Abstract
Two series of polyether polyurethanes, chain extended by ethylene glycol, have been synthesised with rigid exclusion of moisture to avoid side reactions. The polyether molecular weight was varied in each series. The polymers, which have been well characterised, are used to correlate surface properties and biocompatibility. The polyethylene glycol materials showed no significant surface segregation when examined by XPS. The polytetramethylene glycol polymers showed marked surface segregation of soft block. SIMS analysis showed that, even with surface segregation of soft block, some hard block was present at the outermost surface. Contact angle data confirmed that variations in polymer surface structure, with an increase in soft block molecular weight, were also present when the membrane was in an aqueous environment. Biocompatibility tests showed that there were no detectable differences between the polytetramethylene materials, though the surface compositions varied. The polytetramethylene polyurethanes were similar to Biomer in biocompatibility.
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