Effects of palm oil fatty acid on curing characteristics, reversion and fatigue life of various natural rubber compounds

✍ Scribed by Ismail, Hanafi; Anuar, H; Tsukahara, Y

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 358 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199907)48:7<607::aid-pi176>3.0.co;2-l

✦ Synopsis

The effects of palm oil fatty acid concentration (0, 1, 3, 5, 7 phr) and epoxidation on curing characteristics, reversion and fatigue life of carbon black ®lled natural rubber compounds have been studied. Three different types of natural rubber, SMR L, ENR 25 and ENR 50 having 0, 25 and 50 mol% of epoxidation and conventional sulphur vulcanization were used. The cure time t 90 , scorch time t 2 , M HR À M L (maximum torque À minimum torque) and fatigue life of all rubbers were found to increase with increasing palm oil fatty acid concentration. However, the reversion of all rubbers decreases with increasing palm oil fatty acid concentration. At similar concentrations of palm oil fatty acid, ENR 50 compounds exhibit the shortest scorch and cure times followed by ENR 25 and SMR L compounds. For reversion, SMR L compounds show the lowest value followed by ENR 50 and ENR 25 compounds, whereas for fatigue life, the highest value is obtained with ENR 50 compounds followed by ENR 25 and SMR L compounds.