The fracture properties of glass polyalkenoate cements as a function of cement age

✍ Scribed by R. G. Hill

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 748 KB
• Volume: 28
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00353190

✦ Synopsis

The fracture properties of two glass polyalkenoate cements based on a short chain-length and on a long chain-length poly(acrylic acid) have been studied as a function of the cement age.

The stress intensity factor, K~, increases with cement age for both cements. The un-notched fracture strength ~f increases with cement age, largely as a result of an increase in the Young's modulus accompanying crosslinking of the polyacrylate chains by metallic ions. The toughness G~ remains approximately constant for the short chain-length cement, but reduces with cement age for the long chain-length cement. Analysis of the toughness data using a chain pull-out model leads to the conclusion that chains distant from the fracture plane are involved in fracture, and that the number of chains that take part in chain pull-out decreases as the crack opening displacement reduces with cement age.