Crystallization of Polymer Mixtures in the Course of Their Solution-Enhanced Dispersion by Supercritical Fluids

摘要

The characteristics of phase equilibria for systems including toluene, supercritical CO2, and ethylene-vinyl acetate copolymers (EVACs) were studied experimentally. Solution enhanced co-dispersion of EVAC and low-density polyethylene mixtures by supercritical fluids (SEDS) was performed under pressures of 8.0-25.0 MPa at 313, 323, and 333 K. The comparison of melting and crystallization in the resulting copolymer mixtures with those in the same-composition mixtures obtained by melt mixing showed SEDS to result in an increase in the degree of crystallinity of the polymer mixtures.