Characterization of extractable species from poly(etherurethane urea) (PEUU) elastomers

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Abstract
Methanol extracts of four poly(etherurethane urea) (PEUU) materials were analyzed using Gel Permeation Chromatography (GPC). The additives in the materials were Santowhite® powder at 1 wt% and Methacrol® 2138 F at 5 wt% loading levels. One-to-two wt% of the original PEUU films was extractable with methanol. The extractables consisted of a low molecular weight (Mw) PEUU polymer, an MDI-rich oligomer, the additives Santowhite® (SW) powder and Methacrol® 2138 F, and aniline. The low Mw PEUU polymer had a Mw of 12 000 relative to polystyrene, and the MDI-rich oligomer had a Mw of 1000 relative to polystyrene. Quantitation of all extracted species was achieved using GPC; the use of dual-detectors on the GPC made it possible to determine the soft-to-hard composition of the PEUU extracts as a function of molecular weight.