Instrumented tensile and falling weight impact response of injection-molded α- and β-phase polypropylene homopolymers with various melt flow indices

J. Karger-Kocsis, D. E. Mouzakis, G. W. Ehrenstein, J. Varga

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51 Citations (Scopus)

Abstract

In this study the instrumented tensile (ITI) and falling weight impact (IFWI) behavior of injection-molded α- and β-phase polypropylene (PP) homopolymers were compared at ambient temperature in a broad melt flow index (MFI = 0.7-13 dg/min) range. It was found that the toughness of β-PP is superior to the α-PP: the difference between them increased with decreasing MFI or increasing molecular weight (MW). As expected, the injection molding induced skin layer thickness increased with increasing MW. Effects of the skin-core morphology were deduced indirectly by considering the results achieved on specimens molded at low and high injection speeds (vinj = 6 and 150 mm/s), respectively. It was found that the effect of the skin-core structure is markedly stronger under uniaxial in-plane (i.e., ITI) than in biaxial out-of-plane type loading (i.e., IFWI).

Original languageEnglish
Pages (from-to)1205-1214
Number of pages10
JournalJournal of Applied Polymer Science
Volume73
Issue number7
DOIs
Publication statusPublished - 1999

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Polypropylenes
Homopolymerization
Skin
Molecular weight
Injection molding
Toughness
Temperature

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

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title = "Instrumented tensile and falling weight impact response of injection-molded α- and β-phase polypropylene homopolymers with various melt flow indices",
abstract = "In this study the instrumented tensile (ITI) and falling weight impact (IFWI) behavior of injection-molded α- and β-phase polypropylene (PP) homopolymers were compared at ambient temperature in a broad melt flow index (MFI = 0.7-13 dg/min) range. It was found that the toughness of β-PP is superior to the α-PP: the difference between them increased with decreasing MFI or increasing molecular weight (MW). As expected, the injection molding induced skin layer thickness increased with increasing MW. Effects of the skin-core morphology were deduced indirectly by considering the results achieved on specimens molded at low and high injection speeds (vinj = 6 and 150 mm/s), respectively. It was found that the effect of the skin-core structure is markedly stronger under uniaxial in-plane (i.e., ITI) than in biaxial out-of-plane type loading (i.e., IFWI).",
author = "J. Karger-Kocsis and Mouzakis, {D. E.} and Ehrenstein, {G. W.} and J. Varga",
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T1 - Instrumented tensile and falling weight impact response of injection-molded α- and β-phase polypropylene homopolymers with various melt flow indices

AU - Karger-Kocsis, J.

AU - Mouzakis, D. E.

AU - Ehrenstein, G. W.

AU - Varga, J.

PY - 1999

Y1 - 1999

N2 - In this study the instrumented tensile (ITI) and falling weight impact (IFWI) behavior of injection-molded α- and β-phase polypropylene (PP) homopolymers were compared at ambient temperature in a broad melt flow index (MFI = 0.7-13 dg/min) range. It was found that the toughness of β-PP is superior to the α-PP: the difference between them increased with decreasing MFI or increasing molecular weight (MW). As expected, the injection molding induced skin layer thickness increased with increasing MW. Effects of the skin-core morphology were deduced indirectly by considering the results achieved on specimens molded at low and high injection speeds (vinj = 6 and 150 mm/s), respectively. It was found that the effect of the skin-core structure is markedly stronger under uniaxial in-plane (i.e., ITI) than in biaxial out-of-plane type loading (i.e., IFWI).

AB - In this study the instrumented tensile (ITI) and falling weight impact (IFWI) behavior of injection-molded α- and β-phase polypropylene (PP) homopolymers were compared at ambient temperature in a broad melt flow index (MFI = 0.7-13 dg/min) range. It was found that the toughness of β-PP is superior to the α-PP: the difference between them increased with decreasing MFI or increasing molecular weight (MW). As expected, the injection molding induced skin layer thickness increased with increasing MW. Effects of the skin-core morphology were deduced indirectly by considering the results achieved on specimens molded at low and high injection speeds (vinj = 6 and 150 mm/s), respectively. It was found that the effect of the skin-core structure is markedly stronger under uniaxial in-plane (i.e., ITI) than in biaxial out-of-plane type loading (i.e., IFWI).

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