Mechanical properties molecular weight effect

SSE at 240°C / mechanical properties / ductile-brittle transition temperatures / DMA / tensile dilatometry / SEM / TEM / effects of PP and PA molecular weight / effects of adding PP-MA TSE at 245°C / DSC / SEM / mechanical properties... 

PA-6/HDPE/EPDM/ EPDM-g-MA Mechanical properties/morphology/DSC/effect of EPDM molecular weight Zhou et al. 2013... 

PA-6 (100-0)/EP-g-MA(l.l % MA) (0-20)/PP (0-100) SSE at 240 °C/mechanical properties/ductile-brittle transition temperatures/DMA/tensile dilatometry/SEM/TEM/effects of PP and PA molecular weight/ effects of adding PP-MA Gonzalez-Montiel et al. 1995a, b, c... 

GENERAL MECHANICAL PROPERTIES AND MOLECULAR WEIGHT EFFECT... 

FIGURE 2.8 Tensile moduli (relative to bulk value) for various nanocomposites (a) polyamide-6/MMT nanocomposites, with low-, medium-, and high- molecular weight polyamide-6 matrix, as an example of high improvement in mechanical properties due to effective stress transfer from polymer to filler (b) polyurethane and polyurethane copol3mers/MMT nanocomposites, as an example of high improvement in mechanical... 

Table 2. Effects of Molecular Weight and Branching on Mechanical Properties of Polyethylenes...

Table 10.2 Effect of molecular weight and density (branching) on some mechanical and thermal properties of polyethylene...

The properties of PVC may also he expected to depend on the molecular weight distribu n. Most commercial polymers, however, appear to have similar values for MJM and in any case there is little published information on effects of altering the parameter. It is perhaps rather surprising that there appears to be little work reported on the effect of blends of polymers of differing molecular weight on mechanical and rheological properties. 

It will be observed that molecular weight has little effect on mechanical properties but does influence the flow temperature. 

The molecular weight of the copolymer (PE-b-PI) has a profound influence on the mechanical properties of these blends (NR-LLDPE) (Fig. 9). High-molecular weight copolymer is a more effective compatibilizer compared with a low-molecular weight one. 

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