Property 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... 

Throughout much of the early growth and evolution of polymer science, the quest for new properties was focused primarily on the two traditional architectures that defined thermoplastic (linear) and thermoset (cross-Unked polymers). Within each of these areas, there was intense activity to evaluate and optimize certain critical parameters. These parameters included various macromolecular chemical compositions, copolymer compositions, molecular weight effects, molecular weight distributions, and cross-link... 

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... 

Alkenes resemble alkanes m most of their physical properties The lower molecular weight alkenes through 4 are gases at room temperature and atmospheric pressure The dipole moments of most alkenes are quite small Among the 4 isomers 1 butene cis 2 butene and 2 methylpropene have dipole moments m the 0 3-05 D range trans 2 butene has no dipole moment Nevertheless we can learn some things about alkenes by looking at the effect of substituents on dipole moments... 

We shall be interested in determining the effect of electrolytes of low molecular weight on the osmotic properties of these polymer solutions. To further simplify the discussion, we shall not attempt to formulate the relationships of this section in general terms for electrolytes of different charge types-2 l, 2 2, 3 1, 3 2, and so on-but shall consider the added electrolyte to be of the 1 1 type. We also assume that these electrolytes have no effect on the state of charge of the polymer itself that is, for a polymer such as, say, poly (vinyl pyridine) in aqueous HCl or NaOH, the state of charge would depend on the pH through the water equilibrium and the reaction... 

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