Phase Segregation Behavior in PE/DOP Blends and Glass-Transition Temperatures of Polyethylene

摘要

Phase segregation behavior in Pes/DOP blends, interactions between Pes and DOP, and glass-relaxation transitions of Pes were investigated. FTIR, DSC, and DOP. DMA data demonstrated that pure Pes each (except HDPE) exhibited two loss maxima at about-20 and -120 deg C but the Pes/DOP blends (including the HDPE/DOP blend) yielded one new loss maximum at about-60 deg C. The glass-relaxation transitions corresponding to the three loss maxima on the DMA curves were designated #alpha# (-20 deg C), #beta# (-60 deg C), and #gamma# (-120 deg C) transitions and were attributed to the relaxation of the amorphous phases in the interlamellar, interfibrillar, and interspherulitic regions, respectively, based on DMA, WAXD, SAXS, and POM measurements. The controversial T_g values of PEs and their origin were thus clarified in this study.