| Abstract: | Blends of chlorinated polyethylene and an ethylene vinyl acetate copolymer of various compositions were prepared by mixing in the melt state. Dynamic rheological properties of these blends were studied at different temperatures below, near, and above the TS, the temperature of phase separation, and in a frequency range from 0.01 to 100 rad/s. It is shown that the time–temperature superposition principle is suitable in all investigated temperature ranges. G′ versus G″ representations for the blends were found to be independent of temperature and varying weakly with the composition. Changes in the relaxation spectra H(τ) were discovered which depend on the prehistory of the blend preparation and on thermal conditions in the working unit of a rheometer (increasing the temperature from 140 to 180°C or decreasing the temperature from 180 to 140°C). © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1911–1918, 2003 |
