Real-time morphological observation of isotactic polypropylene and poly(ethylene-co-octene) rubber blend during temperature change

Michio Ono, Ken Nakajima, Mayumi Misawa, Toshio Nishi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In the injection- and compression-molded specimens composed of isotactic polypropylene (iPP) and poly(ethylene-co-octene) rubber (EOR) blend, its morphological changes with temperature variation were investigated using an atomic force microscopy equipped with a heater accessory. Phase-separated sea-island structures comprising the iPP matrix (sea) and the EOR domains (island) were clearly observed in both specimens. In the injection-molded specimen, the morphology of the EOR domains was fibrous along flow direction (FD). In the iPP matrix, a stripelike structure consisting of alternating iPP crystalline lamellae and amorphous region was clearly observed at room temperature. As increasing temperatures, the iPP amorphous regions seemed to shrink gradually and could not be identified at 80°C. By contrast, in the compression-molded specimen, the EOR domains were circular in shape, and the alternate structure comprising the iPP crystal lamellae and amorphous regions was also found. At elevated temperatures, the iPP amorphous regions gradually enlarged. The analysis of the apparent activation energy obtained by a dynamic mechanical thermal analysis revealed that the differences in the morphological behavior in the iPP matrix region between the both specimens were attributed to the differences in the mobility in the iPP crystal regions.

Original languageEnglish
Pages (from-to)1857-1864
Number of pages8
JournalJournal of Applied Polymer Science
Volume108
Issue number3
DOIs
Publication statusPublished - 2008 Mar 5
Externally publishedYes

Keywords

  • Atomic force microscopy (AFM)
  • Injection molding
  • Polypropylene (PP)

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Real-time morphological observation of isotactic polypropylene and poly(ethylene-co-octene) rubber blend during temperature change'. Together they form a unique fingerprint.

Cite this