Pressure and temperature dependence of the melt segmental dynamics of cis-1,4-polyisoprene via time resolved optical spectroscopy

摘要: The local segmental dynamics of melt anthracene-labeled cis-1,4-polyisoprene have been studied as a function temperature (318–333 K) and pressure (0.1–140 MPa). Activation volumes for the motions range from 24 to 39 cm3 mol−1 are observed be dependent, decreasing with increasing temperature. energies at constant 32 75 kJ mol−1 significantly pressure. These activation decomposed series pressures temperatures into term arising energy required execute volume (i.e., energy) describing create needed free motions. Values compared where nearly same density is reached either via combination high or lower t...