Cast Poly Ester Urethanes

In this work, MDI-terminated polyester prepolymer based on ethylene adipate polyol (Baytec MS-242) was used to prepare cast poly(ester urethane) materials. The HER-TG materials, HER-HP and HQEE were used as chain extenders. As discussed in section 8.4, technical grade HER materials contain various levels of high MW diols as reactive impurities. Therefore, as with poly(ether urethanes), the high MW diols are expected to play a major role in the performance of poly(ester urethanes) made with these materials. 

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The protocol outlined by the American Society for Testing Materials (ASTM) was followed for the solid surface growth studies. A film of the polymer was cast on the surface of a BMS-agar plate by spreading 2.0 ml of 10 mg/ml poly(ester-urethane) in THF over the surface of the plate and evaporating the THF. The centers of the plates were inoculated with 0.1 ml of the spore suspensions or 0.1 ml of a turbid culture of yeast grown on 0.2% (w/v) Casamino Acids (Difco, Detroit, Ml), after which the plates were incubated at 25 C for one month. 

Interpol . [Freeman] Unsaturt poly-ester/urethane hybrid system for liq. ity. molding or open casting q>plics. 

Methods used for preparing of poly(ester urethane)-urea scaffolds are electro-spinning, solvent casting/salt leaching, phase inversion, laser excimer, and thermally induced phase separation. Electrospun poly (ester urethane)-ureas are elastomeric and the synthesis method allows control of fiber diameter, porosity, and degradation rate. All these properties aid in the development of soft tissue scaffolds. However, electro-spinning produces fibers with unacceptably small pore sizes. Thermally induced phase... 

Uses Soft segment in formation of elastomers such as thermoplastic urethanes, polyether esters, polyether amides, coatings, adhesives and sealants, casting resins, and urethane foams Features Produces elastomeric end-prods, with hydrolytic stability, resist. to microbial attack, low temp, flexibility and elasticity Properties APHA 40 max. wax-like solid sol. in most org. solvs. barely sol. in water m.w. 650 sp.gr. 0.977 (40 C) acid no. 0.05 hyd. no. 166.2-179.5 flash pt. 215 C 0.025% water Storage Hygroscopic protect from moisture and air dry nitrogen blanket should be applied to open containers before resealing Polythix M [Poly-Resyn]... 

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