Room Young modulus

Figure 4. Youngs modulus of ESX samples at room temperature as a function of time following a thermal treatment of (a) 170°C, (b) 120°C, (c) 80°C, and (d) 60°C...

Table 5 Young modulus, E, for non-nucleated and / -modified PP and their 15 wt % toughened PP/EPR blends as a function of the strain rate, de/df. Tensile tests performed at room temperature on a base resin exhibiting an MFR of 12 dgmin-1 ...

Fig. 9 shows the flexural Young modulus of our different composites Fig. 10 shows the mechanical dynamical flexural modulus measured at room temperature in the range of 500 c.p.s. in the case of untreated and SIC treated beads. The theoretical curves (continuous lines) were obtained with the parameters Vm = 0.38, Eg =... 

It was later confirmed by Ide and Chung [119] that these observations were also valid for thermotropics. Small-diameter rods of a longitudinal PLC (a copolyester based on 2,6-hydroxynaphthoic acid, terephthalic acid and p-aminophenol) were annealed above its crystal melting temperature in the nematic state for different periods of time. The dependence of the Young modulus at room temperature on the... 

Ume] Mechanical alloying plus spark plasma sintering (synthesis) XRD, metallography, SEM, TEM, DSC (Fe,Mn)3C with Mn to 30% hardness and Young modulus at room temp., dieimal expansion at 20% Mn, 25 to 1027°C, heat capacity at 20% Mn, -100 to 800°C... 

Eor reinforcement, room temperature tensile strength and Young s modulus (stress—strain ratio) are both important. Typical values for refractory fibers are shown in Table 2. 

So ceramics, at room temperature, generally have a very large lattice resistance. The stress required to make dislocations move is a large fraction of Young s modulus typically, around E/30, compared with E/10 or less for the soft metals like copper or... 

The mass fraction crystallinity of molded PHB samples is typically around 60%. As shown in Table 3, PHB resembles isotactic polypropylene (iPP) with respect to melting temperature (175-180°C), Young s modulus (3.5-4 GPa) and the tensile strength (40 MPa). In addition, the crystallinity of iPP is approximately 65% [18]. Accordingly, the fracture behavior of PHB may be anticipated to be tough at room temperature. Molded PHB samples do indeed show ductile behavior, but over a period of several days at ambient conditions, they slowly become more brittle [82, 85, 86]. Consequently, the elongation to break of the ultimate PHB (3-8%) is markedly lower than that of iPP (400%). 

Silicon carbide is a very hard snbstance with a Young s modulus of 424 GPa [1]. It is chemically inert and reacts poorly (if at all) with any known material at room temperature. The only known efficient etch at moderate temperatures is molten KOH at 400-600°C. It is practically impossible to diffuse anything into SiC. Dopants need to be implanted or grown into the material. Eurthermore, it lacks a liqnid phase and instead sublimes at temperatures above 1,800°C. The vapor constituents during sublimation are mainly Si, SqC, and SiC in specific ratios, depending on the temperature. 

Figure 3.3 shows representative stress-strain curves for a variety of polymeric materials. At normal use temperatures, such as room temperature, rigid polymers such as polystyrene (PS) exhibit a rapid increase in stress with increasing strain until sample failure. This behavior is typical of brittle polymers with weak interchain secondary bonding. As shown in the top curve in Figure 3.3, the initial stress-strain relation in such polymers is approximately linear and can be described in terms of Hooke s law, i.e., S = Ee, where E is Young s modulus, typically defined as the slope of the stress-strain plot. At higher stresses, the plot becomes nonlinear. The point at which this occurs is called the proportional limit. 

Fig. 10 Young s modulus for multilayer of PSS/(DADMAC/NMVA) random copolymers as a function of ambient humidity at room temperature. The DADMAC-content of the copolymer is varied between 75 and 100% (75% filled triangles, 89% filled circles, 100% filled squares and filled inverted triangles), indicating a clear dependency of the mechanical properties of the multilayer on the linear charge density. In all cases, a plasticizing effect of water is evident...

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