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Gel spinning is the industrial method of choice for combining hydrophilicultra-high molecular weight (UHMW) polymer resins with a hydrophobic supportpolymer to produce composite filaments for cytapheresis. Cytapheresis is amedical technique for removal of leukocytes from blood. Gel spinning is used toavoid high melt viscosity and thermal sensitivity of UHMW resins and the highmelt temperature of the substrate resin but requires the recovery of toxicsolvents. The UHMW resin is used because it forms a stable gel phase in thepresence of water; a lower molecular weight resin (LMW) simply dissolves. UHMWand LMW resins were both poly(ethylene oxide) (PEO) and the substrate waspolyarylsulfone (PAS). The literature indicated PEO undergoes non-oxidativethermal degradation above 200 {\deg}C and PAS is processed up to 350 {\deg}C.Dynamic oscillatory shear rheometry was used to study 0, 25, 40, 50, 60, and 75wt. % UHMW PEO in LMW PEO to take advantage of the sensitivity of viscosity tochanges in molecular weight and material configuration, indicating degradation.Samples were exposed to 220 {\deg}C, 230 {\deg}C, 240 {\deg}C, 250 {\deg}C, 275{\deg}C, and 300 {\deg}C temperatures for 5 min to explore conditions thatcould result in sample degradation. The viscosity decreased less withincreasing UHMW PEO content for samples exposed to the same temperature and theviscosity decreased more with increasing exposure temperature for samples withthe same UHMW PEO content. Parameters were regressed from observed data topredict the change in molecular weight via empiricisms relating the viscosityto molecular weight, shear rate, temperature, and time.

The rheology of ultra-high molecular weight poly(ethylene oxide) dispersed in a low molecular weight carrier