Poly tensile strength data

The comparative effect of the polystyrene and poly-2,6-dichlorosty-rene fillers on the tensile strength of a polybutadiene vulcanizate is shown in Figure 6. Despite the large difference in Tg values for these fillers, there is no difference in their effect on the vulcanizate. This is illustrated further by the failure envelope plot shown in Figure 7, where the data points for the two fillers, at equal volume fraction, appear to coincide quite well. The fact that all the points fall on the same envelope is a good indication of the constant crosslink density for these vulcanizates. Thus, the similarity in effect of these two fillers appears to be more related to their similar modulus values. 

Figure 10.7 shows that the tensile strength is improved as polystyrene is incorporated. Data for conventional melt-blended samples (Fayt et al., 1989) are provided for comparison. We note that the ductile-to-brittle transition for our system is shifted toward much higher polystyrene content. Fayt and others have shown that conventionally prepared polyethylene/ polystyrene blends are relatively poor materials (Barentsen and Heikens, 1973 Wycisk et al., 1990). Blends of most compositions are weaker than polystyrene or polyethylene homopolymers because of the poor interfacial adhesion between the two immiscible polymers. The electron micrographs and the mechanical data for the blends described here indicate that poly-... 

Fig. 3. Effects of graft content and temperature of pol3nnerization of starch- -poly(methyl acrylate) on its ultimate tensile strength at 5 cm/min strain rate. Dennenberg s data is from samples containing homopol3aner and polymerized over the temperature range 27-40°C other data is for homopolymer-free materials pol3nnerized at the specified temperatures.

Figure 7. Mechanical properties (Young s modulus and tensile strength) versus solution concentration of poly(l,4-phenylene terephthalamide) (in sulfuric acid) in the "spin-dope". In the fiber spinning process, the draw down ratio was increased to maintain constant filament diameter at increased concentration. Also indicated is the isotropic/anisotropic phase boundary. Note the absence of any discontinuity at the transition. The inherent viscosity of the polymer was 4.2 dl/g. Data from taken from Weyland (16).

Figure 9.7 Experimental data figures reproduced from the publication of TsujE with permission via the Copyright Clearance Centre. Tensile strength (a) and Young s modulus (b) versus degradation time for various polymer compositions poly(L-lactide) filled triangles, poly(D-lactide) , copolymer poly(DL-lactide) 0, and blend polymer poly(L/D-lactide) o.

FIGURE 12.6 Effect of antioxidant (polymerized trimethyldihydroqninoline) on tensile strength of poly(vinyl ethyl ether). Abscissa is square root of time. (Data from Rodriguez, R, and S. R. Lynch, Ind. Eng. Chem. Prod. Res. Develop., 1, 206, 1962.)... 

Tensile and in vitro and breaking strength retention data of typical monofilament sutures made of the polymers described in Section 8.3.2 are summarized in Table 8.6. The data in Table 8.6 indicate that the polymers described in Table 8.5 can be converted to monofilament sutures with competitive strength retention and breaking strength profiles as the commercially available braided sutures made of polyglycolide or 90/10 poly(glycolide-co-/-lactide). 

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