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PhD Thesis Defense Anida Petchkaew

On Thursday, January 15th, 2015, Ms. Anida Petchkaew has defended her thesis entitled 'Implications of Non-carcinogenic PAH-free Extender Oils in Natural Rubber based Tire Compounds’.

Tire compounds are composed of various ingredients such as carbon black, accelerators, activators, antidegradants, sulfur and process oil. The oils are generally added in the compounds to improve processing properties, low temperature properties, dispersion of fillers, and to reduce cost. The conventionally widely used oils in tire compounds are Highly Aromatic (HA) oils, which contain a high concentration of Polycyclic Aromatic Hydrocarbons (PAHs). PAHs that can be released from tires by tire wear are harmful to health and environment, so safe process oils are needed to replace aromatic oil in tire compounds. This thesis comparatively studies the influences of PAH-free petroleum based extender oils, i.e. Treated Distillate Aromatic Extract (TDAE) and Mild Extracted Solvate (MES), versus the conventional aromatic oil on the properties of NR-based truck tire tread compounds and NR/SBR-based passenger tire tread compounds. Oil characterization data are analyzed, and the influence of the oils on the properties of unfilled compounds is also elucidated.