Correlation between stress-whitening and fracture toughness in rubber-modified epoxies

✍ Scribed by Ho Sung Kim; Pyo Ma

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 469 KB
• Volume: 61
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960725)61:4<659::aid-app9>3.0.co;2-k

✦ Synopsis

Fracture toughness of rubber modified epoxy systems was evaluated in relation to stresswhitening. The epoxy systems consisted of diglycidyl ethers of bisphenol A (DGEBA)based epoxy resin, 4,4' diaminodiphenyl sulphone (DDS) as curing agent, and carboxylterminated butadiene-acrylonitrile (CTBN) rubber. It was found that a peak value of fracture toughness occurs a t a small amount of rubber content (-4 phr) and closely corresponds to that of stress-whitening size. Other properties such as flexural strength and flexural modulus were also found to display maxima a t a similar amount of rubber content. 0 1996 John Wiley & Sons, Inc.