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By Patrick Vermette

The authors of this publication speak about polyurethanes utilized in numerous biomedical functions. Polyurethanes shape a wide kinfolk of polymeric fabrics with a major variety of chemical compositions and homes the big variety of homes that may be completed with polyurethane chemistry has attracted the eye of builders of biomedical units who see promise within the mechanical flexibility of those fabrics mixed with their excessive tear energy.

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In: D Klempner KCF, ed. Polymer Alloys. Plenum Press, 1977:287-296. 15. Briber R, Thomas E. Investigation of two crystal forms in MDI/BDO-based polyurethanes. J Macromol Sci, Phys 1983; B22:509-528. 16. Brostow W, Kubat J, Kubat M. Mechanical properties. In: Mark JE, ed. Physical Properties of Polymers Handbook. New York: AIP Press, 1996:331-332. 17. Wen J, Somorjai G, Lim F et al. XPS study of surface composition of a segmented polyurethane block copolymer modified by PDMS end groups and its blends with phenoxy.

Interest in isocyanates and polyurethanes grew gradually in the United States with the introduction of PU elastomers (1950) and flexible foams (1952) by Bayer. In their early years, polyurethanes were characterized by their good properties but high prices. The arrival of flexible polyurethane foams with high strength and low densities insured large-scale production of PU materials and their precursors. Between 1952-1954, Bayer developed a diisocyanate-polyester flexible foam suitable for the continuous commercial production of Moltopren.

Affrosman S, Barbenel J, Forbes C et al. Surface structure and biocompatibility of polyurethanes. Clinical Materials 1991; 8:25-31. 22. Takahara A, Takahashi K, Kajiyama T. Effect of polyurethane surface chemistry on its lipid sorption behavior. J Biomater Sci Polymer Edn 1993; 5:183-196. Synthesis, Physicochemical and Surface Characteristics of Polyurethanes 21 23. Takahara A, Tashita J, Kajiyama T et al. Microphase separated structure, surface composition and blood compatibility of segmented poly(urethaneureas) with various soft segments components.

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