Effect of fibrillar morphology on elastomer-modified polypropylene

✍ Scribed by Zhang Ling; Huang Rui; Li Liangbin; Wang Gang

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 409 KB
• Volume: 83
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.2314

✦ Synopsis

Abstract

Blends of polypropylene (PP) with a copolymer of ethylene and octene (EOC) were studied. The effect of viscosity ratio of elastomer domains to the matrix PP η~d~/η~m~ (where subscript d and m designate dispersed phase and matrix, respectively) on fibril formation was investigated. Fibril morphology was observed for both η~d~/η~m~ ≈ 1 and η~d~/η~m~ > 1 (η~d~/η~m~ = 1.70 or 2.40). As the viscosity ratio increased further, the spherical, elliptical, and rodlike morphology appeared. Fibril formation at η~d~/η~m~ > 1 is possibly attributed to the effect of the interface interaction between the two phases. With soft fibril formation of EOC in PP, mechanical properties of the blends such as tensile and flexural properties were not improved and the impact strength was low compared to those of blends with spherical, elliptical, and rodlike dispersed morphology. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1870–1874, 2002