Isotactic polypropylene/hydrogenated oligo (cyclopentadiene) blends: 1. Thermal and dynamic-mechanical behaviour of annealed samples

摘要: Abstract Blends of isotactic polypropylene and hydrogenated oligo (cyclopentadiene) were prepared by melting-mixing in a Brabender-like apparatus. Sheets such blends moulded under pressure, quenched water then annealed for 24 h at 140°C. Wide angle X-ray scattering was used to examine the effect annealing treatment on specimens. Thermal properties analysed using differential scanning calorimeter. Melting points overall crystallinity content decreased linearly up 50% HOCP. Beyond value further decrease observed. Dynamic-mechanical tests performed various frequencies (in range 1 × 10 −2 − 75 Hz) different temperatures (from −40°C 120°C). The two components appeared be compatible amorphous regions system, as already suggested literature. In fact unique peak loss modulus versus temperature (which is representative glass transition temperature), always present. Moreover maximum shifted higher with increasing oligomer content. most interesting feature, however, change shape whole curve. broadened more whereas height increased only slightly percentage increased. A tentative explanation given present paper terms particular features blend morphology, phase inversion high HOCP blends.