A lattice treatment of crystalline solvent-amorphous polymer mixtures on melting point depression

On the interfacial energy of extended-chain crystals from polyethylene melt by revised Flory equations of fusion

“…This level is also very good agreement with the Flory value range culated from the equilibrium relations eqs. (10) and (11) are also very consistent to those from 14.6 { 2.1 kJ/mol. Plots of T me as a function of v (at T c ) are given the corresponding Flory equations, using the same experimental data presented by Stack et al 5 in Figure 2 for the different values of s e , using z Å 394 and x Å 400.…”

“…The curves calculated by the Generally when experimental data become constant with time during isothermal crystallization, use of eqs. (10) and (11) can predict the values of s e for the fraction when T me and v and z are they can be considered to be the equilibrium data and be applicable to the equations for equilibrium known. Thus, it is shown that the equilibrium melting trend is similar to the nonequilibrium melting, as has been done in the past.…”

“…Also, although this analysis is initially focused on low molecular weights, it may new model is a result that a lattice theory of fusion for low-molecular crystals in amorphous polybe expanded to describe EC formation of higher molecular weights. mers, presented by Hoei et al, 11 has been applied, in contrast to a case of crystalline polymers in The synthesis of high molecular weight n-alkanes have recently been developed, which can solvent. Consequently, this approach will satisfactorily explain the above experimental situation form EC molecular crystals wherein the end groups are paired, due to their exactly uniform and will also be reliably applied to other EC polyethylene systems.…”

“…of a repeating unit, respectively; f 0 and f are the volume fractions of the solvent and of the polymer, Equation (2) is statistically and physically similar to that considered previously in consideration respectively; h u and s u are the heat of fusion and entropy of fusion per repeating unit, respectively; of crystalline solvent in amorphous polymer mixtures on the EC molecular crystal. 11 Because the D is Flory's parameter associated with the interfacial free energy (s ec ) of the crystallite end, defined m chains are assumed to be the same as the total number of polymer segments on the interface of as ln D Å 02s ec /RT; and x is the interaction parameter relating to the heat of mixing between a the crystallite end, the ratio m/Nx may be regarded as surface crystallinity. Thus, the degree repeating unit and solvent molecule.…”

Optimising Drug Solubilisation in Amorphous Polymer Dispersions: Rational Selection of Hot-melt Extrusion Processing Parameters

“…In addition, the extended Flory expression of the theory of melting point depression allows the calculation of the F-H interaction parameter χ at varying drug fractions (21,(24)(25)(26):…”