Toughening mechanisms of rubber toughened PMMA

Mitsugu Todo, Kiyoshi Takahashi, P. Y. Ben Jar, Philippe Béguelin

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Toughening mechanisms of three types of rubber toughened poly (methyl methacrylate) (RT-PMMA) were investigated under mode 1 loading condition by optical and electron microscopies in conjunction with the quantitative evaluation of mode I fracture toughness. Polarizing optical microscopy clearly exhibited damage zone development ahead of a crack-tip in the RT PMMA's. The three RT PMMA's revealed different shapes of the damage zone. Transmission electron microscopy exhibited microcrazes generated in the equator of rubber particles within the damage zones. Extensive deformation of rubber particles corresponding to localized shear yielding of the PMMA matrix was also found in a region close to a propagating cracktip. In addition, cavitation of rubber particles was observed in the vicinity of the crack. It is therefore understood that the toughening of the RT PMMA's is due to energy dissipation caused by the microdamage formations such as microcrazing, matrix shear deformation and rubber particle captation ahead of the crack-tip.

Original languageEnglish
Pages (from-to)585-591
Number of pages7
JournalJSME International Journal, Series A
Issue number4
Publication statusPublished - Oct 1999

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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