Toughening mechanism of PP with bimodal distributed SEBS particle size

Hiroyuki Mae, Masaki Omiya, Kikuo Kishimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

The objective is to summarize the material ductility and the toughening mechanisms of the thermoplastic polypropylene blended with two different styrene-ethylene-butadiene-styrene tri-block copolymer (SEBS) at the intermediate and high strain rates. PP and two types of SEBS were blended so that the total rubber amounts were 10, 20 and 30 wt % against PP by the two-step blending procedure. Tensile tests are conducted at the nominal strain rates from 3 × 10-1 to 102 s-1. Phase morphology is investigated to estimate the bi-modal rubber particle size distribution. In addition, the fracture surfaces were observed by scanning electron microscopy (SEM) in order to understand the difference of the toughening mechanism for PP toughened with the bimodal rubber particle size distribution in PP and SEBS blends at various total rubber contents. The large material ductility is obtained in the fracture mechanism of craze bands. The craze bands are obtained in the blend whose total SEBS content is larger than 20 wt%. In addition, the weight ratio of small SEBS particles against total SEBS particles is larger than 20 % and the inter-particle distance of large SEBS particles ranging between 100 and 300 nm are additional condition for crazes bands. The synergistic effect of these rubber particles gives rise to a strong increase in the ductility of these bimodal rubber-particle distributed polypropylene systems.

Original languageEnglish
Title of host publicationSociety for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008
Pages233-239
Number of pages7
Publication statusPublished - 2008 Dec 22
Event11th International Congress and Exhibition on Experimental and Applied Mechanics 2008 - Orlando, FL, United States
Duration: 2008 Jun 22008 Jun 5

Publication series

NameSociety for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008
Volume1

Other

Other11th International Congress and Exhibition on Experimental and Applied Mechanics 2008
CountryUnited States
CityOrlando, FL
Period08/6/208/6/5

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Fingerprint Dive into the research topics of 'Toughening mechanism of PP with bimodal distributed SEBS particle size'. Together they form a unique fingerprint.

Cite this