COMPATIBILITY OF IPP HOCP BINARY BLENDS BY OM, DSC, DMTA AND C-13 NUCLEAR-MAGNETIC-RESONANCE/

The study of miscibility of the isotactic polypropylene (iPP)/hydrogen ated oligo(cyclopentadiene) (HOCP) blends was performed by using OM, D SC, DMTA and C-13 NMR techniques. The proton spin-lattice relaxation t ime in the rotating frame by using C-13 spectra cross-polarization/mag ic-angle spinning (CP/MAS) of iPP, HOCP and their blends were determin ed These blends showed phase separation. Two amorphous phases were obs erved: one rich in the high molecular weight component (iPP) and anoth er one rich in the low molecular weight component (HOCP). This behavio ur was similar to one observed for HDPE/HOCP blends. The results indic ated that compression moulded samples of iPP/HOCP blends formed a part ially miscible system, while in literature it was found that extruded isotropic films of this blend displayed as a miscible system. The iPP- HOCP interaction is influenced by the composition, the crystallization process, the solidification time and the specimen preparation.