Improvement of the impact strength of ethylene-propylene random copolymers by nucleation

Zsuzsanna Horváth, Alfréd Menyhárd, Petar Doshev, Markus Gahleitner, David Friel, J. Varga, B. Pukánszky

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Five ethylene-propylene random copolymers were nucleated with two soluble nucleating agents. Ethylene content changed between 1.7 and 5.3 wt %, while nucleating agent content was adjusted according to the solubility of the additive. It changed from 0 to 5000 ppm for the sorbitol (1,2,3-tridesoxy-4,6:5,7-bis-O-[(4-propylphenyl) methylene]-nonitol) and from 0 to 500 ppm for the trisamide compound (1,3,5-benzene-trisamide) used. Crystalline structure was analyzed in detail by various methods (DSC, XRD, and SEM). Mechanical properties were characterized by tensile and instrumented impact measurements. The results showed that most properties changed moderately upon nucleation, but impact resistance increased considerably. Spherulitic structure was not detected, but instead in the presence of the soluble nucleating agents used a microcrystalline structure formed. The large increase of impact resistance could not be related directly to changes in crystalline morphology. On the other hand, local rearrangement of morphology was detected by XRD and SEM analysis including an increase of lamella thickness, crystal orientation, and the formation of shish-kebab structures in the core of the injection molded specimens. A small increase in the γ-phase content of PP was also observed. These changes increased crack propagation energy considerably leading to the large improvement observed in impact resistance. Although the phenomenon could be related to ethylene content, differences in molecular weight also helped to explain the changes observed.

Original languageEnglish
Article number43823
JournalJournal of Applied Polymer Science
Volume133
Issue number34
DOIs
Publication statusPublished - Sep 10 2016

Fingerprint

Impact resistance
Impact strength
Propylene
Ethylene
Nucleation
Copolymers
Crystalline materials
Scanning electron microscopy
Sorbitol
Benzene
Crystal orientation
Crack propagation
Solubility
Molecular weight
Mechanical properties
ethylene
propylene

Keywords

  • crystallization
  • polyolefins
  • structure-property relations

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Surfaces, Coatings and Films
  • Chemistry(all)

Cite this

Improvement of the impact strength of ethylene-propylene random copolymers by nucleation. / Horváth, Zsuzsanna; Menyhárd, Alfréd; Doshev, Petar; Gahleitner, Markus; Friel, David; Varga, J.; Pukánszky, B.

In: Journal of Applied Polymer Science, Vol. 133, No. 34, 43823, 10.09.2016.

Research output: Contribution to journalArticle

Horváth, Zsuzsanna ; Menyhárd, Alfréd ; Doshev, Petar ; Gahleitner, Markus ; Friel, David ; Varga, J. ; Pukánszky, B. / Improvement of the impact strength of ethylene-propylene random copolymers by nucleation. In: Journal of Applied Polymer Science. 2016 ; Vol. 133, No. 34.
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