Experimentally determined temperature-concentration phase diagrams of monodisperse alkanes with chains containing between 100 and 200 carbons

Monte Carlo simulations of single crystals from polymer solutions

“…It is seen that T m decreases rapidly upon dilution. Similar effects of C on T m have been found experimentally in dilute solutions of low-molecularweight polyethylene, 55 monodisperse alkanes, 56,57 and poly͑decamethylene terephthalte͒. 49 Although Hobbs et al 56 claimed that alkanes above C 198 H 398 exhibit "polymeric"-type behavior, i.e., T m independent on C, the study of Putra and Ungar 57 showed that T m for C 246 H 494 solutions decreases significantly upon dilution.…”

Crystallization Kinetics

“…The well-defined crystallographic shape is typical of solution-grown crystals of many (but not all) polymers, their exact shape depending on the underlying crystallography and the interplay of growth rates of the different crystal faces, which also varies with crystallization temperature (see SEMICRYSTALLINE POLYMERS for more detail on crystal shape). Crystal thickness is typically plotted against the equilibrium dissolution temperature, a temperature that has an ill-defined meaning (68,69), but these plots give a remarkably similar temperature dependence of thickness to that seen for melt crystallization, in the case of polyethylene. Despite technical difficulties, growth rates as a function of temperature can be measured by careful experimentation (70)(71)(72)(73)(74)(75), and can be plotted to give an approximately linear relationship with 1/T T. An example is shown in Figure 9.…”