Relationship between the structure and mechanical properties of polypropylene: Effects of the molecular weight and shear‐induced structure

Claudia Stern; Achim Frick; Günter Weickert

doi:10.1002/app.24156

journal article Oct 23, 2006

Relationship between the structure and mechanical properties of polypropylene: Effects of the molecular weight and shear‐induced structure

Claudia Stern

Achim Frick Günter Weickert

Journal of Applied Polymer Science Vol. 103 No. 1 pp. 519-533 · Wiley

View at Publisher Save 10.1002/app.24156

Abstract

AbstractA series of homopolymer polypropylenes (PPs), within a weight‐average molecular weight (Mw) range of 100–1600 kg/mol, were manufactured as dumbbell microspecimens. The effects of the molecular weight and shear‐induced crystallization on the mechanical properties and morphology were studied to gain a better understanding of the structure–property relationship. The results showed that the crystallinity decreased from 50 to 41% and the lamellar thickness increased as Mw increased. Tensile tests demonstrated that the stiffness and especially the tensile strength rose to extremely high values (Young's modulus = 2400 N/mm2, stress at 30% strain = 120 N/mm2). Furthermore, the strain hardening effect was strongly affected by the lamellar thickness and highly oriented superstructures. Dynamic mechanical analysis demonstrated that the mobility of the molecular chains depended on Mw and on the lamellar thickness. In addition, the viscoelastic properties of unannealed and annealed samples indicated further the existence of shish‐kebab structures caused by shear‐induced crystallization during injection molding. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 519–533, 2007

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Details

Published: Oct 23, 2006
Vol/Issue: 103(1)
Pages: 519-533
License: View

Authors

C

Claudia Stern

German Aerospace Center (DLR)

Cite This Article

Claudia Stern, Achim Frick, Günter Weickert (2006). Relationship between the structure and mechanical properties of polypropylene: Effects of the molecular weight and shear‐induced structure. Journal of Applied Polymer Science, 103(1), 519-533. https://doi.org/10.1002/app.24156

Relationship between the structure and mechanical properties of polypropylene: Effects of the molecular weight and shear‐induced structure

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