Abstract
ABSTRACT Process oils make important contributions to nearly every compound in a tire, and oil–polymer interactions have effects on compound processing and performance. One way to predict oil–polymer interactions is to determine the three-dimensional (3-D) Hansen solubility parameters (HSPs) for both oil and polymer, and the polymer solubility sphere (PSS) radius. Favorable oil–polymer interactions occur when an oil's HSPs are located within a PSS. Interactions are stronger when an oil's HSPs are located closer to the center of the PSS. If an oil's HSPs are located outside a polymer's solubility sphere, then the polymer is not soluble in the oil as a result of insufficient favorable interactions. A polymer characterization technique for determining the HSPs is the bitumen solubility model. However, no simple procedure has previously been documented for estimating the 3-D HSPs for an oil. A labor-intensive method has been described by Levin and Redelius. The oil solubility parameters estimation procedure (OSPEP) has been developed to meet the need for a relatively simple characterization technique. This procedure can provide an estimation of oil HSPs by running two titrations and a dynamic scanning calorimetry test. Analysis involves an iterative procedure to estimate the three HSPs for the oil. OSPEP represents a step forward to easily obtain insight into oil–polymer interactions.
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