TY - JOUR A2 - Fornari, Tiziana AU - Ruhl, Oliver AU - Luft, Gerhard AU - Brant, Patrick AU - Shutt, John Richard PY - 2011 DA - 2011/11/02 TI - Phase Behaviour of the System Propene/Polypropene at High Pressure SP - 282354 VL - 2011 AB - The phase behaviour of mixtures of supercritical propene and a number of polypropenes, which have a similar density but significantly different molecular weights and tacticities, was investigated in a broad range of polymer weight fractions and temperatures at high pressures. The cloud-point pressures were measured optically, using a view cell which was equipped with two windows made of synthetic sapphire and a metal bellows to accurately adjust the pressure. The cloud-point pressures were found in the range from 29 to 37 MPa decreasing with increasing polymer weight fraction and increasing with increasing temperature and polymer molecular weight. The critical weight fraction was found below 2 to 6 wt.-%. Whereas the cloud-point pressures of atactic and syndiotactic samples were high and very similar, the isotactic species exhibit distinctly lower values. The results, extrapolated to lower temperatures, show good agreement with the literature data. SN - 1687-9244 UR - https://doi.org/10.1155/2011/282354 DO - 10.1155/2011/282354 JF - Journal of Thermodynamics PB - Hindawi Publishing Corporation KW - ER -