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    Thromboresistance of Polyurethanes Modified with PEO-Silane Amphiphiles

    Year: 2020

    Journal: Macromol. Biosci., Volume 20, DEC

    Authors: Ngo, Bryan Khai D.; Lim, Kendrick K.; Johnson, Jessica C.; Jain, Abhishek; Grunlan, Melissa A.

    Organizations: National Science Foundation Engineering Research Center for Precise Advanced Technologies and Health Systems for Underserved Populations (PATHS-UP) [1648451]; Texas A&M Engineering Experiment Station (TEES)

    Keywords: antifouling; poly(ethylene oxide) (PEO); polyurethane; surface-modifying additives (SMA); whole human blood

    Surface-induced thrombosis is problematic in blood-contacting devices composed of silicones or polyurethanes (PUs). Poly(ethylene oxide)-silane amphiphiles (PEO-SA) are previously shown effective as surface modifying additives (SMAs) in silicones for enhanced thromboresistance. This study investigates PEO-SAs as SMAs in a PU at various concentrations: 5, 10, 25, 50, and 100 mu mol g(-1)PU. PEO-SA modified PUs are evaluated for their mechanical properties, water-driven surface restructuring, and adhesion resistance against a human fibrinogen (HF) solution as well as whole human blood. Stability is assessed by monitoring hydrophilicity, water uptake, and mass loss following air- or aqueous-conditioning. PEO-SA modified PUs do not demonstrate plasticization, as evidenced by minimal changes in glass transition temperature, modulus, tensile strength, and percent strain at break. These also show a concentration-dependent increase in hydrophilicity that is sustained following air- and aqueous-conditioning for concentrations >= 25 mu mol g(-1). Additionally, water uptake and mass loss are minimal at all concentrations. Although protein resistance is not enhanced versus an HF solution, PEO-SA modified PUs have significantly reduced protein adsorption and platelet adhesion from human blood at concentrations >= 10 mu mol g(-1). Overall, this study demonstrates the versatility of PEO-SAs as SMAs in PU, which leads to enhanced and sustained hydrophilicity as well as thromboresistance.
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