Blends of ethylene 1‐octene copolymer synthesized by Ziegler–Natta and metallocene catalysts. I. Thermal and mechanical properties

摘要: The thermal, viscoelastic, and mechanical behaviors of three binary blends ethylene 1-octene copolymer (EOC) regarding the melt index density, one component made by Ziegler–Natta (FA RF in abbreviation commercial name) other metallocene catalysts (FM, EN PL name), have been investigated to understand molecular mechanism blends. Thermal studies reveal that two constituents exclude another during crystallization, implying a phase separation. Viscoelastic properties show single β or γ transition all compositions, suggesting miscibility amorphous region. tensile modulus, yield stress, maximum strength at break, elongation break follow rule mixtures if comonomer content does not differ too much. Otherwise, modulus stress are negatively deviated, whereas is positively deviated from weight-average value. film machine direction increased with an addition FM FA + blend. Although form separate crystals crystalline state, correlation exists between density EOCs. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 1169–1177,