Mechanical properties of polymeric

E. A. Meinecke and R. E. Clark, Mechanical Properties of Polymeric Foams, Technomic Publishing Co., Stamford, Coim., 1972. 

In an overwhelming majority of investigations into the effect of fillers on the mechanical properties of polymeric materials (cf., e.g. [234]) it was noted that the... 

When we consider the mechanical properties of polymeric materials, and in particular when we design methods of testing them, the parameters most generally considered are stress, strain, and Young s modulus. Stress is defined as the force applied per unit cross sectional area, and has the basic dimensions of N m in SI units. These units are alternatively combined into the derived unit of Pascals (abbreviated Pa). In practice they are extremely small, so that real materials need to be tested with a very large number of Pa... 

It Is well known that mechanical properties of polymeric materials are greatly deteriorated by UV exposure (2-j)). The nature of this deterioration was determined using non-strained samples which were photooxidized at 37°C. Engineering stress-strain curves as a function of UV exposure are shown in Figure 1. The numbers next to each curve represent days of UV exposure. In terms of degradation, the points of interest are ... 

The space-time resolution of these techniques reveals the molecular motions leading to the viscoelastic and mechanical properties of polymeric systems. This knowledge is of great importance for scientific reasons and is also a basis for the design of tailor-made materials. 

Dynamic properties Mechanical properties of polymeric materials exhibited under repeated cyclic deformation. 

This mechanism appears to be most commonly reported for transition-metal-catalyzed autoxidation of organic substrates. However, at least a few other possibilities exist (23). The effect of oxygen absorption and subsequent oxidation and cleavage of cellulosic chains on the permanence as well as the appearance of paper can be very significant. The absorption of even the smallest amounts of oxygen is known to produce a substantial loss in mechanical properties of polymeric materials. In the case of paper, oxygen absorption leads to a decrease in the degree of polymerization, color reversion, and a loss in mechanical properties. 

Chapter 11 treats the basic elements of the mechanical properties of polymeric solids and melts. Topics such as fracture mechanics and rheology are touched on... 

Tensile properties are one of the most important single indications of the strength of a material. Mechanical properties of polymeric materials are often measured using standard test sample configurations. In these studies, a tensile dumbbell-shaped test specimen which conforms to ASTM D638 was used for all measurements. 

O Donnell, P.B. McGinity, J.W. Mechanical properties of polymeric films prepared from aqueous polymeric dispersions. In Aqueous Polymeric Coatings for Pharmaceutical Dosage Forms, 2nd Ed. McGinity, J.W., Ed. Marcel Dekker, Inc. New York, 1997 517-548. 

Theodorou, D.N., Suter, U.W. Atomistic modeling of mechanical properties of polymeric glasses, Macromolecules 19, 139-154 (1986)... 

Methods for Determination of Dynamic Mechanical Properties of Polymeric Systems... 

Meinecke, E. A. Clark, R. C. "Mechanical Properties of Polymeric Foams" Technoraic Westport, CT, 1973. 

When we consider the mechanical properties of polymeric materials, and in particular when we design methods of testing them, the parameters most generally considered are stress, strain, and Young s modulus. Stress is defined as the force applied per unit... 

Studies of the dynamic mechanical properties of polymeric objects characterized by the adhesion bond with a solid surface found that the gradient of the segmental mobility and of the indices of the mechanical properties was close to the interphase boundary during withdrawal from the solid surface. 

The physical properties including the mechanical properties of polymeric materials depend on their molecular characteristics, highly ordered structures, fillers, and material morphology. Table 8.1 [8] and Figure 8.9 [125] summarize the physical properties of PLA and other representative commercial polymers. In the following sections, some crucial parameters that significantly alter the mechanical properties are discussed. 

Molecular weight is an important parameter to determine the mechanical properties of polymeric materials and is given by the following empirical equation ... 

A few years later in 1941, Bresler reported the mechanical properties of polymerized monolayers, and introduced the terms 2-D polymerization and 2-D polymer ... 

---