Phase equilibrium in low-density polyethylene — Normal alkanes systems

Abstract

The crystalline equilibrium diagrams were obtained for eight LDPE--n-alkane systems with the cloud point method. A point of view was formulated in which there is a major difference between crystal separation in lowmolecular-weight systems and systems containing flexible macromolecules, and it derives from differences in the essence of the phase transitions that take place in these systems.

Phase equilibrium of a semicrystalline polymer-liquid system: Isotactic polypropylene-dibutylphthalate

“…The results of the study of the systems of LDPE and alkyl benzenes [27] and LDPE and n alkanes [28] are consistent with this conclusion and show that the dif ference between these temperatures increases with an increase in the low molecular mass component in the system.…”

Phase equilibria and phase structures of polymer blends

“…Generally, liquidus curves for polymer ± solvent systems obtained by different researchers by various experimental methods are identical or close to each other, 77,78 the melting point depressions being in satisfactory quantitative agreement in a broad composition range for a homologous series of solvents (Fig. 21), 79 whereas there is no quantitative agreement between the melting point depressions for polymer ± polymer systems even if extrapolations to the equilibrium melting temperatures are used. 24, 80 ± 82 Unfortunately, the preliminary experimental data on liquidus curves rather than equilibrium melting temperatures were reported in most studies.…”