The Fracture and Fatigue Behaviour of Nano-Modified SAN

Abstract:

An amorphous styrene-acrylonitrile (SAN) copolymer has been modified by various concentrations of metal oxide (MeO) nano-particles up to 0.50 vol.%. Atomic force microscopy of the modified thermoplastics showed that the nano-particles were well dispersed in the matrix. The incorporation of the nano-particles had a marginal effect on the glass transition temperature and yield stress. However, the Young’s modulus increased with the volume fraction of the nano-particles. The fracture and fatigue properties also had a marked increase with the addition of the nano-particles. The fracture energy was increased from 316±10 J/m2 to 445±27 J/m2, and the maximum fracture energy threshold was increased from 17±1 J/m2 to 34±2 J/m2 at 23 °C. Scanning electron microscopy (SEM) studies showed that debonding of nano-partilces, subesequent plastic void growth and large scale fibril deformation initiated by mulitiple crazing were observed in the process zone of the nano-modified composites.

• Periodical: Advanced Materials Research (Volumes 118-120)
• Pages: 43-48
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.118-120.43
• Online since: June 2010
• Authors: Kou Cheng Zuo, Bamber Blackman, J. Gordon Williams, Helmut Steininger
• Keywords: Fatigue, Fracture, Nanocomposite, Toughness

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