Blends of isotactic polypropylene (PP) and linear low density polyethylene (LLDPE) have been analysed by thermal analysis and wide-angle X-ray scattering to determine the effect of thermal history on morphology and mechanical behaviour. The blends were quenched directly from the melt, slow cooled and annealed at 130°C. In all cases it was observed that the two components were insoluble and the crystallization behaviour was determined by the blend morphology, particularly in dispersed PP domains in which heterogeneous nucleation was the rate determining step. Slow cooled specimens with the higher degree of crystallinity had the highest yield stresses, and the lowest elongation to break was achieved in the vicinity of 50% blends, characteristic of the effect of blend morphology on properties
Посилання на статтю:
Structure-property relationships in annealed blends of linear low density polyethylene with isotactic polypropylene / Xiao-Qi Zhou and J. N. Hay // Polymer. – 1993. – Vol 34. – P. 4710-4716.