Elastomers gasoline mixtures

Effects of Ethanol/ Gasoline and Methyl Z-Butyl Ether/Gasoline Mixtures on Elastomers... 

The presence of a higher aromatic content In the gasoline resulted In Increased swell and hence Increased deterioration of tensile properties of elastomers exposed to the gasoline and Its mixtures. Addition of benzene to Increase the aromatic content resulted In slightly more detrimental effects on nitrile elastomers than the addition of toluene. The data on all elastomers can be explained In terms of the solubility parameter concept. 

For most elastomers the ultimate tensile and elongation values were found to be quantitatively related by simple linear equations to the volume fraction of the rubber swelled In mixtures of gasoline and ethanol or MTBE. They were also found to be related to each other by simple logarithmic relatlonshlps. 

Methanol, ethanol, and methy t-butyl ether (MTBE) are blended Into some commercial gasolines. It was Important to determine the effects of such blends on automotive elastomers especially those used In the fuel system. A summary of the results of our studies [1] and detailed data on the effects of methanol/gasollne mixtures on sixteen elastomers [2] have already been published. This paper presents detailed results of our Investigation of the effects of ethanol and MTBE mixtures with gasoline on mechanical and swell properties of automotive elastomers. Comparisons will be made with the effects of methanol/gasollne mixtures on elastomers. Experimental... 

---