allow the specification of the viscoelastic constitutive relationships for a transversely isotropic material, based on only five independent dynamic stiffness parameters and three independent damping loss factors. Further, using this model, a method is developed, based on energy equations, which allows the viscoelastic properties to be evaluated from experimental data, collected from three bend-beam oscillatory tests and two measured Poisson’s ra...
45 citations
TL;DR: In this paper, a non-aqueous sol-gel process was used for the generation of nanosilica from tetraethoxysilane with borontrifluoride monoethylamine (BF3MEA).
45 citations
TL;DR: In this paper, the compatibility behavior of melt-mixed blends of poly(ethylene-co-vinyl alcohol) (EVOH)/ionomer was studied in the complete composition range using tensile, dynamic mechanical, thermal, spectroscopic and morphology characterization techniques.
45 citations