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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, an attempt is made to review and highlight some recent findings and also some trends to show future directions and opportunities for the development of polymer nanocomposites reinforced with alumina nanoparticles.
Abstract: Polymers and their composites find use in many engineering applications as alternative products to metal-based ones and, nowadays, have wide technical applications. One of the most used composite materials is the epoxy resins (EP), which is a thermoset polymer matrix. After cure, this material displays some excellent mechanical, thermal, electrical and chemical properties. For these reasons, it has been widely used for a wide range of automotive and aerospace applications, as well as for shipbuilding or electronic devices. However, EP has poor resistance to crack propagation and is brittle. So, in recent years, a considerable amount of research has been carried out to improve the performance of the toughness of EP. The most common studied technique consist to reinforce the EP matrix with rigid nanoparticle fillers, such as alumina, silica, mica, talc, organoclays, nanoclays, carbon nanotubes, TiO2, among others. Among these nanofillers type, nanosize alumina particles has not been widely studied. However, recent studies have reported that the use of functionalized nanosize alumina particles as nanofiller can significantly improve the properties of the nanocomposite, even with low contents. These results, combined with the low cost of the alumina, show that the reinforcement of EP with alumina nanoparticles is a viable solution. In this paper, an attempt is made to review and highlight some recent findings and also some trends to show future directions and opportunities for the development of polymer nanocomposites reinforced with alumina nanoparticles.
35 citations
TL;DR: Zhou et al. as mentioned in this paper explored both quasi-static and dynamic conditions of the zeolite β/water system to give insights into its potential as a protection system, including its energy absorption density and its dependence on three influential parameters.
35 citations
TL;DR: In this paper, the macroscopic elastic behavior of hollow microsphere filled composites, collectively known as syntactic foams, was studied using analytical and numerical methods, and the applicability of unit cell FE methods in the estimation of effective elastic properties of the syntactic foam was assessed.
35 citations
01 Mar 1977-Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry
TL;DR: In this article, a quantitative description of the densification process of glasses resulting from glass formation at elevated pressures is given, and the results from different methods are compared for data from 23 different organic polymers with glass transition temperatures ranging from 150 to 455 K.
Abstract: A quantitative description is given for the densification process of glasses resulting from glass formation at elevated pressures. Phenomenological relations are derived, or justified, which allow estimation of the densifica tion rate K' (with respect to formation pressure) from various thermodynamic quantities and glass transition behavior. In addition, the estimation of K' may be facilitated by the application of the hole theory of Simha and Somcynsky. Using these relations K' is estimated, and the results from the different methods are compared for data from 23 different organic polymers with glass transition temperatures ranging from 150 to 455 K. The amount of densification appears to be limited by the apparent convergence of the glass temperature and effective decomposi tion temperature with increasing pressure. Some estimates of limiting values are presented. Finally, changes of refractive index resulting from densification are estimated from the observed, or predicted, densification rates.
35 citations
TL;DR: In this article, the fire retardancy of polypropylene (PP)/thermoplastic polyurethane (TPU)/ammonium polyphosphate (APP) intumescent blends, using TPU with different chemical compositions and structures, is discussed.
Abstract: This work deals with the fire retardancy of polypropylene (PP)/thermoplastic polyurethane (TPU)/ammonium polyphosphate (APP) intumescent blends, using TPU with different chemical compositions and structures. The influence of the chemical nature of the polyol used in the synthesis of the TPU on the fire resistance of materials is discussed. Moreover, smoke production from combustion of the blend and mechanical properties (elongation/stress relation) of the polymeric materials are studied. Improved flame retarded (FR) materials with very different mechanical properties according to the composition of the TPU can be formulated.
35 citations