Tensile, fracture and thermal properties of polyarylates at room and cryogenic temperatures

✍ Scribed by K. Humer; E.K. Tschegg; H.W. Weber

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 664 KB
• Volume: 33
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(93)90020-o

✦ Synopsis

In the present paper, measurements of the modulus of elasticity, the ultimate tensile strength (UTS) and the ultimate tensile strain of polyarylates (ISARYL 1 5X and ISARYL 25X) carried out at room temperature, 77 and 4.2 K are reported on. In addition, the fracture behaviour in mode I on cylindrical circumferentially sharp notched samples as well as the thermal expansion have been investigated. The results show an increase in both the modulus of elasticity and the UTS by about a factor of two on decreasing the temperature to 77 K. Further cooling to 4.2 K leads to a decrease of = 10% in these properties. On the other hand, the ultimate tensile strain of ISARYL 1 5X decreases by = 65% at 4.2 K, whereas a non-uniform temperature dependence is found for ISARYL 25X. The fracture toughness of both materials increases by about a factor of three upon decreasing the temperature to 77 K, but decreases by a factor of two at lower temperatures. These results are discussed in conjunction with additional observations of the fracture behaviour made with optical and scanning electron microscopes.