Compounding and injection molding of polybutene-1/polypropylene blends

Kalay, Gürhan and Kalay, C. R. (2003) Compounding and injection molding of polybutene-1/polypropylene blends. Journal of Applied Polymer Science, 88 (3). pp. 806-813. ISSN 0021-8995

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The effect of shear-controlled orientation injection molding (SCORIM) was investigated for polybutene-1/polypropylene blends. This article reports on the methods and processing conditions used for blending and injection molding. The properties of SCORIM moldings are compared with those of conventional moldings. SCORIM is based on the application of specific macroscopic shears to a solidifying melt. The multiple shear action enhances molecular alignment. The moldings were investigated with mechanical tests, differential scanning calorimetry studies, and polarized light microscopy. The application of SCORIM improved Young's modulus and the ultimate tensile strength. The gain in stiffness was greater for higher polybutene-1 content blends. A drastic decrease in the strain at break and toughness was observed in SCORIM moldings. The enhanced molecular orientation of SCORIM moldings resulted in a featureless appearance of the morphology. Interfacial features due to segregation were visible in the micrographs of SCORIM moldings. Both conventional and SCORIM moldings exhibited form I' in polybutene-1. This article explains the relationship between the mechanical properties and micromorphologies.
Item Type: Article
Uncontrolled Keywords: poly(propylene) (PP); blends; injection molding; mechanical properties; structure-property relations
Subjects: Q Science > QC Physics > QC1 General
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: Gürhan Kalay
Date Deposited: 23 Jun 2010 15:35
Last Modified: 25 Jul 2019 10:22

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