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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 paper, a polyurea (PU) elastomer was measured at strain rates up to 830 s−1, in combination with ex post facto small-angle X-ray scattering (SAXS) measurements and temperature-dependent SAXS.
Abstract: Extensional stress−strain measurements on a polyurea (PU) were carried out at strain rates up to 830 s−1, in combination with ex post facto small-angle X-ray scattering (SAXS) measurements and temperature-dependent SAXS. The elastomer is of interest because of its application as an impact-resistant coating. The highest strain rates used herein fall within the softening, or transition, zone of the viscoelastic spectrum and are thus relevant to the working hypothesis that the performance of a polyurea impact coating is related to its transition to the glassy state when strained very rapidly. While quasi-static and slow deformation of the PU gives rise to irrecoverable strain and anisotropic SAXS patterns, when stretched at high rates the PU recovers completely and the scattering is isotropic. Thus, the deformation of the hard domains observed at low rates is absent at high strain rates. Linear dynamic mechanical measurements were also carried out, with the obtained segmental relaxation times in good agreeme...
85 citations
TL;DR: In this paper, the effect of particle size and particle/matrix adhesion upon the fracture toughness was investigated using double cantilever beam (DCB) specimens, where the particles were treated with γ-aminopropyl methyldiethoxysilane and hexamethyl disilazane.
85 citations
TL;DR: The dynamic viscoelastic properties of long-term soft denture liners were measured over a wide range of frequencies using a dynamic visCOelastometer based on a non-resonance-forced vibration principle and the acrylic and fluoroelastomer products underwent significant change.
85 citations
15 May 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the creep behavior of biodegradable composites based on starch/polycaprolactone commercial blends reinforced with an organo-modified nanoclay, processed by melt-intercalation was studied.
Abstract: The creep behaviour of biodegradable composites based on starch/polycaprolactone commercial blends reinforced with an organo-modified nanoclay, processed by melt-intercalation was studied. Clay content and temperature effects were also analyzed. The experimental behaviour was correlated with several models. The master curves were built by means of the time–temperature superposition principle. Findley's power law correctly predicted the strain–time curves and also the complete compliance curves. The Burgers's model (four parameters) was also used allowing the relationship between the creep behaviour and the composite morphology. All the results showed that the addition of clay to the neat matrix leads to a significant improvement of creep resistance.
85 citations
TL;DR: Differences in time dependent deformation and recovery as well as dynamic mechanical properties of dental composites were strongly influenced by filler parameter differences.
85 citations