Suppression in Melt Viscosity of the Homogeneously Mixed Blends of Polypropylene (iPP-UHMWiPP) in the Presence of an Oxalamide

R. Marroquin-Garcia, N. Leone, L.G.D. Hawke, D. Romano, C.H.R.M. Wilsens, S. Rastogi*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Here we report on the influence of an aliphatic oxalamide-based nucleating agent (OXA3,6) on the viscoelastic and mechanical properties of isotactic polypropylene (iPP) blended with ultrahigh molecular weight iPP (UHMWiPP). The linear viscoelastic properties are investigated by using a plate-plate rheometer; the presence of only 0.5 wt % of OXA3,6 in the iPP-UHMWiPP blends results in a reduction of the complex viscosity in the entire frequency domain examined. This observation holds irrespective of the UHMWiPP weight fraction, up to 25 wt %. The viscosity suppression is attributed to an acceleration of the reorientation times of the chains, especially the longer ones, due to partial alignment of their molecular segments. Furthermore, SAXS measurements on cooled, injection molded samples hint that OXA3,6-containing samples display enhanced alignment under processing conditions (injection molding). Compared to samples without OXA, an increase in the SAXS intensity along the equator is observed in the OXA3,6 samples, implying an enhanced ability of shish-kebab formation. Such a morphological development results in higher yield stress while maintaining the elastic behavior.
Original languageEnglish
Pages (from-to)2574-2587
Number of pages14
JournalMacromolecules
Volume55
Issue number7
Early online date1 Mar 2022
DOIs
Publication statusPublished - 12 Apr 2022

Keywords

  • ENTANGLEMENT MOLECULAR-WEIGHTS
  • ISOTACTIC POLYPROPYLENE
  • MECHANICAL-PROPERTIES
  • CONSTITUTIVE MODEL
  • PLATEAU MODULI
  • SHEAR
  • POLYETHYLENE
  • COMPOSITES
  • POLYMERS
  • CARBON

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