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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 crystalline morphology on fatigue crack propagation in a slightly branched polyethylene was investigated and it was shown that larger spherulite size and distribution appeared to have a deleterious effect on fatigue properties.
Abstract: An investigation of the influence of crystalline morphology on fatigue crack propagation (FCP) resistance in a slightly branched polyethylene is presented. Various thermal histories have been utilized to generate samples with different crystalline microstructures and the samples were characterized thoroughly using standard methods. Estimation of tie molecule densities was obtained from measurements of brittle fracture stress. Differences in FCP behaviour for the quenched and annealed samples were shown to be dictated by a competing effect between the degree of crystallinity and tie molecule density. Further, larger spherulite size and distribution appeared to have a deleterious effect on fatigue properties. In general, crystalline microstructure is shown to have a significant influence on fatigue crack propagation behaviour.
36 citations
TL;DR: In this article, graphite nanosheets are used as heterogeneous nucleating agent to facilitate formation of crystal nucleus and also as a physical hindrance to retard crystal growth in biodegradable poly(butylene adipate-co-terephthalate) composites.
36 citations
TL;DR: In this paper, a 1:1 mixture of citric acid and acetaminophen was examined using differential scanning calorimetry and showed no changes in its thermogram after seven weeks of storage at 23°C.
Abstract: Glass dispersion systems were examined using differential scanning calorimetry. The addition of a crystalline additive to a glassy vehicle resulted in a reduction of the vehicle's glass transition temperature. Mixtures of glassy materials were immiscible, partially miscible, or completely miscible. The results can be explained using the concept of miscibility among liquids. By combining two miscible glasses in the proper ratio, it was possible to obtain greater physical stability than with either of its glassy components. This was demonstrated with a 1:1 mixture of citric acid and acetaminophen which showed no changes in its thermogram after seven weeks of storage at 23°C. The glass transition of this mixture is about 18° C.
36 citations
TL;DR: In this article, the mechanical behavior of epoxy matrix composites filled with nanosized silica particles and styrenebutadiene rubber is discussed, and the results of wear test in pin-on-disc mode and hardness test on Rockwell R scale showed that the nano-silica particles could improve the wear resistance of the epoxy matrices even though the content of the filler is at a relatively low level (1.0 wt%).
Abstract: The mechanical behavior of epoxy matrix composites filled with nanosized silica particles and styrenebutadiene rubber is discussed. Scanning electron microscopy analysis and tensile test carried out at different crosshead speeds on the silicastyrenebutadiene rubber epoxy nanocomposites indicated the absence of particle aggregation and a reinforcing effect in terms of increased elastic modulus, yield, and ultimate strength. The results of wear test in pin-on-disc mode and hardness test on Rockwell R scale showed that the nanosized silica particles could improve the wear resistance of the epoxy matrix even though the content of the filler is at a relatively low level (1.02.0 wt%). This makes it possible to develop novel type of epoxy-based material with improved wear resistance for various applications. About 4070% increase in impact strength has been noticed due to addition of 0.51.5 wt% of styrenebutadiene rubber in 1.0 wt% silica-filled epoxy compos- ite. A good correlation between mechanical properties and weight contents of the filler materials, hardness and ultimate strength, and hardness and wear rate has been observed.
36 citations
Cites background from "Mechanical Properties of Polymers a..."
...The final properties of the composite material are affected by several factors, such as intrinsic characteristics of each component, the content, the shape and the dimension of fillers, and the nature of the interface [5]....
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TL;DR: In this paper, an epoxidized natural rubber (ENR) and organoclay nanocomposites (Cloisite 20A) were prepared by solution mixing in the presence of ISAF and SRF types of carbon black as reinforcing fillers.
36 citations